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Signal Line Protectors

Guard your sensitive equipment and applications against “back door” transients with signal line protectors. These surge protection devices are used for transmitters and sensors in areas where lightning strikes are common. Find the SPDs perfect for your need by browsing below. Need help to find the best surge protection solutions? The Surge Protection Device Selection Tool helps you select SPDs for a broad range of applications from small data rooms to enterprise data centers.

ASCO Model 137 (Edco FAS-TEL-DOT) Surge Protective Device

The Edco FAS-TEL-DOT is a single pair telephone protector that implements an advanced three-stage hybrid design. This unit addresses over-voltage transients with gas discharge tubes (GDT) and silicon breakover devices.

ASCO Model 185 (Edco CAT6-POE) Surge Protective Device

The Edco CAT6-POE Series is designed to work on Category 6 Power-Over-Ethernet transmission line applications.

ASCO Model 146 (Edco PLP-S) Surge Protective Device

Provides isolated power loop circuit protection in applications where higher current is required, such as fire alarm and security systems. Non-degrading SADS will last the lifetime of equipment, ensuring uptime.

ASCO Model 265 (Edco SLAC) Surge Protective Device

Suppressor specifically designed to protect electronic instruments used by the water/wastewater industries.



ASCO Model 174 (Edco SLCP Series) Surge Protective Device

The Edco SLCP Series are four-wire modules designed to protect signaling line circuits (SLC). The device has 0 ohms of resistance and offers line to ground protection.

ASCO Model 175 (Edco PC642 Series) Surge Protective Device

Employs three-stage hybrid technology to address overvoltage transients and sneak and fault current for phones, data/communication lines and transmitters.

ASCO Model 172 (Edco PHC Series) Surge Protective Device

Designed to protect two pairs of wires specifically for alarm and security systems where operating currents can be as high as 5 Amps.

ASCO Model 138 (Edco RJA-RJD Series) Surge Protective Device

Four-pair telephone/data line protectors that implement advanced two stage hybrid design. These units address over voltage transients with silicon breakover devices, while sneak and fault currents are mitigated with PTC technology, which consists of solid state resettable fuses.

ASCO Model 162 (Edco CCTV-1) Surge Protective Device

Specifically designed for lightning protection on closed circuit TV systems.

ASCO Model 165 (Edco CATV-145A) Surge Protective Device

This product is designed to protect coaxial cable TV signal lines from lightning transients.

ASCO Model 160 (Edco CX-06 Series) Surge Protective Device

Surge Protective Devices (SPDs) that address over-voltage transients with a primary Gas Discharge Tube (GDT), and secondary Silicon Avalanche Diode (SAD) components.

ASCO Model 161 (Edco CP-24) Surge Protective Device

The Edco CP-24 Series is designed to protect DC power directly at CCTV cameras.

ASCO Model 166 (Edco CX-HFN) Surge Protective Device

Surge protectors designed to protect sensitive electronic equipment from damage due to excessive voltage or currents generated by lightning or static build-up.

ASCO Model 155 (Edco EL-EDS) Surge Protective Device

Suppressor kit intended for installation with electrical switching devices that are connected through a relay contact on typical access control panels.

ASCO Model 151 (Edco FAS-1 & FAS-2) Surge Protective Device

Multi-stage single-pair or two-pair surge suppressors designed for high exposure applications.

ASCO Model 232 (Edco MPA Series) Surge Protective Device

Modular device intended for use on traffic control load relay outputs.

ASCO Model 145 (Edco MRA-6LC-6) Surge Protective Device

Designed for any traffic controller cabinet equipped with 6-position, 5.08mm spacing sockets wired in line with load relay outputs.

ASCO Model 233 (Edco SPA-100T and SPA-300) Surge Protective Device

Designed to protect sensitive electronic equipment such as traffic controllers, from high energy surges.

ASCO Model 231 (Edco SPA-303) Surge Protective Device

Three-circuit protective device intended for use on traffic control load relay outputs.

ASCO Model 140 (Edco SRA-6LC) Surge Protective Device

Addresses over voltage transients on both Common and Differential modes with state-of-the-art silicon breakover devices.

ASCO Model 141 (Edco SRA16C-1) Surge Protective Device

The Edco SRA16C-1 is a three terminal device, two of which are connected across the signal inputs of the detector for differential mode protection, and the third is grounded to protect against common mode damage.

ASCO Model 157 (Edco SS64 & SS65) Surge Protective Device

Multi-stage hybrid suppressors address over-voltage transients with gas tube and silicon avalanche technology.

asco 152

ASCO Model 152 (Edco TCS-T1) Surge Protective Device

Combines highly reliable, non-degrading Silicon Avalanche Diode (SAD) technology, along with high energy gas tube protection.

asco model 252

ASCO Model 252 (Edco HSP Series) Surge Protective Device

The ASCO Model 252 Surge Protective Device is an advanced three-stage hybrid, solid state power line protector.

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