Keeping Current: Switching from 140M to 140MT Circuit Breakers
Rockwell’s 140M motor protective circuit breakers (MPCB) are discontinued, so it’s time to migrate to the 140MT. What is changing, why is it changing and how has it improved? Watch Matt Henning, Van Meter’s Smart Devices Specialist, walk you through what’s new or read on to discover what you need to know.
WHY IS THE 140M MPCB SWITCHING TO THE 140MT?
With new changes in code standards, Rockwell has updated the 140M MPCB line to have better short circuit ratings, group ratings for motors and UL Type E protection among other things.
WHAT IS CHANGING FROM THE 140M MPCB TO THE 140MT?
The good news is that the changes are minimal for most people. The new device has the same form, fit and fashion as the 140M. The biggest change is that accessories like bus bars, auxiliary contacts and shunt trips from the 140M will not work with the 140MT. If you are buying or using accessories, make sure they are for the 140MT.
HOW HAS THE 140MT MPCB IMPROVED FROM THE 140M?
For electrical code and safety purposes, it is important to make sure your circuit protection devices are coordinated, or tested, with each other. The 140MT MPCB has a tested rating with Rockwell’s 100K, 100C and 100E contactor, which you can print off the Global Short-Circuit Current Ratings (SCCR) Tool on Rockwell’s website and hand to your UL inspector.
The 140MT also produces significantly less heat to add to your enclosure. It’s a big advantage for panel builders concerned with watts loss, or heat rise, within their enclosure.
WHERE CAN I GET HELP TRANSFERRING FROM THE 140M MPCB TO THE 140MT?
If you have not yet migrated from the 140M MPCB to the 140MT, Van Meter has several resources to help you out. Call 319-368-2888 or email [email protected] to reach Van Meter’s Automation Support Team, or contact one of our Automation Specialists with any questions.
