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AC Line Surge Protectors

Type 1 surge protection devices are combined lightning current and surge arresters that are used in unmetered areas. They are meant to protect against the effects of direct lightning strikes and must satisfy very stringent requirements. In order to meet these requirements, spark gap technology is required. A spark gap will break down during an abnormal voltage surge, safely shunting the surge to ground.

Type 2 surge protection devices with a low discharge capacity are installed in the metered area. They are generally installed in machine control cabinets or sub-distributions. They do not have to handle direct lightning strikes, but they must be able to discharge over-voltages from indirect lightning strikes or switching operations. Varistor technology is proven itself here.  At low voltage, the varistor has a high electrical resistance which decreases as the voltage increases. When an over-voltage occurs, the varistor’s resistance drops, allowing the extra current to flow through the varistor and safely to ground.

Type 3 surge protection devices with the lowest discharge capacity are installed as close as possible to the end device. The devices have a wide range of designs to suit the various different installation environments. Type 3 surge protection is similar to type two, which is based on varistors, but the requirements concerning discharge capacity are lower compared to type 2.

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Found 479 items
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Phoenix Contact (205)
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Transtector (258)
Surge Protector Type
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Surge Protection For NEMA Power Supply Units (3)
Surge Protector Line Voltage
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Surge Protector MCOV
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138 VAC (L-N) (1)
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Maximum Continous Voltage
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100 Volt (5)
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130 Volt (1)
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175 Volt (2)
180 Volt (1)
Nominal Discharge Current
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100 Amp (1)
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2 Ka (4)
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25 Ka (3)
35 Ka (1)
5 Ka (1)
50 Ka (3)
Max Discharge Capacity
100 A (260 V) (2)
100 A (264 V AC) (2)
100 A (305 V AC) (1)
1000 V DC (1)
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125 A (< 55 °C) (1)
16 A (30 °C) (2)
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20 A (1)
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Line-Line (35)
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Surge Protector Standards
ANSI C62.45-2002 (1)
C62.41-2002 (1)
CE (3)
IEC 61643-1 (2)
IEC 61643-1 Class II (1)
IEC 61643-11 (1)
IEC C62.41 (1)
IEC EN60529 (1)
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I (6)
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Transtector I2R-T240-R230 - Replacement Module
Free U.S Ground shipping
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Transtector I2R-T125-R230 - Replacement Module
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$105.47
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Transtector I2R-T112-RG - Replacement Module
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Transtector I2R-T112-R230 - Replacement Module
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$73.01
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Transtector RRPA-120THC AC Surge Protector - 240 VAC
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$1877.90
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Transtector IMAX-120S-SR - APEX IMAX 120V SASD REPLACEMENT MODULE
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Transtector IMAX-120S-MR - APEX IMAX 120V MOV REPLACEMENT MODULE
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Transtector I2R-T240-4PG277 AC Surge Protector - 277 VAC
Free U.S Ground shipping
$162.28
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Transtector I2R-T240-4P277 AC Surge Protector - 277 VAC
Free U.S Ground shipping
$268.92
$224.10
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Transtector I2R-T240-4P230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$326.88
$272.40
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Transtector I2R-T240-3P690 AC Surge Protector - 690 VAC
Free U.S Ground shipping
$114.74
$95.62
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Transtector I2R-T240-3P480 AC Surge Protector - 480 VAC
Free U.S Ground shipping
$299.05
$249.21
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Transtector I2R-T240-3P400 AC Surge Protector - 400 VAC
Free U.S Ground shipping
$357.01
$297.51
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Transtector I2R-T240-3P208 AC Surge Protector - 208 VAC
Free U.S Ground shipping
$343.10
$285.92
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Transtector I2R-T240-2PG277 AC Surge Protector - 277 VAC
Free U.S Ground shipping
$224.87
$187.39
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Transtector I2R-T240-2PG230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$208.64
$173.87
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Transtector I2R-T240-2PG120 AC Surge Protector - 120 VAC
Free U.S Ground shipping
$271.24
$226.03
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Transtector I2R-T240-1P690 AC Surge Protector - 690 VAC
Free U.S Ground shipping
$98.52
$82.10
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Transtector I2R-T240-1P400 AC Surge Protector - 400 VAC
Free U.S Ground shipping
$100.84
$84.03
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Transtector I2R-T240-1P277 AC Surge Protector - 277 VAC
Free U.S Ground shipping
$104.32
$86.93
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Transtector I2R-T240-1P230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$113.58
$94.65
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Transtector I2R-T240-1P120 AC Surge Protector - 120 VAC
Free U.S Ground shipping
$136.76
$113.97
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Transtector I2R-T125-4PG230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$1014.30
$845.25
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Transtector I2R-T125-3P230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$326.88
$272.40
Normally In Stock
Transtector I2R-T125-2PG230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$271.24
$226.03
Normally In Stock
Transtector I2R-T125-1P230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$496.12
$413.43
Normally In Stock
Transtector I2R-T112-4PG230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$683.93
$569.94
Normally In Stock
Transtector I2R-T112-4P230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$782.46
$652.05
Normally In Stock
Transtector I2R-T112-2PG230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$173.87
$144.89
Normally In Stock
Transtector I2R-T112-2P230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$405.71
$338.09
Normally In Stock
Transtector I2R-T112-1P230 AC Surge Protector - 230 VAC
Free U.S Ground shipping
$259.64
$216.37
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Transtector I2R-75KR480 AC Surge Protector - 480 VAC
Free U.S Ground shipping
$63.74
$53.12
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Transtector I2R-75KR347 AC Surge Protector - 347 VAC
Free U.S Ground shipping
$57.71
$48.09
Normally In Stock
Transtector I2R-75KR277 AC Surge Protector - 277 VAC
Free U.S Ground shipping
$63.74
$53.12
Normally In Stock
Transtector I2R-75KR240 AC Surge Protector - 240 VAC
Free U.S Ground shipping
$75.34
$62.78
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Transtector I2R-75KR120 AC Surge Protector - 120 VAC
Free U.S Ground shipping
$71.86
$59.88
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Transtector B94-00-4741 - LEA PV 400 277/480-3Y-1-D
Free U.S Ground shipping
$4277.45
$3564.54
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Transtector B94-00-2741 - LEA PV 200 277/480-3Y-1-D
Free U.S Ground shipping
$6734.95
$5612.46
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Transtector B94-00-2141 - LEA PV 200 120/208-3Y-D
Free U.S Ground shipping
$6978.38
$5815.32
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Transtector B93-00-6741 - LEA PV 600 277/480-3Y-1
Free U.S Ground shipping
$3825.36
$3187.80
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Transtector B93-00-4741 - LEA PV 400 277/480-3Y-1
Free U.S Ground shipping
$6630.62
$5525.52
Normally In Stock
Transtector B93-00-4141 - LEA PV 400 120/208-3Y-1
Free U.S Ground shipping
$4381.78
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More Information about AC Line Surge Protectors

Power surges occur when there is a sudden increase of voltage sent through a power system from an internal or external force. Such forces can be caused by lightning strikes, electrical overload, faulty wiring or utility switching. Surge protection devices provide a line of defense against power surges preventing irreparable damage to equipment and costly downtime. Surge protection devices are generally classified according to their performance values, depending on the protection class and location of use.

Surge Protection Basics

What causes power surges? 

Lightning strikes are one of the most common causes of power surges and can affect an electrical system even if the strike occurs miles from the electrical source. Conductors buried underground can still transmit the energy of the strike to electrical equipment located indoors. Lightning rods and other grounding equipment can help, but do not completely eliminate the risk.

Switching equipment such as motors, transformers and other equipment can cause a sudden change in load, power loss and disconnection of circuit breakers. This sudden switching can cause overvoltage, leading to power surges. The closer the switching occurs to the electrical system, the more threat it will pose to the equipment.

Operations that a user performs can cause surges, but typically have a very short duration. Examples include: starting a motor, opening circuit breakers and welding equipment.

What is the best way to stop power surges? 

By using transient surge suppressors, the problems associated with most transient surges can be eliminated. They provide protection by either blocking or shorting the voltage over its operating limit to ground, protecting circuits downstream of the suppressor. The best way to approach this is in tiers.  

Tier 1 – The protection is closest to the incoming power source. This is the main protection for a particular location.

Tier 2 – This is in an area that will be protecting multiple devices that have branch protection. An electrical control panel would be an example of this type of application.

Tier 3 – Individual protection. In the case of an industrial control panel, this would be protection for each instrument entering the panel.