What it is and where it fits
The Siemens 3VA1063-3ED36-0DH0 is a SENTRON 3VA molded case circuit breaker (MCCB) rated for 63 A continuous current across a 40–50 °C ambient range, with thermal derating starting at 55 °C down to 56.7 A at 70 °C. It is a three-pole, line-protection version carrying a TM210 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). The breaker is designed for DIN-rail or panel-mount installation in distribution boards and industrial control panels, with an IP40 protection rating on the front — meaning it's protected against tools and small wires entering from the front, but not sealed against hose-down or dust ingress.
Breaking capacity — what it handles
This MCCB's interrupting capacity varies significantly with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. The 240 V figure is the highest and tells you it can clear a bolted fault in a 240 V panel without blowing up. At 415 V it still handles 52.5 kA — ample for most industrial distribution. The drop at 690 V to 7.5 kA means if you're on a 690 V system, you need to verify your available fault current stays under that. This is not a universal high-breaking unit; it's sized for the common low-voltage range.
Auxiliary contacts and release
The breaker ships with two auxiliary switches plus one trip alarm switch (HQ configuration). The undervoltage release (UVR) is built in — designed to trip the breaker if supply voltage drops below a threshold, which is standard for safety circuits where a loss of control voltage must open the load. The auxiliary contacts allow remote status monitoring: the alarm switch signals a trip event separately from the aux that tracks the main contact position. No communication module is fitted, so this is a hardwired-only unit.