What this MCCB carries — and what it means for your panel
The Siemens 3VA1163-4EF36-0DC0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. That interrupting rating — 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 11.9 kA at 690 V — tells you this breaker can clear a bolted fault up to those levels without welding its contacts or venting into the enclosure. The 800 V rated insulation voltage (Ui) means it's suitable for 480/277 V and 600 V class distribution panels, with headroom above the nominal line-to-line voltage. Three-pole, line-protection version, no communication module, no voltage trigger, no ground-fault monitoring. The auxiliary contact pack is two HQ switches (3VA9608-0BB25) integrated from the factory. The undervoltage release (UVR) is present — so if your safety circuit drops the control voltage, this breaker opens without a separate shunt-trip command.
Footprint and panel fit
Mounts on a DIN rail or direct-panel plate. The 76.2 mm width (three-pole, standard 25.4 mm per pole) and 130 mm height fit the 3VA frame footprint. Depth is 70 mm — that's the dimension from the mounting surface to the front of the breaker, so factor it into your enclosure depth clearance, especially with the rotary handle or door interlock if fitted. Front IP40 rating means the breaker face is protected against tools and small wires >1 mm, but not against water ingress. Keep it inside a panel with a sealed door for washdown environments.
Thermal derating — the real continuous current at your ambient
The TM240 release holds 63 A from 40 °C up to 50 °C. Above that, it derates: 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 your panel ambient runs at 60 °C, you lose about 4 A of headroom — plan your load accordingly rather than relying on the 63 A nameplate.