What this MCCB delivers — and what it skips
The Siemens SENTRON 3VA1025-4ED32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 25 A, with a TM210 thermal-magnetic overcurrent release. It carries a shunt trip (STL) auxiliary release — the integrated auxiliary trip is order code 3VA9688-0BL30 — but no undervoltage release, no auxiliary contact, no communication module, and no ground-fault monitoring. The interrupting capacity hits 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That 121 kA at 240 V is the headline figure: it means this breaker can safely clear a fault up to that level on a 240 V line without welding its contacts or rupturing the case — critical for high-fault panels feeding motor control centers or transformer secondaries.
Thermal derating — when the panel runs hot
Rated 25 A continuous from 40 °C through 50 °C ambient. At 55 °C it derates to 24 A, at 60 °C to 23.5 A, at 65 °C to 23 A, and at 70 °C to 22.5 A. If your panel sits near a heat source or in a non-ventilated enclosure, size the load to the derated figure — not the 25 A nameplate. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Panel fit — dimensions and mounting
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. Front protection is IP40. It mounts on a DIN rail or panel-mount base within the SENTRON 3VA family footprint.
What it protects — line protection duty
Product version is line protection — not motor protection or generator protection. The TM210 release is a thermal-magnetic type: thermal element handles overloads (inverse-time curve), magnetic element handles short-circuits (instantaneous). No phase-failure detection, no undervoltage release, no communication. It is a straightforward feeder breaker for distribution panels, sub-distribution boards, or as a main disconnect for a control cabinet. The rated insulation voltage Ui is 800 V, so it is rated for 690 V systems.