What it is and what it does
The Siemens SENTRON 3VA1163-3EF32-0DC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, meaning it sits at the incoming feeder or main distribution point in a panel and clears faults before downstream branch breakers see the full event. Rated 63 A continuously at 40 °C ambient, with minimal thermal derating up to 70 °C (58 A at 70 °C), so it holds its full rating across typical panel internal temperatures without oversizing. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — high enough for most industrial service-entrance applications where fault current is substantial; the 11.9 kA at 690 V still covers the majority of 690 V distribution systems.
Integration and mounting
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling the backplate. Comes factory-fitted with an undervoltage release (UVR) and two auxiliary switches HQ, so it can signal its open/closed state to a PLC or safety circuit and drop out on loss of control voltage — no field addition needed.
What the ratings mean for your panel
Rated insulation voltage 800 V means it can be used in 690 V systems without de-rating the dielectric clearance — common in mining, marine, and heavy industrial installations. Maximum power loss 19.8 W per pole — three poles total under 60 W — so ventilation in a sealed enclosure is manageable; no forced cooling required for most panel layouts. Operating temperature range -25 °C to 70 °C covers unheated electrical rooms and outdoor cabinets in temperate climates; storage range -40 °C to 80 °C handles cold warehouses and container shipping.