Critical Power Automation & Management

Come and join us on the 22nd January as we discuss critical power challenges and future trends.

Register Now
Per Mode and Per Phase Ratings Defined

This paper describes how these terms apply to SPD ratings and demonstrates their application to a four-wire Wye system, which is among the most common wiring configurations.

Read More
ASCO Product Portfolio Video

Learn more about our products.

Hospital facility powered by ASCO products
Explore our Load Banks & Sigma Control

Our new interactive webpage explains the numerous best-in-class features of our load banks and Sigma control.

Try it now
Industry Leading White Papers

Subscribe to our mailing list and receive our latest white papers straight to your inbox...


ASCO Engineer examining machine


ASCO Power Technologies has provided power reliability solutions for more than 125 years. It’s our commitment to innovation that makes our power products and service solutions indispensable in mission-critical functions in different industries.

ASCO Engineer inside laboratory

Engineered For Reliability

Unplanned downtime affects every aspect of your business. That’s why we offer reliable and efficient products that work together to safeguard your mission-critical networks. From paralleling switchgear to surge surpressors, load banks to communication products and power quality measurement tools, ASCO innovation stretches way beyond transfer switches.



Per Mode and Per Phase Ratings Defined

When describing Surge Protective Devices (SPDs), manufacturers typically specify surge capacity ratings as either “Per Mode” or “Per Phase.” Users can sometimes be confused by these terms. This paper describes how these terms apply to SPD...

January 09, 2019

Transfer Mechanism Basics

October 31, 2018

Monitoring Engine Start Signal Circuits

To start emergency generators, transfer switches typically use a signal circuit controlled by a normally closed contact. When utility power fails, the contact de-energizes and closes and a start signal is sent to the engine, as shown belo...

October 30, 2018

We design, manufacture, and support groundbreaking power protective devices and systems that integrate hardware and software efficiency. All our products are built to surpass today’s demanding worldwide standards. We deliver unrivaled service on a global scale, every time.