The Siemens SENTRON 5SY4620-5 is a 4-pole (3P+N) miniature circuit breaker rated 20 A at 35 °C with a tripping characteristic A. It breaks fault currents up to 10 kA per EN 60898 and 20 kA per IEC 60947-2, with a DC rating of 15 kA per IEC 60947-2. The 4-module-wide body (72 mm) snaps onto a DIN rail and accepts supply from any position.
What the ratings mean for fit
Tripping characteristic A means the breaker trips at 2–3× rated current — faster than B or C curves. This suits circuits with sensitive electronics or long cable runs where a quick trip protects semiconductor loads. The 20 A rating at 35 °C derates to 16.96 A at 60 °C, so a panel running warm needs a higher-rated breaker or forced cooling. The 10 kA breaking capacity under EN 60898 covers standard domestic/commercial fault levels; the 20 kA rating under IEC 60947-2 qualifies it for industrial panels with higher prospective short-circuit current. Pollution degree 3 and overvoltage category III mean it's rated for fixed installations in enclosures where conductive contamination is possible. The 4-pole (3P+N) configuration protects three phases and switches the neutral, common in TT or TN-S systems where neutral isolation is required. Combined terminals top and bottom accept both busbar and cable — no need to choose one connection method.
Deployment context
Snaps onto a DIN rail in a standard 4-module width (72 mm). The quick assembly system means it clips in without tools and can be ganged with other SENTRON units. Installation depth is 70 mm, so it fits shallow enclosures. Mounting position is any — vertical, horizontal, or upside-down — which simplifies panel layout.