MCCB for line protection — 100 A frame, 121 kA interrupting
The interrupting capacity hits 121 kA at 240 V, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V, which gives solid selectivity headroom for downstream branch breakers in high-fault industrial services. That means it can signal its status to a PLC or safety relay without a separate add-on module — useful for motor control centers where loss-of-voltage tripping must be annunciated.
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole frame that fits standard Siemens SENTRON mounting bases and busbar systems. Maximum power dissipation is 27.5 W, so thermal rise inside a sealed enclosure should be checked against the panel's heat budget.