The Siemens SENTRON 3VA2163-5HN36-0BL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with no derating needed up to 50 °C — the full 63 A holds across that range, then steps down to 60.6 A at 55 °C and 53.6 A at 70 °C. That thermal curve matters when you're packing breakers into a warm enclosure: you lose only about 15 % of the rating at the top of the operating band. That means you can coordinate selectivity downstream without swapping hardware — set the I²t on/off and the short-time pickup to match your feeder breaker.
Breaking capacity — where it interrupts and where it doesn't
Rated short-circuit breaking capacity (Icu) runs 187 kA at 240 V, 121 kA at 415/440 V, 79 kA at 500 V, and 4.25 kA at 690 V. The steep drop at 690 V tells you this breaker is sized for 400–500 V distribution — at 690 V it still clears a fault, but the 4.25 kA limit means you need a higher-rated frame if your available fault current exceeds that.
Auxiliaries and releases — what's inside the accessory slot
The integrated undervoltage release is order code 3VA9608-0BB11; the basic switch module is 3VA2163-5HN36-0AA0. Both are replaceable in the field if the coil or contacts fail, though the UVR coil rating needs to match your control supply.
Depth of 86 mm leaves room behind a 200 mm deep enclosure for wiring and the UVR coil.