The Siemens 3VA1163-4EF36-0AF0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its 121 kA breaking capacity at 240 V means it can safely interrupt fault currents up to that level on a 240 V line without upstream damage — critical for high-fault panels where SCCR headroom is tight. Rated insulation voltage of 800 V and a 3-pole configuration make it suitable for 400/480 V distribution panels as well, with breaking capacity at 415 V at 75.6 kA and at 440 V at 52.5 kA. The TM240 release provides fixed thermal and magnetic trip settings for line protection — no communication function or undervoltage release on this variant.
Breaking Capacity by Voltage
The 3VA1163-4EF36-0AF0 delivers 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. This voltage-dependent curve is typical for MCCBs — the arc-quenching capability drops as line voltage rises, so the 690 V rating (11.9 kA) is the limiting case for high-voltage low-fault installations.
Thermal Derating and Power Loss
The breaker holds 63 A continuously from 40 °C through 50 °C, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. Maximum power loss is 17.3 W. For a panel OEM planning fill factor, the 70 mm depth and 76.2 mm width (3 in) fit standard DIN-rail or panel-mount layouts alongside other SENTRON 3VA devices.
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The trip indicator is present, and the design is line protection (not motor protection or ground-fault monitoring). The supplied basic switch is 3VA11634EF360AA0.