MCCB for line protection with UVR and auxiliary switching
The Siemens SENTRON 3VA1032-4ED36-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for line-protection duty. Its thermal current rating holds at 32 A from 40 °C through 50 °C ambient, then derates to 31 A at 55–60 °C and 30 A at 65–70 °C — so in a warm enclosure you still get full rated current up to 50 °C, and only a 2 A drop at the top of the range. Breaking capacity is the headline: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That SCCR covers most industrial service-entrance and distribution panels without needing a current-limiting upstream device — the 415 V figure alone handles high-fault utility feeds common in European and Asian plants. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V systems with margin. Power loss at full load is 13.1 W — factor that into the enclosure thermal budget if you are stacking several breakers in a confined panel.
Built-in undervoltage release and auxiliary switch complement
This variant ships with an undervoltage release (UVR) fitted, plus two auxiliary switches and one trip-alarm switch (HQ). The UVR means the breaker trips if control voltage drops below the dropout threshold — common in safety circuits where loss of control power must open the main contacts. The auxiliary switch complement gives remote status for both open/closed and tripped conditions without adding external interface relays. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a 3-pole MCCB footprint that fits standard SENTRON panel cutouts. The 70 mm depth leaves clearance behind a 200 mm deep enclosure door for wiring and finger-safe terminals.