The Siemens 3VA1332-5EF42-0BB0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, carrying 320 A continuously at 40 °C with no derating needed up to 50 °C. Its 187 kA interrupting capacity at 240 V gives generous SCCR headroom for most industrial distribution panels — you can back it with a transformer or a large generator bus without worrying about cascading failure upstream.
Breaking capacity and selectivity
At 415 V it clears 121 kA, same at 440 V. That drops to 75.6 kA at 500 V and 11.9 kA at 690 V. For a 4-pole breaker this means you can use it on 400 V three-phase systems with high fault current — common in large motor control centers or transformer secondaries — without needing a current-limiting fuse upstream. The 800 V rated insulation voltage confirms it's built for 690 V line-to-line applications, not just 400 V.
Auxiliaries and releases
This variant ships with an undervoltage release (UVR) and two auxiliary switches (HP design). The UVR trips the breaker when control voltage drops — standard for emergency-stop circuits or undervoltage protection on motor feeders. No ground-fault monitoring module is included; if you need GF protection, that's a separate accessory. The trip indicator is not fitted, so you won't get a visual flag on the front — factor that into your panel inspection routine.