The Siemens 3VA2510-5HL32-0CA0 is a SENTRON molded case circuit breaker rated for continuous current Iu of 1000 A at 40 °C ambient, with no derating needed up to 55 °C — it holds the full 1000 A across that band. That means for a panel running warm near a transformer or drive bank, you keep nearly full ampacity without stepping up a frame size. The interrupting ratings are the headline: 187 kA at 240 V, 121 kA at 415 V, and 53 kA at 690 V. For a 415 V distribution board with a high available fault current, this one handles it without cascading upstream. The adjustable instantaneous pickup (li) ranges from 1500 A to 10000 A, giving you selectivity headroom downstream.
Dimensions are 320 mm high, 210 mm wide, 120 mm deep. That depth is the key constraint for shallow backpanels or gland-plate clearance — at 120 mm it fits most standard distribution boards without a deep enclosure. Maximum power loss is 123 W at rated current.