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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 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. Features such as noise filtering, common mode and normal mode suppression, nanosecond reaction… read more →

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

The ASCO Model 152 Surge Protective Device combines highly reliable, non-degrading Silicon Avalanche Diode (SAD) technology, along with high energy gas tube protection. This technology combination leverages the best aspects… read more →

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

The ASCO Model 157 Surge Protective Device is designed for the water and wastewater industry. These multi-stage hybrid suppressors address over-voltage transients with gas tube and silicon avalanche technology. In… read more →

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

The ASCO Model 141 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… read more →

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

The ASCO Model 140 SPDs are three terminal devices, two of which are connected across the signal inputs of the detector for differential mode protection, and the third is grounded… read more →

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

The ASCO Model 145 is a modular Surge Protective Device utilizing solid state silicon fold-over technology. Model 145 is designed for any traffic controller cabinet equipped with 6 position, 5.08mm… read more →

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

The ASCO Model 231 (Edco SPA-303) is a three circuit Surge Protective Device intended for use on traffic control load relay outputs. The Model 231 is furnished with three leads… read more →

ASCO Model 232 (Edco MPA Series) Surge Protective Device

The ASCO Model 232 (Edco MPA) modular output file protector is a modular device intended for use on traffic control load relay outputs. Part numbers 232120NS26KAA9N0 will protect six output… read more →

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

The Edco EL-EDS suppressor kit is intended for installation with electrical switching devices that are connected through a relay contact on typical access control panels. It protects against electrical anomalies (transients) that are generated as a result of the collapsing electrical field of an electromagnetic switching device (maglock or electric strike).

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

The ASCO Model 166 Surge Protective Device is designed to protect sensitive electronic equipment from damage due to excessive voltage or currents generated by lightning or static build-up. It offers… read more →

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

The ASCO Model 165 Surge Protective Device is specifically designed for lightning protection on Coax Cable TV Systems. The protector is easily installed with standard type “F” coax connectors. A… read more →

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

The ASCO Model 138 incorporates female jacks in and out. The ANALOG Model 138 voltage clamp is set for C.O. Trunks and Analog Telephone Extensions (with ring in voltage), and… read more →

ASCO Model 172 (Edco PHC Series) Surge Protective Device

The Edco PHC Series is designed to protect two pairs of wires specifically for alarm and security systems where operating currents can be as high as 5 Amps. Electrically, the Edco PHC Series is a rugged series hybrid implementing a staged complement of MOVs, copper wound inductors and Silicon Avalanche Diodes. This design reduces series resistance to 0.2 Ohms per pair.

ASCO Model 174 (Edco SLCP Series) Surge Protective Device

The ASCO Model 173 Surge Protective Device is a gold-plated, double-sided card edge module and is designed to mate with the ASCO PCB1B gold-plated female terminal connector (sold separately). When… read more →

ASCO Model 265 (Edco SLAC) Surge Protective Device

The ASCO Model 265 Surge Protective Device is specifically designed to protect electronic instrumentation utilized by the water/wastewater industries. It combines hybrid AC power protection and signal line protection in… read more →

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

The ASCO Model 146 provides isolated power loop circuit protection in applications where higher current is required, such as fire alarm and security systems.

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

The ASCO Model 137 is a single pair telephone protector that implements an advanced three-stage hybrid design. Model 137 is specifically designed for more rugged applications such as traffic cabinets.

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

The ASCO Model 233 Surge Protective Device is designed to protect sensitive electronic equipment such as traffic controllers, from high energy surges. The Model 233 incorporates MOV technology which clamps… read more →

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

The Edco FAS-1 and Edco FAS-2 are multi-stage single-pair or two-pair surge suppressors designed for high exposure applications. These products were specifically designed to meet multiple low voltage protection applications in the fire and security industries.

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

The Edco CP-24 surge protector is easily installed directly at and in series with a camera's power terminal. The CP-24 uses 2.1mm jacks to connect to the cameras power adaptor and power feed. High-speed SAD technology clamps high energy transients that could damage the CCTV equipment.

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

The Edco CX06-M & Edco CX06-MI and CX06-MI-SBL Surge Protective Devices (SPDs) implement three-stage hybrid technology. Sneak and fault currents are mitigated with solid-state resettable fuses—PTCs. The Edco CX06-M and Edco CX06-MI SPDs and CX06-MI-SBL are designed in accordance with NFPA 780 (2004 edition) requirements, with up to 20kA of surge current capability.

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

The Edco CCTV-1 application is specifically designed for lightning protection on closed circuit TV systems. The protector is easily installed with standard type BNC coax connectors. The Edco CCTV-1 offers low loss even at frequencies approaching 500 Mhz. This is important for error-free data communication applications.

ASCO Model 175 (Edco PC642 Series) Surge Protective Device

The Edco PC642 surge suppressor is a two-pair (four-wire) module implementing three-stage hybrid technology. This module addresses over-voltage transients with gas tubes and silicon avalanche components. In addition, sneak and fault currents are mitigated with resettable fuses (PTCs).

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 and is ideal for protecting expensive computer and video equipment from damaging surges and transients.

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