What this MCCB is and what it carries
The Siemens 3VA1020-2ED36-0CC0 is a SENTRON molded case circuit breaker (MCCB) for line protection, built for three-pole switching at a rated current of 20 A across the 40 °C to 55 °C band — it only starts to derate to 19 A at 60 °C and holds there through 70 °C. It carries a 52.5 kA interrupting capacity at 240 VAC, dropping to 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V — giving you a clear picture of where it can clear a fault without upstream coordination headaches. Rated insulation voltage is 800 V, and maximum power loss sits at 14.5 W, which matters for thermal management inside a sealed enclosure.
Built-in undervoltage release and auxiliary switches
This variant ships with an undervoltage release (UVR) factory-fitted — the UVR trips the breaker when supply voltage drops below a set threshold, which is standard for motor control circuits where you want the breaker open on a brownout. It also includes two auxiliary switches (HQ design) for status feedback to a PLC or indicator lamp, so you don't have to add a separate accessory block for basic open/closed signaling.
Panel fit and dimensions
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON panelboards and distribution blocks without re-drilling the mounting plate. Operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C, so it's happy in unconditioned electrical rooms or outdoor enclosures as long as you stay within those limits.