The Siemens 3VA1020-4ED36-0AD0 is a 3-pole SENTRON molded case circuit breaker rated for line protection, carrying a TM210 thermal-magnetic release and a continuous current of 20 A across the 40 °C to 55 °C ambient range, derating to 19 A at 65 °C and 70 °C. Its breaking capacity reaches 121 kA at 240 VAC, 75.6 kA at 415 VAC, 52.5 kA at 440 VAC, and 11.9 kA at both 500 VAC and 690 VAC — figures that tell you this breaker clears high fault currents without cascading upstream, which is what matters when you're coordinating a feeder in a dusty MCC room where the ambient runs hot and the fault current is real.
The 3VA1020-4ED36-0AD0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-inch-wide footprint that matches the standard SENTRON 3VA platform, so it drops into the same DIN-rail or screw-mount pattern as other 3-pole units in the family.