What this 63 A MCCB delivers — and where it sits in the panel
The Siemens SENTRON 3VA1163-5EF36-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, with a TM240 thermal-magnetic release. It's a line-protection device — meaning it's built to protect cables and distribution buswork, not motor circuits. The interrupting ratings are the headline here: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA at 690 V. That kind of SCCR headroom at 415 V tells you it's sized for high-fault industrial distribution panels where upstream transformer capacity is substantial.
Current derating curve — real-world panel temperature matters
The 63 A rating holds flat up to 50 °C ambient. Above that, it steps down: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, 56.7 A at 70 °C. If this breaker lands in a sealed, high-density panel near other heat sources, that derating is the number that governs your actual load capacity — not the nameplate 63 A. The operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Front protection is IP40, so it's fine for a clean indoor panel but not for washdown areas.
What's on the frame — and what isn't
This version comes with a voltage-trigger shunt trip (STL) and no undervoltage release, no auxiliary contact, no ground-fault monitoring, no communication module, and no phase-failure detection. If your spec calls for an auxiliary contact for status feedback or a UVR for safe-start interlocking, you'd need a different variant in the 3VA family. The TM240 release is a fixed thermal-magnetic curve — not adjustable. The latching endurance is rated at 15,000 operations, which is typical for a distribution breaker not cycled daily.
Panel fit — dimensions and mounting
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. That's a standard 3-pole MCCB footprint for the 3VA frame size. Mounts on a DIN rail or direct-panel with the appropriate accessories. The width is the critical dimension for multi-breaker lineup spacing in a distribution board — 76.2 mm per pole center is typical for this class.