Line protection breaker with 187 kA interrupting capacity
The Siemens SENTRON 3VA1112-5EF32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty. It carries a continuous current rating of 125 A at 40 °C, with the TM240 thermal-magnetic overcurrent release providing fixed pickup and time-delay characteristics. The interrupting capacity reaches 187 kA at 240 VAC, 121 kA at 415 VAC, and 75.6 kA at 440 VAC — figures that place it in a high-fault-current class suitable for main or large-feeder positions in industrial distribution panels.
What the ratings mean for panel fit
The 125 A continuous rating holds across 40 °C to 50 °C ambient without derating; above that it steps down to 120 A at 55 °C and 112.5 A at 70 °C. Per the datasheet, the 187 kA at 240 V is the short-circuit current the breaker can safely interrupt under fault conditions — critical for verifying SCCR compliance on the panel nameplate. The 800 V rated insulation voltage (Ui) covers 480 V and 600 V class systems with margin. Front-side IP40 protection means the breaker face is sealed against tools and solid objects over 1 mm, but not against moisture; suitable for indoor switchgear enclosures.