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external spd

External Mount

ASCO provides a range of surge protective devices that mount alongside panel boards and electrical equipment.
internal spd

Traffic Cabinet

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

Video / Security / Fire

ASCO Surge Protective Devices mitigate power events that can damage components in critical equipment.
control panel spd

Speciality

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 Model 440 is nonmodular and high-energy capable. It offers termally 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 Model 277 is a series-connected , DIN or flange mountable, 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.

Solutions

Two women assessing data center server racks

Data Centers

Two doctors assessing medical images

Healthcare

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.

Ready to order?

Find your local ASCO sales representative.