Codes & Standards
News & Updates
NEMA AB 3 Molded Case Circuit Breakers and Their Application published
By Alyssa Dalton
October 5, 2012 – The National Electrical Manufacturers Association (NEMA) has published “NEMA AB 3 Molded Case Circuit Breakers and Their Application”, which covers molded case circuit breakers and molded case switches, single-pole and multi-pole, fused and unfused, and their accessories. These circuit breakers and switches are assembled as integral units in supporting housings of insulating material and have rated voltages up to and including 1000V, 50/60Hz, ac or ac/dc, and have rated interrupting current ratings of 5000A or more. Updates to this publication include the addition of photovoltaic (PV) circuit breakers, National Electrical Code (NEC) references, and diagrams.