Siemens 3VA4120-4ED14-0AA0 Single Pole 20 Amp Circuit Breaker

Siemens Sentron 3VA4120-4ED14-0AA0 is a 1-pole, 20 A molded-case circuit breaker in the 3VA4 UL frame, designed to provide primary overcurrent protection in low-voltage distribution panels. It uses a TM210 thermal-magnetic trip unit (FTFM) and delivers a short-circuit breaking capacity of 25 kA at 277 V AC, with overload protection rated Ir = 20 A and fixed short-circuit protection Ii = 15 × In. In normal operation, the device is rated for 40–45°C ambient temperature with In = 20 A and derates to 19 A at 50°C, 18 A at 60°C, and 17 A at 70°C; it is a Class S protective device suitable for line protection in Siemens Sentron 3VA installations.