The Siemens 5SL6320-6CC is a 3-pole miniature circuit breaker (MCB) in the Basic Devices family, rated 20 A with a B tripping curve and a 6 kA breaking capacity at 400 V.
Lifecycle status is current and active, so this is a standard-production part available through normal Siemens distribution channels. RoHS compliance dates from June 2013, and REACH candidate-list information is published — the usual regulatory documentation for EU-market panel builds is in place.
Product class is B, meaning return-restricted — contact your Siemens partner or distributor for return authorisation. This is a standard restriction for Siemens circuit protection devices, not a sign of special or non-catalogue status.