The Siemens 3VA1063-4ED32-0BH0 is a SENTRON molded case circuit breaker (MCCB) rated 63 A at 40 °C, configured as a 3-pole line-protection device. Its 121 kA interrupting capacity at 240 V gives substantial fault-current headroom for most industrial panelboards — the SCCR rating that governs whether this breaker clears a bolted fault without welding its contacts or rupturing the case. Rated insulation voltage is 800 V, so it comfortably covers 480 V and 600 V class systems.
Breaking capacity across voltages
The interrupting rating drops as system voltage rises: 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. For a 480 V panel, the 52.5 kA figure at 440 V is the closest reference — expect a similar value at 480 V. That 11.9 kA floor at 690 V is still adequate for most 690 V industrial loads, but verify against the available fault current at the point of installation.
Thermal derating and ambient limits
The breaker holds full 63 A rating from 40 °C through 50 °C. Above that, it derates linearly: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. Operating ambient range is -25 °C to 70 °C; storage range extends -40 °C to 80 °C. Maximum power loss is 19.8 W — negligible for panel thermal budgeting but worth noting if the breaker is enclosed in a small, sealed sub-panel.
Integrated auxiliaries and releases
This variant ships with an undervoltage release (UVR) and a complement of two auxiliary switches plus one trip-alarm switch (HQ). The UVR trips the breaker when control voltage drops below a threshold — standard for emergency-stop circuits or undervoltage protection schemes. The auxiliary switches provide status feedback to a PLC or annunciator panel. No ground-fault monitoring or communication module is included; those are separate option add-ons.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width is a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. Verify the mounting hole pattern against the existing backplate — the 70 mm depth leaves clearance behind a standard 200 mm deep enclosure door.