Siemens 5SL3505-7 SENTRON MCB, 0.5 A, C-curve
The Siemens 5SL3505-7 is a 1P+N miniature circuit breaker from the SENTRON 5SL series, rated at 0.5 A with a C tripping characteristic.
At 0.5 A, this MCB protects a very low-current circuit — think control transformers, small signal supplies, or a single lighting branch with a handful of LED fixtures. That is common in single-phase final circuits where you want to isolate both poles for safe maintenance. Rated voltage is 230 V AC (single-phase operation up to 250 V AC), so it drops straight into a standard 230 V residential or light commercial distribution board.
Panel integration and installation
The 5SL3505-7 occupies 2 width units (36 mm) on a DIN rail, with an installation depth of 70 mm and overall depth of 76 mm. Terminal capacity accepts solid or stranded conductors from 0.75 mm² up to 25 mm², and the tightening torque range is 2.5–3 N·m. It is sealable, halogen-free, and silicon-free — relevant for installations where outgassing or contamination must be controlled (e.g., medical or clean-room environments). IP20 with connected conductors; mounting position any, so it fits in horizontal or vertical panel layouts.