The Siemens 3VA1510-5EF32-0JL0 is a SENTRON molded case circuit breaker rated for line protection, with a continuous current of 1000 A at 40 °C through 50 °C, derating to 900 A at 70 °C. Three poles, 800 V insulation voltage, and a maximum power loss of 330 W. Interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 52.5 kA at 690 V — figures that govern fault-clearing in high-available-fault-current distribution panels.
Interrupting ratings and thermal derating
The 187 kA at 240 V and 121 kA at 415 V/440 V are the headline SCCR values — high enough to coordinate with most upstream transformers and downstream branch breakers without cascading failure. Thermal derating starts at 55 °C: 960 A at 55 °C, 940 A at 60 °C, 920 A at 65 °C, 900 A at 70 °C.