The Siemens 5SL3620-7 is a SENTRON 5SL miniature circuit breaker (MCB) in a 4-pole (3P+N) configuration, rated 20 A with a C tripping curve and 4.5 kA breaking capacity per EN 60898 and IEC 60947-2. It's designed for residential and infrastructure final-distribution panels where you need neutral conductor switching and a 400 V AC supply. At 20 A, it handles a typical 4.5 kW resistive load on 230 V single-phase or a 13.8 kW three-phase load at 400 V.
Key ratings with the so-what
Breaking capacity of 4.5 kA at 400 V AC per both EN 60898 and IEC 60947-2 — this is the standard domestic/infrastructure level. If your service entrance has a prospective short-circuit current above 4.5 kA, you need a higher-rated breaker upstream or a current-limiting device. The energy limiting class of 3 means it restricts let-through energy during a fault, which helps with downstream component protection. Rated voltage is 400 V AC for single-phase, with a maximum of 440 V AC in multi-phase operation. The DC maximum rating is 72 V — if you're switching DC loads, keep it below that. Not a cycling device for motor starting; use a contactor for that.
Width is 72 mm (4 width units of 18 mm each), depth 76 mm, height 90 mm. Installation depth is 70 mm. The sealable feature (yes) lets you lock the toggle in position to prevent unauthorized switching — useful for safety-critical circuits or rental-metered sub-distribution.
For a BOM line or a line-down replacement, the fit is confirmed: 4-pole C-curve 20 A at 4.5 kA.