The Siemens 3VA1125-6EF32-0HA0 is a SENTRON 3-pole molded case circuit breaker rated 25 A at 40 °C, designed for line protection in distribution panels. It carries a shunt trip (STL) auxiliary release for remote tripping — useful in emergency-stop or undervoltage-coordination circuits where a control signal must open the breaker independently of the overcurrent mechanism.
Breaking capacity and selectivity
Breaking capacity is voltage-dependent: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. That 220 kA figure at 240 V gives headroom for high-fault industrial panels where upstream transformer impedance is low. At 690 V the 17 kA rating is typical for a 25 A frame — check the available fault current at your secondary before committing the BOM line.
Thermal-magnetic release and derating
The overcurrent release is a TM240 thermal-magnetic type. Rated current holds at 25 A from 40 °C through 50 °C, then steps down to 24 A at 55–60 °C and 23 A at 65–70 °C. Insulation voltage is rated 800 V. Maximum power loss is 8.5 W — negligible for panel thermal budgeting but worth noting if the breaker is enclosed in a small non-vented box.
Physical fit
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 3-pole width (three 25.4 mm modules) fits standard DIN-rail or panel-mount cutouts for SENTRON 3VA frames. No communication function, no undervoltage release, no ground-fault monitoring on this variant — it is a straightforward line-protection MCCB with a shunt trip.