Looking for extra protection for sensitive equipment in your control panel? This Siemens supplementary protector is a 1-pole breaker rated for 3 amps max, with a tripping characteristic of D (so it handles inrush currents well). It’s UL 1077 listed, meaning it’s designed to work alongside your main circuit breakers to protect things like control circuits, transformers, or power supplies. It mounts on a standard DIN rail and trips faster than a typical UL 489 breaker, which helps isolate faults without shutting down everything else. The thermal trip range is 1.13 to 1.45 times the rating, and it’s got both thermal and magnetic trip mechanisms. Great for industrial applications, machine controls, or any setup where you need selective protection. Keep your gear safe and your downtime low.
