Two normally open, two normally closed (2NO-2NC) auxiliary contact switch used in Cutler-Hammer K-frame breakers. This switch is used to indicate circuit breaker status, and is used for remote signaling and system interlocking purposes. UPC#78667928166. Install in any ED, EHB, HFD, FDB, FD and FDC series C Circuit breakers. 1490D72G14 .