The Siemens 5SL4308-7RC is a 3-pole miniature circuit breaker from the SENTRON 5SL series, rated 8 A with a C tripping characteristic and a 10 kA breaking capacity per EN 60898.
The 3-pole configuration (3P) switches all three phases simultaneously, so a fault on any one phase opens the whole circuit. Single-phase operation is rated at 250 V AC, and the DC rating is 72 V — useful for DC sub-circuits in mixed panels. Mechanical endurance is 10,000 switching cycles — adequate for panel isolation duty where it's cycled a few times a year.
Physical fit and mounting
Width is 18 mm (1 modular unit per pole, so 3 modules wide for the 3-pole unit).
Construction and compliance details
Halogen-free and silicon-free construction, sealable for tamper-proofing in metered installations. Touch protection is built in. Pollution degree 2, overvoltage category III — suitable for fixed-installation downstream of the service entrance.