63 A, 4-pole, 75.6 kA — line protection MCCB with undervoltage release
The Siemens SENTRON 3VA1063-3ED42-0BH0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection duty, carrying a continuous 63 A through its TM210 thermal-magnetic release. The interrupting capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — enough to handle high-fault industrial feeders without cascading upstream. The 70 mm depth and 101.6 mm width fit standard panel layouts, and the IP40 front protection keeps dust out of the enclosure face. A built-in undervoltage release (UVR) is wired into the breaker — when line voltage drops below the dropout threshold, the UVR trips the mechanism. That makes this unit a natural fit for motor branch circuits where you need undervoltage protection to prevent automatic restart after a sag. The integrated auxiliary contact version carries 2 auxiliary switches plus a separate trip alarm switch, so the PLC gets both position and fault status without extra wiring.
Derating curve and operating range
The breaker holds its full 63 A rating from 40 °C up through 50 °C ambient. Above that, the thermal element starts pulling back: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your panel runs hot — say a sealed enclosure near a furnace line — factor that 10% drop at the top end. Operating range spans -25 °C to 70 °C, with storage limits from -40 °C to 80 °C.
What the interrupting ratings mean for your panel
The 75.6 kA at 240 V is the highest short-circuit current this breaker can safely interrupt at that voltage — useful for low-voltage distribution near large transformers. At 415 V it still handles 52.5 kA, and at 440 V it drops to 32 kA. At 690 V it's rated 7.5 kA, so if you're feeding a 690 V motor drive, verify the available fault current stays under that threshold. The TM210 release provides thermal protection for overloads and magnetic protection for short-circuits; no ground-fault monitoring or phase-failure detection is built in.