Nonadjustable Circuit Breaker : A circuit breaker that does not have any adjustment to alter the value of current at which it will trip or the time required for its operation
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}