Allen-Bradley 1492-SPM3D400 Supplementary Protector 3P 30A

Allen‑Bradley 1492‑SPM3D400 is a 3‑pole supplementary protector (MCB) rated for 40 A, designed to provide overcurrent protection in equipment where branch circuit protection is already in place. This No Neutral variant features Trip Curve D for both enduring and instantaneous protection, making it suitable for motor controls and control panels within 480Y/277 V AC three‑phase systems. As part of the 1492‑SPM family, it carries Bulletin 1492‑SPM designation and is specified for overcurrent protection in equipment with existing main protection; its UL 1077 ratings indicate interrupting capacities of up to 10 kA at currents up to 32 A and 5 kA above 32 A. The 1492‑SPM3D400 is offered without a neutral conductor (No Neutral), with neutral‑inclusive options available in other variants (such as the -N versions) to fit different panel designs. Typical applications include providing secondary protection in industrial control cabinets, automation enclosures, and other machinery where a supplementary protector is used to enhance circuit protection without replacing the primary branch circuit device.