Allied Power Solutions
Allied Power Solutions
Patparganj, New Delhi, Delhi
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Surge Protection Device

We are among the celebrated names in the industry, making available a wide gamut of Surge Protection Devices to our priceless customers. These devices provide optimum protection from the ill effects of voltage fluctuations and have been designed in strict compliance with industry standards. This range includes SPD Surge Protectors, SPD Surge Protector Devices and SPD Single Phase Protectors.
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SPD Single Phase Protector
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Approx.
Rs 1,700
Per Unit

SPD Single Phase Protector

Product Details:
BrandHakel
ClassA, B, C
Number Of Poles2.0, 4.0
We are engaged in providing SPD Single Phase Protector TYPE 2 / CLASS II / CLASS C Surge ArresterSurge Protector, manufactured by following the industry standards and norms. Widely appreciated for its high level of protection, efficiency, and reliable performance, these single phase surge protectors are vastly used for protecting electrical devices such as computers, TVs, and other devices. Our customers can avail these devices at industry leading rates.

PIIIM-320/1 1 Series:

  • Varistor arrestor type 2
  • 2-pole arrestor
  • 1-phase power supply network TN-S, IT LPZ 1-2
  • Ima. 50 kA
  • M - spare module
  • DS - remote monitor (optional)

Specifications:
Type PIIIM-320/1 1, PIIIM-320 DS/1 1

Nominal VoltageUn230VAC
Max.Continuous Operating VoltageUc320V AC
Lighting impulse current (10/350) L/NIimp7kA
Max. discharge current (8/20)Imax50 kA
Nominal discharge current (8/20) L/PEIn20 kA
Voltage Protection level at InUp<1.45 kV
Nominal discharge current (8/20) N/PEIn20 kA
Temporary over voltage (TOV) L/NUT335 V/5s
Temporary over voltage (TOV) N/PEUT1200 V/0.2 s
Response time L/NtA< 25 ns
Response time N/PEtA< 100 ns
max.back-up fuse
160AgL/gG
Short-Circuit withstand capability
at max.back-up fuse 160 AgL/gG
Ip60 kArms

Additional Information:
  • Item Code: Hakel-Type-2
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Surge Protection Device
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Approx.
Rs 4,500
Per Unit

Surge Protection Device

Product Details:
BrandHakel
ClassA, B, C
Number Of Poles2.0, 4.0
PhaseThree Phase
Our company is well known in the market for offering Surge Protector Device (SPD), which find a vast application in industrial plants, commercial buildings, institutional facilities, and corporate offices. Manufactured from optimum quality raw materials, these easily installed surge protectors offer continuous protection from damaging voltage transients and electrical noise.

PIVM7-320/3 1 series:

  • Varistor arrester type 1 type 2
  • 4-pole arrester
  • 3-phase power supply network TN-S,
  • LPZ 0-1
  • LPL III, IV
  • Total 25 kA
  • TR—spare module
  • DS - remote monitor (optional)

Specifications:

Type PIVM7-320/3 1, PIVM7-320 DS/3 1

Nominal VoltageUn230VAC
Max.Continuous Operating VoltageUc320V AC
Lighting impulse current (10/350) L/NIimp7kA
ChargeQ3.5 As
Specific energyW/R12kJ/Ω
Lighting impulse current (10/350) N/PEIimp25 ka
ChargeQ12.5 As
Specific energyW/R156 kJ/Ω
Total lighting Current (10/350)
L1 N---PE
ITOTAL25 kA
Nominal discharge current (8/20)In30 kA
Voltage Protection levelUp< 1.3 kA
Temporary over voltage (TOV) L/NUT335 V/5s
Temporary over voltage (TOV) N/PEUT1200 V/0.2 s
Response time L/NtA< 25 ns
Response time N/PEtA< 100 ns
Max.back-up fuse
160 AgL/gG

Additional Information:
  • Item Code: Hakel-Type-ThreePhase
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Surge Protector TVSS
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Approx.
Rs 6,500
Per Unit

Surge Protector TVSS

Product Details:
ClassA, B, C
MaterialMetal
Number Of Poles2.0, 4.0
PhaseThree Phase
We are providing a wide range of Surge Protector TVSS to our clients. This protector offer protection from transients on distribution panels, therefore highly demanded in different industrial sectors. Provided protector is precisely manufactured using optimum grade component and innovative technology at well-equipped unit of our reliable vendors. Offered protector is stringently tested by our quality controllers in respect with various quality standards. Moreover, this protector can be availed by our clients at market leading prices.

Features:
  • Rugged design
  • Long service life
  • Over charging protection

Additional Information:
  • Item Code: Hakel-Type2-Three-Phase
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Type 1 2 / Class I II / Class C Surge Arrester
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Approx.
Rs 5,800
Per Unit

Type 1 2 / Class I II / Class C Surge Arrester

Product Details:
BrandHakel
ClassificationType B, Type C, Type D
Poles Number1 Pole, 1pole+N, 2 Pole, 3 Pole, 3 Pole+N
We are manufacturers of TYPE 1 2 / CLASS I II / CLASS B C Surge Arrester. Our all products made from high quality of raw material and advance technology. These products are available in various shapes and sizes in the market.

Pivm7-320/1 1 V series:
  • Varistor arrestor type 1 type 2
  • 2-pole arrestor
  • 1-phase power supply network TN-S, TT
  • LPZ 0-1
  • LPL III, IV
  • 1,00125 kA
  • M - spare module
  • DS - remote monitor (optional)

Specifications:
Type PIVM7-320/1 1, PIVM7-320 DS/1 1

Nominal VoltageUn230VAC
Max.Continuous Operating VoltageUc320V AC
Lighting impulse current (10/350) L/NIimp7kA
ChargeQ3.5 As
Specific energyW/R12kJ/Ω
Lighting impulse current (10/350) N/PEIimp25 ka
ChargeQ12.5 As
Specific energyW/R156 kJ/Ω
Total lighting Current (10/350)
L1 N---PE
ITOTAL25 kA
Nominal discharge current (8/20)In30 kA
Voltage Protection levelUp< 1.3 kA
Temporary over voltage (TOV) L/NUT335 V/5s
Temporary over voltage (TOV) N/PEUT1200 V/0.2 s
Response time L/NtA< 25 ns
Response time N/PEtA< 100 ns
Max.back-up fuse
160 AgL/gG

Additional Information:
  • Item Code: Hakel-Type-Single-Phase
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SPC 25 Surge Protection Device
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Approx.
Rs 11,500
Per Set

SPC 25 Surge Protection Device

Product Details:
Lifetimemin.100 000 h
Weight420 g
Method of assemblyDIN rail 35 mm
In the most adverse of situations, Surge Protection Device need to arrest as much as 100 kA. When distributed into individual strands, the current values amount to 25 kA per strand (using a TN-C) system. That is why we recommend that master distributors of LV unit substations (in buildings qualifying as LPL I protection level) be fitted with the HS 50-50 sealed spark gap with gas filling. Being SPD Type 1, the equipment guarantees the equalisation of potential and disposal of the lightning current as well as the switching surge that is generated in the power supply lines entering the building. It is capable of arresting Iimp currents as large as 50 kA. Unit substations of individual buildings then should be fitted with the SPC25, a combination of SPD Type 1 and 2, that features dual varistors for higher safety and offers 25 kA of arrestable impulse current. Secondary substations and control cabinets should be equipped with SPD Type 2. An example of that class in our product range is the PIII-275, which is offered as a complete, sealed unit or with replaceable modules.

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Type 2 / Class II SPD
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Approx.
Rs 3,500
Per Unit

Type 2 / Class II SPD

Product Details:
BrandHakel
ClassA
Number Of Poles2.0, 4.0
PIIIM-320/1+1 V series is a two-pole, metal oxide varistor surge arrester combined with gas discharge tube, Type 2 & Class II according to EN 61643-11 and IEC 61643-1. These arresters are recommended for use in the Lightning Protection Zones Concept at the boundaries of LPZ 1-2 (according to IEC 1312-1 and EN 62305), where they provide the equipotential bonding and discharge of the switching overvoltage, which is generated in power supply systems entering the building. The main use of PIIIM-320/1+1 V series arrester is in all kinds of industry, residential and administration buildings. They are to be placed into the subsidiary switchboards or control boxes. The marking M specifies a type of construction with removable module. The marking of DS specifies a version with remote monitoring.

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Surge Protection for Telephone
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Approx.
Rs 1,500
Per Piece

Surge Protection for Telephone

Product Details:
BrandHakel
ClassC
Number Of Poles4.0
Degree of protection of enclosureIP20
Owing to our rich experience of this domain, we are engaged in manufacturing the optimum quality of Telecommunication Lines. Manufactured in agreement with the industry laid norms, the offered telecommunication lines are known for their hassle-free installation. Rendered by us at cost effective prices, the offered telecommunication lines are highly demanded.

Features:
  • Easy to install
  • Requires low maintenance
  • Longer serving life

Additional Information:
  • Item Code: HT-Cctv
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SPD Protector
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Approx.
Rs 4,200
Per Unit

SPD Protector

Product Details:
BrandHakel
ClassA, B, C
Number Of Poles2.0, 4.0
PhaseSingle Phase
Allied Power Solutions is one of the leading manufacturers of SPD Protector. Offered devices are incorporated with optimum quality components so as to provide high efficiency and smooth operations. Surge protectors shield various electronic devices from surges in electrical power that flows from the power supply. We provide these efficient three phase surge protectors at industry leading prices.

Features:

  • Low voltage Up
  • No Follow current
  • Common and Differential mode

Specifications:

Type Pl-k8/Pl-k8 DS

Nominal voltage
Un230 VAC
Max, continuous operating voltageUc257 V AC
Nominal currentIN8 A
Nominal discharge current In(8/20)In3 kA (L/N, L/PE)
5 KA (N/PE)
Combined impulseUoc6 kV (L/N,L/PE)
10 kV (N/PE)
Vo Iago protection level at UocUp<850 V (L/N)
<1,5 kV (L/PE)
<1<2 kV (N/PE)
Asymmet Focal Attenuation of filter
{band Stop fl|fer)

min.80 dB at 4Mhz
min. 40 DB (0,15-30 MHz)
Filters constantsCx
Cy
L
150nF
22 nF
1,2mH
Powerless at winning Temp. 20oC
<2,2W
Response timetA<25 ns (L/N)
<100 ns (L/PE,N/PE)
Recommended backup fuse
6 A
Lifetime
min.100.000h
Weightm130 g
Article number

PI k8
30 080
Pl k8 OS
30 082

Additional Information:
  • Item Code: Hakel-Type-3
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Solar PV DC Surge Protection Device
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Approx.
Rs 1,000
Per Piece

Solar PV DC Surge Protection Device

Product Details:
BrandHakel
ClassA, B, C
Number Of Poles2.0, 4.0

Because PV installations must be designed to provide full exposure to the sunlight, they are highly vulnerable to the effects of lightning. The capacity of a PV array is directly related to its exposed surface area, so the potential impact of lightning events increases with system size. Where lighting occurrences are frequent, unprotected PV systems can suffer repeated and significant damage to key components. This results in substantial repair and replacement costs, system downtime and the loss of revenue. Properly designed, specified and installed surge protection devices (SPDs) minimize the potential impact of lightning events when used in conjunction with engineered lightning protection systems. A lightning protection system that incorporates basic elements such as air terminals, proper down conductors, equipotential bonding for all current-carrying components and proper grounding principles provides a canopy of protection against direct strikes. If there is any concern of lightning risk at your PV site, I highly recommend hiring a professional electrical engineer with expertise in this field to provide a risk assessment study and a protection system design if necessary. It is important to understand the difference between lightning protection systems and SPDs. A lightning protection system’s purpose is to channel a direct lightning strike through substantial current-carrying conductors to earth, thus saving structures and equipment from being in the path of that discharge or being directly struck. SPDs are applied to electrical systems to provide a discharge path to earth to save those systems’ components from being exposed to the high-voltage transients caused by the direct or indirect effects of lightning or power system anomalies. Even with an external lightning protection system in place, without SPDs, the effects of lightning can still cause major damage to components. For the purposes of this article, I assume that some form of lightning protection is in place and examine the types, function and benefits of the additional use of appropriate SPDs. In conjunction with a properly engineered lightning protection system, the use of SPDs at key system locations protects major components such as inverters, modules, equipment in combiner boxes, and measurement, control and communications systems. Aside from the consequences of direct lightning strikes to the arrays, interconnecting power cabling is very susceptible to electromagnetically induced transients. Transients directly or indirectly caused by lightning, as well as transients generated by utility-switching functions, expose electrical and electronic equipment to very high overvoltages of very short duration (tens to hundreds of microseconds). Exposure to these transient voltages may cause a catastrophic component failure that may be noticeable by mechanical damage and carbon tracking or be unnoticeable but still cause an equipment or system failure. Long-term exposure to lower-magnitude transients deteriorates dielectric and insulation material in PV system equipment until there is a final breakdown. In addition, voltage transients may appear on measurement, control and communication circuits. These transients may appear to be erroneous signals or information, causing equipment to malfunction or shut down. The strategic placement of SPDs mitigates these issues because they function as shorting or clamping devices.


Additional Information:
  • Item Code: 8-4-RJ-RJ
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PIIIM 320 Surge Protection Device for VFD
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Approx.
Rs 2,000
Per Piece

PIIIM 320 Surge Protection Device for VFD

Product Details:
BrandHakel
ClassA, B
Number Of Poles2.0, 4.0
Due to the action of the drive, the power quality of the electrical environment can be compromised. That is, the drives can create voltage surges and harmonics on the system. There are various technologies available that aid in correcting these issues. This application note focuses on applying surge protective devices (SPDs) to a drive system to mitigate the damage that can occur due to voltage surges while considering the effects of the harmonics on the surge protective device. Often the incoming voltage is 480 V, but other voltages may be used. The incoming power is usually stepped down to a lower voltage (typically 120 Vac) that provides power to the control circuit. The control circuit contains sensitive electronics.

Features:
  • Drive Input: Protecting the drive input is an essential step in protecting the drive system. Providing protection at this location prevents surge damage due to events propagated on the electrical system from upstream sources, external events such as lightning and switching surges created by the utility, and the interaction of multiple drives on the same system.
  • At this location, a parallel connected, voltage responsive circuitry device is appropriate (one without frequency responsive circuitry). Frequency responsive circuitry is not recommended for this location due to the fact that this location is typically more susceptible to impulse transients as opposed to ring wave transients.
  • Inverter Inpu: The inverter input is one of the most sensitive and critical areas of the drive itself. It is at this location that care must be taken and the proper survey conducted. You may install a parallel connected, frequency responsive circuitry device provided you have confirmation that within this drive that no additional capacitors have been installed to mitigate harmonic currents.
  • Control Circuit: The control circuit contains sensitive electronics that can be damaged by the environment created by the drive or by surges from external sources. Protection at this location is essential. Since this circuit is isolated by a step down transformer and it feeds sensitive electronics, a series connected SPD with frequency responsive circuitry is recommended for this location.
  • Drive Outpu: Protecting the immediate drive output is recommended when the length of the connection between the drive and the motor is longer than 50 ft (15 m) or if the connection is routed along an external wall or outdoors.
  • One reason for protecting at the immediate output when the length of the connection to the motor is long is due to reflected waves that can occur as the signal (often higher frequency) from the output of the drive reaches the motor and is then reflect back and forth between the drive and the motor. This action can create "voltage piling" – the reflected voltage adds to the nominal voltage and other reflected waves. The SPD will aid in reducing the voltage peaks of the reflected waves.
  • More importantly, if the connection between the drive and the motor extends outdoors, along a path that is exposed to the environment or close to the building’s steel structure, protection at this location is important to diminish the effects of direct lightning or induced voltage surges due to nearby lightning. These surges can cause damage to the drive, even if protection is provided at the motor input.

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Surge Protection Devices
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Approx.
Rs 1,500
Per Piece

Surge Protection Devices

Product Details:
BrandHakel
ClassA
DTNV 2/80/5 is a complex range of surge protection devices designed for protection of data, communication, measuring and control lines against surge effects. These surge protection devices are recommended for use in the Lightning Protection Zones Concept at the boundaries of LPZ 0A(B) - 1 according to EN 62305. All types provide effective protection of connected equipment against common mode and differential mode surge effects according to IEC 61643-21. The nominal current of individual protected lines IN< 5A. These devices consist of MOVs only. The number of protected pairs is optional (1-4). These devices are produced for nominal voltage within the range of 12V-110V. Maximum discharge current is different according to various types from 2kA (8/20) to 8kA (8/20).

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Equipotential Bonding Surge Protection Devices
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Approx.
Rs 2,000
Per Piece

Equipotential Bonding Surge Protection Devices

Product Details:
ClassA, B, C
Number Of Poles2.0, 4.0
ModelHGS 100
Equipotential Bonding Surge Protection Devices equipotential bonding involves joining together metalwork that is or may be earthed so that it is at the same potential (i.e., voltage) everywhere. Such is commonly used under transformer banks by power companies and under large computer installations. Exact rules for electrical installations vary by country, locality, or supplying power company. Stray currents are inevitably propagated in an earthing network. It is impossible to eliminate all the sources of disturbances for a site. Earth loops are also inevitable. When a magnetic field affects a site, e.g. the field created by lightning, differences in potential are created in the loops formed by the various conductors and the currents flowing in the earthing system. Consequently, the earthing network is directly affected by any counter-measures taken outside the building. As long as the currents flow in the earthing system and not in the electronic circuits, they do no damage. However, when earthing networks are not equipotential, e.g. when they are star connected to the earth electrode, the HF stray currents will flow wherever they can, including in control wires. Equipment can be disturbed, damaged or even destroyed. The only inexpensive means to divide the currents in an earthing system and maintain satisfactory equipotential characteristics is to interconnect the earthing networks. This contributes to better equipotential bonding within the earthing system, but does not remove the need for protective conductors. To meet legal requirements in terms of the safety of persons, sufficiently sized and identified protective conductors must remain in place between each piece of equipment and the earthing terminal. What is more, with the possible exception of a building with a steel structure, a large number of conductors for the ligthning rods or the lightning-protection network must be directly connected to the earth electrode. The fundamental difference between a protective conductor (PE) and a ligthning rod down-conductor is that the first conducts internal currents to the neutral of the MV/LV transformer whereas the second carries external current (from outside the installation) to the earth electrode. In a building, it is advised to connect an earthing network to all accessible conducting structures, namely metal beams and door frames, pipes, etc. It is generally sufficient to connect metal trunking, cable trays and lintels, pipes, ventilation ducts, etc. at as many points as possible. In places where there is a large amount of equipment and the size of the mesh in the bonding network is greater than four metres, an equipotential conductor should be added. The size and type of conductor are not of critical importance. It is imperative to interconnect the earthing networks of buildings that have shared cable connections. Interconnection of the earthing networks must take place via a number of conductors and all the internal metal structures of the buildings or linking the buildings (on the condition that they are not interrupted).

In a given building, the various earthing networks (electronics, computing, telecom, etc.) must be interconnected to form a single equipotential bonding network. This earthing-network must be as meshed as possible. If the earthing network is equipotential, the differences in potential between communicating devices will be low and a large number of EMC problems disappear. Differences in potential are also reduced in the event of insulation faults or lightning strikes. If equipotential conditions between buildings cannot be achieved or if the distance between buildings is greater than ten metres, it is highly recommended to use optical fibre for communication links and galvanic insulators for measurement and communication systems. These measures are mandatory if the electrical supply system uses the IT or TN-C system.

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Combicontroller SPD
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Approx.
Rs 1,500
Per Piece

Combicontroller SPD

Product Details:
BrandHakel
ClassA, B, C
Number Of Poles2.0, 4.0
We are one of the leading manufacturers and wholesalers of the optimum quality of Incoming Power Lines To The Object. The offered incoming power lines to the object is used in the lighting protection zone. We have been able to take and complete bulk demands, owing to our large scale production capacity and spacious warehousing unit.

Features:
  • Robust construction
  • Overload protection
  • Easy to install

Other Details:

  • PIVM is modular lightning arrester type 1 according to EN 61643-11
  • Complete device consist of a base part and pluggable module
  • These arresters are recommended for use in the Lightning Protection Zones Concept at the boundaries of LPZ 0 – 1 (according to IEC 1312-1 and EN 62305) for lightning current equipotential bonding and elimination of switching surges that originate in power supply systems entering the building
  • The PIVM is mainly intended for use in TNC systems
  • For TNS and TT systems it is necessary to combine these arresters with lightning arrester, B25M which is intended for equipotential bonding between N and PE
  • The main use of PIVM arrester is in structures of LPL III – IV according to EN 62305, e.g. residential houses with cable supply and subdistribution boards of big industrial structures.

Technical Specifications:
Type PIVM12,5-275/3 1 Vseries
Max. continuous operating voltageUC 275 V AC
Lightning impulse current (10/350)Iimp 12,5 kA
Impulse current (10/350) N/PEIimp 50 kA
Nominal impulse discharge current (8/20)In 20 kA
Voltage protection levelUp < 1,2 kV
Max. back-up fuseMax. back-up fuse
Article number16054

Since it is impossible to prevent voltage surges from either entering a building or from occurring inside a building, surge protection was invented. The function of the surge protector is to stop (or at least limit) the effects of less-than-perfect power quality on solid-state electronic devices.

 

Surge protective devices (SPDs) reduce and divert transient voltage levels. SPDs were formerly known as Transient Voltage Surge Suppressors (TVSS).

 

Surge protective devices are designed to reduce potentially damaging short-duration transients present on:

  • telephone or facsimile lines,
  • cable TV feeds,
  • security systems,
  • entertainment center or stereo equipment,
  • kitchen or other household appliances, and any other power or control lines connected to electronic equipment, such as computers.

Additional Information:
  • Item Code: PIVM12-5-275-3-1Vseries
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Ethernet Surge Protection Device
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Approx.
Rs 2,000
Per Piece

Ethernet Surge Protection Device

Product Details:
BrandHakel
ClassA, B, C
Number Of Poles2.0, 4.0
The use of Ethernet Surge Protection Device to protect sensitive equipment from lightning hits and surges on Ethernet data lines has become more important than ever with the advent of faster standards like 100 and 1000 Base-T Ethernet. The faster data speeds have required equipment manufacturers to use fragile high speed components. The need to keep cost low has meant the Ethernet interface is now integrated onto the main PCB assembly, designs with minimal part count and the use of low cost (lower power) components. A surge that would have left an older “beefy” 10Base-T interface untouched could easily destroy a sensitive 100/1000Base-T interface. In the past if a 10BaseT interface was damaged, it was easily replaced at minimal cost. With modern equipment having integrated 100/1000Base-T interfaces, this is not the case anymore. The Motherboard or more likely the entire piece of equipment will need to be replaced. The risk of not using an external surge protector is higher than ever.

The use of a surge protector on an Ethernet line is not without its consequences however. All Ethernet surge protectors will degrade the performance of the Ethernet line. The use of protective components that inherently have a capacitive component as well as the limitations of PCB layout techniques contribute to the degradation. The degradation is in the form of increases in line insertion loss, phase distortion, crosstalk, degraded common mode rejection, and possible ground loops. The use of two protectors on each end of the line will provide protection for each end against surges, at the cost of increased line loss and the possibility of introducing a ground loop into the line. HAKEL offers multistage surge protectors that offer much higher levels of surge protection compared to competitor’s products. These surge protectors will survive surges over 100 times higher than a standard design. The additional stages of protection do contribute higher losses however and will shorten the maximum line length over a single stage design.

Additional Information:
  • Item Code: 1-2-RJ
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Telecommunication Lines Surge Protector
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Approx.
Rs 1,000
Per Piece

Telecommunication Lines Surge Protector

Product Details:
BrandHakel
ClassA
Protection LevelIP 66
Telephone lines are long copper wires from central office to your apartment. Usually those wires are between few hundred meters to few kilometers. Those wires are connected in the central office to the telephone center/exchange. Normally there is only the 48V DC voltage from central office battery in the line, and when phone ring there is 70-130V AC voltage in the line. That's what in the line in normal operation. But the situation in the thunderstorm is different. When the lightning hits the ground with it's millions of volts and thousands of ampreres strike every wire in the ground or hanging in the air will notice it. Near lightning strike gan generate a surge pulse of thousands of volts to telephone lines. If this can go to the electronics inside the telephone or modem, the electronics will destroy at the same moment. The surge can destroy electronics in both subscriber's and central office end, so you must think that telecom operator must have done something to this problem. Yes they have. First they have installed surge suppression devices to their central office to make sure that small surges dos not damage it. They have usually also installed some sort of protection to subscriber's side of the line to the place where telephone cable enters the house or to the the telephone pole just next to the house. That type of protection devices are very common on rurals installations, where there are very long lines and they are usually hanging in the air from telecom poles so they are much more prone to lightning strike surges. In bigger cities lightning protectors are not always used because different buildings are usually electrically so tightly connected to each other (though electric feed, plumbing etc.) and cables are in the ground so there is not possible to generate so big surge voltages because of potential differences between different points (central office and subscriber).

There are two types of surges:
  • Differential and common mode. Differential surge is a voltage surge which is generated between the telephone wires. That is usually not great, because telephone wires are twisted pairs and is easy to stop by palacing suitable protection component between telphone line wires. Other type of surge is common mode surge, in which the potential of the telephone wires raises thousands of volts from your ground potential. Usually the telephone wires are at potential quite near to the ground of your building. But if the lightning strike hits the central office (or some else place in telecom cabling near you), the potential of both of the telephone line wires can raise quite high (even thousands of volts). The common mode surges are usually bigger and more problematic than differential surges.
  • Telephones are devices sitting in the end of the telecommunication line electrically isolated from rest of the building. They are not very prone to common mode surges, unless they are special phones which are connected also to mains (for example those which have answering machine in them). The thing which breaks ordinary telephone is differential surge, because it is the surge which can get to the electronics of the telephone. Modern telephones usually damage easier, because electronics will break down more easily than the transformers, carbon microphones and mechanical rotary dials used in older telephones. In cheap modern telephones there is usally not much done to protect them from surges, because good protection could easily cost more than the telephone itself. It is economically wise. If cheap telephone breaks down people go to shop and buy new one. If telephones are damaged often, then it migh be a good idea to install a good surge suppressor.

Additional Information:
  • Item Code: HT-CCTV-6-Xseries
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