MCCB with a thermal-magnetic release and a derating curve you need to read
The Siemens 3VM1163-4GE42-0AA0 is a SENTRON molded case circuit breaker designed for line protection, with four poles and a TM220 thermal-magnetic overcurrent release. At 40 °C it carries 63 A continuously, and the derating is minimal up to 50 °C — still 63 A — then drops to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. That curve matters if this breaker sits in a warm enclosure or next to other heat sources; the 17 W maximum power loss adds to the internal heat load. Breaking capacity is rated 121 kA at 240 V, 76 kA at 415 V, 53 kA at 440 V, and 12 kA at 500 V — so the available fault current at the panel location determines which voltage column governs the selection. Rated insulation voltage is 800 V, and the N-conductor is protected at 100 %.
Physical fit and panel integration
The case measures 130 mm high, 101.6 mm wide, and 70 mm deep. Front protection is IP40, so it keeps out tools and fingers but is not sealed against moisture — standard for panel-mounted MCCBs. No undervoltage release, no trip indicator, no communication function, and no ground-fault monitoring on this variant.