
DC Circuit Breakers
DC Retrofits or New Panel Builds by Patriot

MM74 HSCB Retrofit
ANSI C37.14
Retrofitted with High Speed ABB Gerapid
Installed directly into the existing gear
For DC Traction, Ships & Steel Works
20000 Mechanical Operations
Electromagnetic Trip
1000-4000 Rated Voltage
12kV Rated Impulse Withstand Voltage
4150 Amp Rated Continuous Current
2-10kA Rated Current
Efficient upgrade for obsolete, aging and problematic equipment
Updated CAD Drawings
Full future support


Spare parts for all your MM74 needs!

If you are upgrading or removing your MM74’s from service, sell Patriot your excess removals

Whipp & Bourne DC Breakers

Thanks for your interest in Patriot Breakers & Switchgear. We will return your quote as soon as possible!
Thanks again for choosing Patriot Switchgear!

