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Product Categories

internal spd

Traffic Cabinet

Protect traffic control equipment from transient overvoltage with ASCO's surge protective devices for power, data, video and loop applications.
video spd

Industrial/Control Panel Mount

ASCO control panel mounted surge devices will prevent missed or false zero crossover readings that could result in a need to re-boot a PLC system.
control panel spd


Built for the specific demands of medium-voltage, UPS, rackmount, water treatment, lighting and rackmount applications.

Featured Products

ASCO 560 surge protective device

560 Surge Protective Device

Repetitive life-cycle capability, high-energy capacity, and years of proven service make the Model 560 a leading choice for high-risk locations and critical process equipment.
ASCO 440 surge protective device

440 Surge Protective Device

The 440 Surge Protective Device, is non-modular, high-energy capable and thermally protected large block MOVs.
ASCO series 420 surge protective device

420 Surge Protective Device

The Model 420 uses thermally protected MOVs, is tested as a UL 1449 Type 1 device and is in a NEMA 4X enclosure, making this an ideal choice for both panel and equipment locations.
ASCO 277 series surge protective device

277 Surge Protective Device

The ASCO Model 277 (Islatrol IE) is a series-connected DIN or flange mounted high frequency noise filter and surge suppressor. Its ideal applications include critical industrial loads drawing up to 20 Amps of continuous current.

Featured Content

Five illuminated LED lightbulbs

White Paper — Monitoring SPD Condition

Surge protective devices feature a wide range of indicators that identify operating status. This paper describes indicator options.
The Washington DC Metro Area Museum

Case Study — Protecting Museum Water Infrastructure from Surges

After lightning damaged costly groundwater pumping equipment, a museum turned to ASCO to develop a down-well surge protection solution.
ASCO 500 series surge protective devices family

ASCO 500 Series Surge Protective Devices explained

500 SERIES Surge Protective Devices are designed with strict industry requirements in mind. This diverse family of products uses patented surge technology to provide survivability and exceptional performance.
  • Placement Considerations for Surge Protective Devices

    When planning surge protection projects, it is important to consider how installation practices can affect the performance and serviceability of SPDs.


Two women assessing data centre server racks

Data Centres 

Two doctors assessing medical images


Ant's eye view of multiple buildings

Commercial Buildings 

Need a technical document?

Find a range of drawings, manuals and data sheets for your Surge Device.

Need support?

Contact our support team for technical help and information.