The Siemens 3VA1125-6EF32-0BH0 is a 3-pole IEC molded-case circuit breaker on the 3VA1 platform, frame size 160, with a 25 A thermal-magnetic trip unit (TM240, ATAM). Its headline rating is the breaking capacity class H: Icu = 70 kA at 415 V AC. That means it can safely interrupt a fault current up to 70,000 A without welding contacts or rupturing the case — essential for high-fault installations like transformer secondaries or large motor control centers where the available short-circuit current is substantial. The overload protection is adjustable from 18 A to 25 A (Ir), and the instantaneous short-circuit pickup (Ii) is set between 6.4 and 12.8 times In, so you can dial in coordination with downstream breakers.
Integration and panel fit
This breaker ships with a nut keeper kit for secure panel mounting, plus an undervoltage release (UVR) at 24 V DC — a standard safety feature that trips the breaker if control voltage is lost, preventing automatic reclosure. Two auxiliary switches (HQ) and one trip alarm switch (HQ) are factory-installed, so you have status feedback for the PLC or annunciator without adding external relay logic. The 3VA1 frame is designed for DIN-rail or screw-mount integration in a standard distribution panel or motor control center.