The Siemens SENTRON 3VA4120-5ED24-0AA0 is a 2-pole molded-case circuit breaker rated 20 A at 40 °C ambient, with a TM210 thermal-magnetic overcurrent release. At 600 Y/347 V it still holds 18 kA, so it handles common North American wye configurations without derating the SCCR. That simplifies specification: what you see on the nameplate is the continuous current, and the magnetic pickup is factory-set. For a system-protection role (per the product design), this is intentional — fewer variables in a coordination study.
At 50 °C it derates to 19 A, at 60 °C to 18 A, and at 70 °C to 17 A.
Dimensions: 50.8 mm wide (2 in), 129.4 mm high (5.09 in), 75.1 mm deep (2.96 in). The 2-pole width matches a standard 2-module DIN-rail footprint.