The Siemens 5SL6420-7 is a 4-pole SENTRON miniature circuit breaker with C-curve tripping characteristic rated at 20 A. Breaking capacity is 6 kA dual-rated to both EN 60898 and IEC 60947-2, covering residential and light commercial branch-circuit protection. The 4-module-width (72 mm) body snaps onto standard DIN rail and accepts auxiliary switches or shunt trips via the accessory slot.
What the ratings mean for fit
The C-curve is the standard choice for moderate inrush loads. At 20 A per pole on a 400 V AC three-phase system, this breaker handles general-purpose load. Operating temperature range of -40 °C to 75 °C covers unheated enclosures and rooftop cabinets. Pollution degree 2 and overvoltage category III suit fixed-installation distribution boards. IP20 with connected conductors means the busbar and wiring must be enclosed — this is a panel-mount breaker, not a standalone device.
Panel integration notes
Four modular width units (72 mm wide) on standard DIN rail. Installation depth 70 mm; overall depth 76 mm. Sealable with a lead seal through the toggle slot.