The Siemens 3VA1120-5GF46-0AA0 is a 4-pole SENTRON molded case circuit breaker (MCCB) rated 20 A continuous at 45 °C, with a TM240 thermal-magnetic release. The interrupting ratings tell the story: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V or 690 V. The TM240 release has an adjustable li max of 320 A, so you can dial the magnetic trip to coordinate downstream.
This breaker holds 20 A from 45 °C up to 55 °C without derating. At 60 °C it steps to 19 A, and holds that through 70 °C. That's a tight thermal curve — you lose only 5 % of capacity over the full operating range. The maximum power loss is 12 W, which is low for a 4-pole MCCB at this frame size.
Dimensions are 101.6 mm wide, 130 mm tall, 70 mm deep — a standard 4-pole MCCB footprint for panel mounting. The N-conductor protection is rated 100 %, meaning the neutral pole is fully rated, not reduced. A motor drive option is available as an accessory for remote tripping or charging. No communication function onboard — this is a standalone breaker, not a smart metering device.