The Siemens 3VA1140-3EF36-0BH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries a continuous current of 40 A at 40 °C ambient, derating to 37 A at 70 °C, per the thermal curve. The 3-pole design and 800 V rated insulation voltage suit it for 400/480 VAC three-phase feeder circuits where the interrupting rating is the binding constraint.
Breaking capacity across system voltages
The interrupting rating varies with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a 480 V panel with a 25 kA available fault current, this breaker provides headroom; at 690 V the 11.9 kA rating is the limit to verify against the utility's service fault level.
Integrated auxiliary and undervoltage release
Factory-fitted with two auxiliary switches plus one trip alarm switch (HQ), and an undervoltage release (UVR). The UVR trips the breaker when control voltage drops below its dropout threshold — typical for emergency-stop chains or undervoltage protection schemes. The auxiliary contacts provide status feedback to a PLC or indication lamp without external interposing relays.