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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 time, power line tracking, and compression screw terminations, make the Model 252 Surge Protective Device an excellent choice in commercial and industrial applications.

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 of each protection method in a single, reliable design to ensure optimal performance.

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 addition, sneak and fault currents are mitigated with PTC devices which consist of solid-state resettable fuses.

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 to protect against common mode damage. Model 141 is intended for all current detector models on the market.

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 to protect against common mode damage. The Model 140 SPDs are intended for all popular makes of loop detectors presently on the market.

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 spacing sockets wired in line with load relay outputs.

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 and a ground stud.

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 circuits and 232120NS26KAA6N0 will protect four output circuits.

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

The ASCO Model 155 suppressor kit is intended for installation with electrical switching devices that are connected through a relay contact on typical access control panels.

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 low signal loss at frequencies up to 3 gigahertz.

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 ground wire must be attached to the unit. The Model 165 offers low loss even at frequencies approaching 750 Mhz. This is important for error-free data communications.

ASCO Model 172 (Edco PHC Series) Surge Protective Device

The ASCO Model 172 Surge Protective Device 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 Model 172 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. These products are intended to mate with a PCB1B gold-plated female terminal connector accessory.

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 the DIGITAL Model 138 voltage clamp is set for Digital Extensions (no ring in voltage).

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 snapped together, the data circuits “pass thru” the protector in a serial fashion from the four “Field Side” terminals to the four “Electronics Side” terminals.

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 a NEMA-4X polycarbonate case. The AC power suppressor can supply up to 1,875 Watts and has a 15A replaceable fuse to prevent overloading of the protective elements. The “Power On” LED provides visual indication that power is applied to instruments.

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 these surges before equipment damage occurs.

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

The ASCO Model 151 is a 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 ASCO Model 161 Surge Protective Device is easily installed directly at and in series with a camera's power terminal. The Model 161 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 162 (Edco CCTV-1) Surge Protective Device

The ASCO Model 162 Surge Protective Device is specifically designed for lightning protection on closed circuit TV systems. The protector is easily installed with standard type BNC coax connectors. The Model 162 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 ASCO Model 175, (Edco PC-642) Surge Protective Device employs three-stage hybrid technology to address over-voltage transients and sneak and fault current for phones, data/communication lines and transmitters.

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

The ASCO Model 185 Surge Protective Device 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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