What this 63 A MCCB delivers in the panel
The Siemens 3VA1163-6EF36-0BA0 is a SENTRON molded case circuit breaker built for line protection in 3-pole, 63 A continuous duty. It carries a TM240 thermal-magnetic overcurrent release — that fixed thermal element handles sustained overloads, the magnetic trip clears short-circuits. Breaking capacity hits 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V; at 690 V it still manages 17 kA. That kind of headroom matters when you're coordinating downstream protection in a high-fault industrial distribution board — the breaker stays intact and clears the fault before the upstream transformer trips. The built-in undervoltage release (UVR) means this breaker drops out when supply voltage falls below a set threshold — useful on motor feeders where you want to prevent automatic restart after a sag. Rated insulation voltage is 800 V, so it's comfortable on 480/600 V class systems. Ambient operating range runs from -25 °C to 70 °C, with full 63 A rating holding up to 50 °C; above that it derates stepwise to 56.7 A at 70 °C. Storage range is wider: -40 °C to 80 °C, which covers most job-site conditions before the panel is energized. Front protection is IP40 — fine for a clean indoor panel, but if this breaker is going into a washdown area or a dusty MCC room, the IP40 front means you keep the enclosure door closed. Depth is 70 mm, width 76.2 mm, height 130 mm, so it fits standard SENTRON 3VA1 panel cutouts and busbar arrangements without rework.
Panel fit and integration notes
This 3-pole MCCB snaps onto a standard DIN rail or mounts via the rear panel cutout — the 70 mm depth and 76.2 mm width match the SENTRON 3VA1 family footprint. No auxiliary contacts are fitted from the factory (auxiliary contact version: without), so if you need status feedback to a PLC, plan to add the external auxiliary trip block (order code 3VA9608-0BB11). The undervoltage release is internal, wired separately to a control voltage. No communication function or phase-failure detection on this variant — it is a thermal-magnetic breaker with UVR, no electronics. If your design calls for Modbus or ground-fault monitoring, step up to a 3VA1 with the electronic release option.