The 7940102801 is a thermal-magnetic supplementary circuit breaker from the CB4200 series. It features a tease-free design to reduce contact damage and a trip-free mechanism that prevents the breaker from being held closed during a fault condition. This breaker operates with a push-button for trip and reset functions and is designed for mounting on a 35mm DIN-rail. Rated for 250V AC and 65V DC, it is suitable for providing supplementary protection in various industrial applications.