SENTRON 5SJ4320-8HG42 – 3-pole 20 A miniature breaker, active production
Rated for use in mechanical engineering and industry, it handles ambient temperatures from -40 °C up to 75 °C, with the 20 A rating holding steady through 40 °C before a gentle derating curve kicks in.
What the ratings mean in the panel
Ingress protection is IP20 when conductors are connected, IP40 in the handle area — enough to keep dust and fingers out in most machine-side enclosures, but not rated for washdown. Vibration tested to 50 m/s² at 25 to 150 Hz — solid enough for mounting on a conveyor drive or pump skid that sees regular thumping. Halogen-free and silicon-free construction matters if this breaker lives in a clean room, electronics assembly, or any area where outgassing from a fault could contaminate product.
How it stacks against the 5SJ4360-7HG41
Both are 3-pole SENTRON breakers in the same 54 mm (3-module) footprint, same mounting and environmental specs.