The Siemens 5SL4303-7RC is a 3-pole miniature circuit breaker from the SENTRON 5SL4 design, rated 3 A with a C tripping characteristic and a 10 kA breaking capacity at 415 V AC per EN 60898.
Voltage and duty
Rated supply voltage is 415 V AC; multi-phase operation goes up to 440 V AC, single-phase to 250 V AC. DC rating tops out at 72 V — useful if you're feeding a DC bus or control circuit, but the primary application is AC branch-circuit protection. Mechanical life is 10 000 switching cycles typical.
Mounts in any position on standard DIN rail. Sealable, halogen-free, silicon-free. Energy limiting class 3 means it lets through less energy during a fault than class 1 or 2 breakers, helping downstream coordination.