ABB ST201M-B30 Industrial Relay Module For Control Systems

ABB ST201M-B30 is a 1-pole miniature circuit breaker from ABB’s ST200M protection family, engineered to deliver reliable overcurrent protection for single‑phase control circuits in industrial automation and machine control panels. It is rated at 30 A with a B‑curve trip characteristic, providing predictable protection for moderate overloads while accommodating typical control‑circuit startup currents. The device is UL 1077 listed and supports a nominal voltage up to 480Y/277 V AC, with an interrupting capacity of 10 kA at that voltage, making it suitable for standard North American distribution and control panels. The ST201M-B30 is available in regional variants such as ST201M-B30NA to reflect North American catalog configurations and wiring practices. As a plug‑in style protection device, it is designed for installation in compatible enclosures or panels where single‑pole protection is required on a dedicated feed for control equipment, sensors, or actuators. This part number sits within ABB’s ST200M family and is commonly listed alongside other miniature circuit breakers in electrical catalogs and distributor listings, confirming its role as a standard, widely supported protection element in modern control systems.