What it is and where it fits
The Siemens 3VA1020-4ED36-0CC0 is a SENTRON molded case circuit breaker (MCCB) built for line protection in industrial distribution panels. It carries a 20 A continuous rating across ambient temperatures from 40 °C to 50 °C without derating, then steps down to 18 A at 70 °C — a curve that matters when the breaker lives next to hot busbars in a sealed enclosure. Breaking capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and still holds 11.9 kA at 690 V — figures that cover most low-voltage fault scenarios in mining and mill distribution without needing a current-limiting upstream device. The TM210 thermal-magnetic trip unit handles overload and short-circuit protection; no electronic communication or phase-failure detection here — it's a pure protective device, not a monitoring node.
Panel fit and integration
Three-pole design, 76.2 mm wide, 130 mm tall, 70 mm deep — fits the standard MCCB footprint on a DIN rail or direct-mount plate. The IP40 front protection means it's fine inside a clean panel but not for washdown zones. Comes with two auxiliary switches (HQ type) and an undervoltage release (UVR) — the UVR is wired into the control circuit so the breaker drops out on loss of control voltage, typical for safety-related disconnects on conveyors or crushers. Rated insulation voltage Ui is 800 V, which gives headroom for 690 V systems without degrading the dielectric margin.