Siemens 3VA1163-5EF36-0DC0 — SENTRON MCCB, 63 A, 3-Pole, Line Protection
The Siemens 3VA1163-5EF36-0DC0 is a SENTRON-series molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a 3-pole construction designed for line protection. Its interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V — figures that cover high-fault utility feeds and large motor branch circuits without needing a current-limiting fuse upstream. The unit ships with an integrated undervoltage release (UVR) and two HQ auxiliary switches, so it arrives ready for remote trip indication and undervoltage protection in a single package.
Ratings and What They Mean for Fit
The 63 A rating holds across 40 °C to 50 °C ambient without derating; at 70 °C it still carries 58 A. That thermal curve matters when the breaker sits in a crowded panel — you can load it to nameplate at typical enclosure temperatures without oversizing. The 187 kA at 240 V is a high-interrupting rating for a 63 A frame, meaning this breaker can be applied on the secondary of a large transformer or at a service entrance where available fault current is substantial, without needing a series-rated combination. The 800 V rated insulation voltage (Ui) confirms the breaker is suitable for 480 V and 600 V class systems with margin; the 17 kA rating at 690 V extends its use into 690 V industrial networks common in mining and marine installations.
Built-In Auxiliaries and Release
This variant includes an undervoltage release (UVR) and two HQ auxiliary switches as standard — no separate order or field-fit kit needed. The UVR drops the breaker on loss of control voltage, which is a typical requirement for safety circuits and emergency-stop chains. The two auxiliary switches provide status feedback (open/closed) to a PLC or indication lamp, saving a DIN-rail terminal block and a wiring step.
Physical Fit and Panel Integration
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole frame that fits standard Siemens 3VA1 panel cutouts and busbar systems. The 76.2 mm width is three 25.4 mm pole pitches, matching the common 25 mm modular grid for DIN-rail or direct-mount enclosures. Depth of 70 mm leaves room behind the panel for wiring and busbar connections without forcing a deeper enclosure.
Power Loss and Thermal Management
Maximum power dissipation is 19.8 W at rated load. In a sealed enclosure with multiple breakers, that heat adds up — plan for ventilation or derating if the panel ambient exceeds 50 °C. The operating temperature range of -25 °C to 70 °C covers most indoor industrial environments.