The 1020059 is a UL 1077 supplementary protector from the Phoenix Contact TMC 7 series, providing robust overcurrent protection for various devices. It features a snap-action mechanism that reduces internal contact wear for increased longevity and a trip-free design that enhances safety by preventing the circuit from being closed during an overcurrent event. This dual-rated (AC/DC) circuit breaker increases system reliability by isolating problematic circuits, allowing the rest of the system to remain operational. It is ideal for applications such as motor control circuits, lighting controls, control power transformers, and protecting sensitive equipment like PLC I/Os and relays.