The Siemens SENTRON 3VA1125-5EE32-0BF0 is a 3-pole molded case circuit breaker rated 25 A continuous at 40 °C, with an interrupting capacity of 187 kA at 240 V AC. The interrupting curve drops to 121 kA at 415 V and 75.6 kA at 440 V, so verify the available fault current at your service voltage before committing the BOM line. This is a line-protection design — not a motor-protective breaker with integrated overloads. It sits upstream of a motor starter or downstream of a main breaker, clearing short-circuits while leaving overload coordination to a separate thermal-magnetic or electronic relay. The built-in undervoltage release (UVR) drops the breaker open when control voltage falls below a set threshold, which is useful for safety circuits that need to guarantee a de-energized state on power loss.
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard SENTRON 3VA1 footprint that fits existing DIN-rail or screw-mount panel layouts. The auxiliary switch and trip alarm switch (1 each, HQ design) snap into the accessory slot on the left side; wire them before the breaker is bolted in for easier access. Ambient temperature derating is minimal up to 50 °C — still 25 A — then drops to 24 A at 55 °C and 23 A at 70 °C. If the panel runs hot (say, crowded with drives or transformers), size the load at the 70 °C figure, not the 40 °C nameplate.
What's on the nameplate
The breaker ships with a trip indicator (mechanical flag on the handle) so a technician can see at a glance whether it tripped on fault versus being manually switched off. There is no voltage trigger, no communication function, and no ground-fault monitoring version on this variant — it is a straightforward line-protection MCCB with undervoltage release and one auxiliary plus one alarm switch. The supplied basic switch is order code 3VA11255EE320AA0. Maximum power loss is 11 W, which matters for enclosure heat load calculations when multiple breakers are ganged.