Siemens 3RT1526-1BB40 Molded Case Circuit Breaker

Siemens 3RT1526-1BB40 is a motor control contactor from the 3RT family designed for remote start/stop of three-phase motors in industrial automation. It operates on a 24 V DC coil and carries a 40 A main circuit rating, with an auxiliary contact block that provides 2 normally open and 2 normally closed contacts (2NO+2NC) for interlocking, signaling, and control circuitry. Wiring uses screw terminals, enabling secure field connections for panel-mounted installations. This model is commonly deployed in motor-starting applications such as conveyors, pumps, and fans, where reliable switching of AC loads and coordination with auxiliary circuits are essential. Built for durability and proven Siemens reliability, the 3RT1526-1BB40 pairs a compact footprint with robust switching performance suitable for standard control panels and industrial automation setups. For best compatibility, confirm the exact auxiliary contact configuration and coil voltage against the rest of your motor control scheme and panel catalog before installation.