Are all circuit breakers suitable for reverse feed (fed from the bottom) applications?
In general, reverse feed applications are limited to circuit breakers with non-interchangeable trip units which have been specifically tested for incoming power connected at the ‘bottom’ or ‘load’ end. Most of the non-interchangeable breakers, including the Siemens SENSITRIP™ electronic breakers can be reverse fed. UL says that a breaker must be specifically marked “LINE” and “LOAD” as necessary if it fails to pass the reverse feed test. In the Siemens 2004 SPEEDFAXTM, footnotes show the appropriate listings, but the final word should be the markings on the breaker itself.
