Siemens SENTRON 3VA1163-3EF32-0CA0 — MCCB with Undervoltage Release
The Siemens SENTRON 3VA1163-3EF32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). It's designed for line protection in distribution panels and motor branch circuits where undervoltage protection is required by code or machine safety logic. The interrupting ratings span the common industrial voltage tiers: 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. That gives you headroom for high-fault utility feeds or transformer secondaries — the 52.5 kA at 415 V covers most European 400 V panelboards without an upstream current-limiting fuse. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V line-to-line systems with margin. The 63 A frame carries its full rating up to 50 °C; above that it derates linearly to 58 A at 70 °C, which matters if you're packing breakers into a sealed, uncooled enclosure.
Dimensions & Panel Fit — 76.2 mm Wide, 70 mm Deep
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep. It mounts on a DIN rail or backplate.
Key Ratings & What They Mean for Your BOM
TM240 overcurrent release: thermal element calibrated for 63 A frame, magnetic pickup at 240 A. Maximum power loss is 19.8 W per pole at rated current — about 60 W total for the 3-pole assembly. That's moderate for a 63 A MCCB; factor it into your enclosure thermal rise calculation if you're grouping multiple breakers in a sealed panel. Operating temperature range: -25 °C to +70 °C. Storage: -40 °C to +80 °C.