The Siemens SENTRON 3VA1125-5EF32-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a continuous current of 25 A at 40 °C ambient, with no derating needed up to 50 °C — still 25 A — then steps down to 24 A at 55 °C and 23 A at 70 °C. That thermal curve means it holds full rating across most standard panel environments without oversizing.
Breaking capacity and selectivity
Breaking capacity is the headline number for this class: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA at 690 V. Those figures let it sit upstream in a high-fault installation — think industrial switchgear or a transformer secondary — where a standard 25 A frame would need a current-limiting upstream breaker. The 690 V rating at 17 kA is worth noting for 600 V class北美 systems; it clears faults without cascading.
Built-in shunt trip and auxiliary switches
This variant ships with a shunt trip release (STL) for remote tripping and two HQ auxiliary switches for status feedback to a PLC or annunciator. The shunt trip lets a safety relay or emergency-stop circuit kill the breaker without a manual operator — common on motor control center feeders or remote-disconnect panels. No undervoltage release or ground-fault module on this build; those are separate order-code variants.
Physical fit and panel integration
Footprint: 76.2 mm wide (3 in), 130 mm tall, 70 mm deep. That is a standard 3-pole MCCB width for the 3VA frame — it drops into the same DIN-rail or screw-mount cutout as other 3VA1 breakers. Depth of 70 mm means it clears most shallow enclosures; verify the door swing if using a rotary handle extension.
Electrical ratings and power loss
Rated insulation voltage is 800 V, giving headroom for 690 V systems. Maximum power loss at rated current is 8.5 W — low enough that ventilation in a typical panel handles it without forced cooling. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.