The Siemens SENTRON 3VA1120-5EE42-0AA0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection, carrying a 20 A continuous rating at 40 °C and a TM220 thermal-magnetic overcurrent release.
The 20 A rating holds flat from 40 °C up to 55 °C, then derates to 19 A at 60 °C and above — so in a warm enclosure you lose only 1 A, not a full trip threshold. The TM220 release gives a fixed thermal curve with magnetic pickup around 10x In, typical for motor or general distribution branch circuits where short-circuit coordination, not nuisance tripping, is the priority. Rated insulation voltage is 800 V, and the interrupting ratings step down as voltage climbs: 75.6 kA at 440 V, 17 kA at 500 V and 690 V.
No end-of-life notice or successor has been issued. That's one less SKU to worry about for the next five years.
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — a 4-inch-wide body that fits standard Siemens 3VA panel-mounting patterns.