The Siemens 5SL4520-7CC is a 1+N-pole miniature circuit breaker rated 20 A with a C-trip curve, breaking capacity of 10 kA at 230 V. It's a current-production Basic Devices family part — still rolling off the line, not a phase-out or NRND item. The 1+N configuration switches both line and neutral, which matters when you need full isolation downstream.
Snap-on DIN rail mount, standard 1+N module width. Pairs with the 5SL series busbar and accessory range. Group code P310, product group 3823 if you're cross-referencing Siemens internal catalogs.