Allen-Bradley 1492-SPM2D040 Circuit Breaker

Allen-Bradley 1492-SPM2D040 Supplemental Circuit Breaker is a compact two-pole miniature protective device in the 1492-SPM family, engineered to add overcurrent protection to electrical control panels. It carries a 4 A rating and uses Trip Curve D, with no neutral terminal. As a supplemental protector, it is designed to provide additional protection for control circuits or interlock logic without replacing the main protection scheme, making it suitable for industrial automation applications where coordinated protection of small, low-current circuits is required. The unit is identified by Bulletin 1492-SPM and, according to manufacturer and distributor specifications, supports a 10 kA breaking capacity under UL 1077 listings, reinforcing its suitability for panel installations where reliable fault interruption is critical.