ABB ST201M-B16NA Two-Channel Safety Relay Module

ABB ST201M-B16NA is a DIN-rail mounted miniature circuit breaker rated for 16 A and 480Y/277 V, with a 10 kA short-circuit breaking capacity and a B-curve trip characteristic. Listed under UL 1077 for control circuitry protection, it safeguards individual circuits within industrial panels and automation installations. This compact device fits standard DIN-rail distribution and is suitable for ABB System Pro M Compact or similar panel systems, protecting automation components such as relays, PLC I/O, sensors, and other control equipment. Common applications include protection of branch circuits in machine controls, building management panels, and other electrical enclosures where reliable overcurrent protection is required. The B-curve profile trips at relatively low overcurrents, providing predictable protection for typical automation loads while minimizing nuisance trips on startup transients. Key specifications include 16 A nominal current, 480Y/277 V rated voltage, 10 kAIC short-circuit rating, B-curve, UL 1077 listing, and DIN-rail mounting.