What it is and what it does
The Siemens 3VA1010-3ED36-0DH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. Three-pole, rated 100 A continuous at 40 °C, it carries a 75.6 kA breaking capacity at 240 V AC — that's the fault current it can safely interrupt without welding contacts or rupturing the case. The 800 V rated insulation voltage means it's built for 480 V and 600 V class systems with margin.
Breaking capacity and derating — the real numbers
Breaking capacity drops with system voltage: 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 500 V and 690 V (–). If your fault current at the panel is 50 kA at 480 V, this breaker holds — at 500 V you need to check coordination. The thermal derating curve is flat to 50 °C (100 A), then drops to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C (–). Mount it in a ventilated enclosure; the 27.5 W max power loss adds heat inside the cabinet.
Built-in auxiliaries and release
Factory-fitted with an undervoltage release (UVR) and two auxiliary switches plus a trip alarm switch (HQ). The UVR drops the breaker when control voltage falls — standard for emergency-stop circuits or undervoltage protection on motor feeders. The trip indicator gives local mechanical flag status. No communication function — this is a standalone thermal-magnetic MCCB, not a power-metering breaker.
Physical fit and environment
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth (–). That's a standard 3-pole MCCB footprint — mounts on a DIN rail or directly to a backplate. Operating temperature range -25 °C to 70 °C; storage from -40 °C to 80 °C. The 70 mm depth is shallower than many older MCCB designs, which helps in tight enclosures.