Breaking capacity is 121 kA at 240 V and 75.6 kA at 415 V, giving the breaker headroom for high-fault installations like main feeders or transformer secondaries where SCCR must coordinate with upstream gear. The 70 mm depth, 140 mm width, and 158 mm height fit the standard SENTRON 3VA footprint — direct swap into existing Siemens MCCB panel layouts without re-drilling gland plates or reworking bus connections. Max power loss is 57 W, which matters for thermal rise inside a sealed enclosure.
Current derating and ambient limits
Above that, derating is gradual: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C.
Auxiliary switching and accessories
This variant ships with four HQ auxiliary switches (design of the auxiliary switch: 4 auxiliary switches HQ). The supplied basic switch order code is 3VA12254EF420AA0, which is the core MCCB module before auxiliary additions. No trip indicator or voltage trigger is fitted.