The Siemens 3VA1510-5EF32-0AD0 is a 3-pole IEC frame 1000 molded-case circuit breaker with a 55 kA interrupting capacity at 415 V (class M). It carries a TM240 thermal-magnetic trip unit — the thermal element adjustable from 700 A to 1000 A, the magnetic pickup fixed at 5× the rated current In. The nut keeper kit and three HQ auxiliary switches come factory-fitted, so you are not sourcing them separately for panel build.
For most industrial distribution boards fed from a 1000 kVA transformer, that is enough headroom to avoid cascading upstream — the breaker clears a bolted fault at the bus without requiring a current-limiting upstream device. The thermal adjustment band (Ir = 700–1000 A) lets you match the cable or busbar ampacity on site; the fixed magnetic pickup at 5× In means instantaneous trip at 5000 A, which is typical for line protection of feeders or large loads where you want to ride through motor starting inrush.