Line protection MCCB — 63 A, 187 kA at 240 V
The Siemens 3VM1163-5GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) configured for line protection — 4-pole, rated 63 A at 40 °C, with a TM220 thermal-magnetic overcurrent release (LI protection function, adjustable li max to 630 A). Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 76 kA at 440 V, tapering to 17 kA at 500 V — meaning it can clear a fault at those levels without upstream coordination failure. The 690 V rated insulation voltage (Ui) covers most low-voltage distribution panels in industrial and commercial buildings.
Thermal derating and panel fit
Current rating holds at 63 A 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 — a gentle slope that keeps the part viable in warm enclosures without oversizing. The 101.6 mm width (4 in) and 70 mm depth (2.8 in) fit standard 4-pole MCCB mounting footprints; front IP40 protection handles typical panel environments. Maximum power loss is 17 W, manageable for thermal budgeting in a crowded DIN-rail or backplate layout.