What this MCCB is and what it does
The Siemens 3VA1010-3ED32-0CH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a rated current of 100 A at 40 °C ambient, with no derating needed up to 50 °C — at 55 °C it still holds 98 A, and at 70 °C it delivers 91 A, so it handles warm enclosures without a frame-size jump. Breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — figures that cover most commercial and light-industrial fault levels. At 500 V and 690 V it still interrupts 7.5 kA, so it can serve 480Y/277 V panels with adequate SCCR headroom. The 3-pole frame includes an undervoltage release (UVR) and a factory-fitted auxiliary switch configuration: 2 auxiliary switches plus 1 trip alarm switch HQ. The trip indicator is present, so a quick visual check confirms whether the breaker tripped on fault versus being manually opened.
Sizing and panel fit
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a standard SENTRON 3VA frame footprint that drops into existing DIN-rail or panel-mount cutouts without re-drilling. Rated insulation voltage is 800 V, and maximum power loss is 27.5 W, so ventilation in a sealed enclosure is advisable but not mandatory at the 100 A rating. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The breaker is designed for line protection — no communication function, no ground-fault monitoring, no voltage trigger. It is a straightforward thermal-magnetic MCCB with the UVR as the only auxiliary release.