Description
2.1 Overview - applications and portfolio
3VA molded case circuit breakers with UL and IEC certification
20
Manual, 01/2019, L1V30435333-01
100% rated versions of the 3VA UL molded case circuit breaker
The US National Electrical Code, NEC recognizes two categories of overcurrent protective
devices (OCPD) and has different required load calculations for their application. The two
categories are standard OCPDs and OCPDs listed for operation at 100% of their rating
(commonly referred to as "100 % rated").
For standard OCPDs, the rating selected must be no less than the sum of 100% of the non-
continuous loads and 125% of the continuous loads (3 hours or more). For OCPDs listed for
operation at 100% of their rating, the calculation for the minimum rating is based on the sum
of 100% of the non-continuous loads and 100% of the continuous loads.
For 100% rated circuit breakers, there are additional UL489 requirements for the wire
connectors/lugs, conductor sizes and types, and minimum enclosure sizing.
