Three poles handle three-phase circuits.
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V tells you this breaker is optimized for low-voltage distribution up to 600 V class — typical for North American 480/277 V or European 400/230 V networks where the available fault current can hit 100 kA+ at the main. At 690 V (common in mining or marine), the 3.7 kA rating means it belongs downstream of a higher-rated feeder breaker, not at the service entrance.
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard footprint for a 3-pole 100 A frame in the SENTRON 3VA platform. Power loss is rated at a maximum of 10 W, so heat dissipation inside a sealed enclosure is manageable — no forced cooling required for a single unit, though a group of breakers in a tight panel should be spaced per Siemens' derating guidelines.