The Siemens SENTRON 3VA2010-6HL32-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from -25 °C to 70 °C — no derating needed up to the enclosure's thermal limit. It's designed for line protection in distribution panels, with a 242 kA interrupting capacity at 240 V and 187 kA at 415/440 V, giving you serious fault-current headroom for high-capacity transformer feeds or bus risers.
The 242 kA at 240 V and 187 kA at 415 V are the maximum short-circuit withstand; in practice, you coordinate downstream breakers so the 3VA opens before upstream gear sees the full fault. The 3 kA rating at 690 V is a reminder this is a 600 V class breaker — don't push it above that voltage for fault clearing.
The 86 mm depth leaves clearance for rear-mounted bus bars or cable ducts.