What this MCCB delivers in the panel
The Siemens SENTRON 3VA2125-6HL46-0AA0 is a 4-pole molded case circuit breaker rated for 25 A continuous current, with an ETU320 electronic trip unit. It is designed for line protection in distribution panels and switchgear assemblies. The 242 kA breaking capacity at 240 V means it can safely interrupt very high fault currents without cascading upstream — a critical spec for high-available fault-current installations like transformer secondaries or large motor control centers.
Breaking capacity across voltage levels
Breaking capacity drops with voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V means this breaker is not a primary choice for 690 V three-phase systems unless the fault current is well-characterized below that level. For 400/415 V panels, the 187 kA rating covers most industrial service-entrance and sub-distribution applications.
Thermal performance and operating range
Rated continuous current holds at 25 A across the full ambient range from 40 °C to 70 °C — no derating needed up to 70 °C ambient. Operating temperature spans -25 °C to 70 °C, storage from -40 °C to 80 °C. The 0.6 W maximum power loss is negligible for panel thermal budgeting. Front-side IP40 protection keeps dust out of the breaker face; the rest of the enclosure must provide the overall panel IP rating.