Allen-Bradley 1492-SPM1C040 is a Bulletin 1492-SPM supplementary circuit breaker—a 1-pole, current-limiting protector with a 4 A rating and a C-trip curve. As part of the 1492-SPM family, it provides short‑circuit protection in control panels and machine circuits and features dual terminals for wiring or busbar connections. The standard model is specified without a neutral (No Neutral), while a neutral-equipped variant exists as 1492-SPM1C040-N. These devices are thermal-magnetic supplementary protectors used to add localized protection while maintaining compatibility with main breakers in industrial panels.
