The Siemens 5SL6220-8CC is a 2-pole miniature circuit breaker (MCB) with a D tripping characteristic, rated at 400 V and 20 A with a 6 kA breaking capacity. The D-curve means it tolerates high inrush currents — typically used for motor, transformer, or lighting loads where the start-up surge would nuisance-trip a B or C curve. It snaps onto a standard DIN rail in a distribution board or sub-panel.
What the ratings mean for fit
The 6 kA breaking capacity at 400 V is the maximum fault current the breaker can safely interrupt. For most commercial and light industrial distribution boards fed from a transformer of typical impedance, 6 kA is sufficient — but verify the prospective short-circuit current (PSCC) at the installation point. The D-curve (10-20× In magnetic trip) is the key selection parameter: use it where loads have a high starting surge, such as small motors, welding equipment, or discharge lighting. A C-curve would trip on the same inrush.
Compliance and documentation
RoHS compliance effective June 2013 covers the current production batch. REACH Article 33 data is available on request for the candidate substance list. Export control is AL: N / ECCN: N, meaning no special licensing for cross-border shipment to most destinations. Group Code P310 and Product Group 3821 are Siemens internal classification codes used for BOM system matching.