Siemens 5SL4414-8CC Miniature Circuit Breaker – 400V 10kA, D-Curve, 0.3A
The Siemens 5SL4414-8CC is a 4-pole miniature circuit breaker rated at 400 V with a 10 kA breaking capacity, D-trip characteristic, and a 0.3 A current rating. This part sits in the Siemens 5SL4 Basic Devices family, designed for DIN-rail mounting in distribution boards and control panels where overcurrent and short-circuit protection of low-current circuits is needed. The D-curve (10-20x In) makes it suitable for loads with high inrush currents such as small transformers, solenoid valves, or motor starters where nuisance tripping on startup must be avoided.
Compliance Documentation
The 5SL4414-8CC has been RoHS-compliant since June 1, 2013. Under REACH Article 33, the part contains lead (CAS 7439-92-1) above the 0.1% threshold in the candidate list, which is standard for electrical components with lead-bearing solder joints or terminal coatings. This means the manufacturer is required to disclose the presence of lead upon request; the part itself remains legal to sell and install under current EU regulations.
Integration Note
The 4-pole form factor occupies four standard DIN-rail module widths (each pole roughly 18 mm). The D-curve at 0.3 A is an uncommon low-current rating — verify that the downstream load's inrush characteristic stays within the 10-20x In magnetic trip band to avoid unwanted trips. For panel builders, the spring-loaded terminal clamps accept up to 25 mm² conductor; torque to the manufacturer's specification for the connection type.