The 4-1393248-0 is a W33 series thermal circuit breaker and power switch that combines on/off switching and circuit protection in a single unit. It features one or two pole sensing with switchable circuit function, available in ratings from 2 to 20 amps, and supports maximum operating voltages of 50VDC or 250VAC to 400 Hz with an interrupt capacity of 1,000 amps at 50VDC/250VAC 60 Hz and 1,500 amps at 125/250VAC 60 Hz. The device includes a rocker actuator available in multiple colors with optional lighted variants, snap-in panel mounting, and resettable overload capacity of ten times the rated current. It is UL 1077 recognized as a supplementary protector and CSA accepted, making it suitable for appliance protection, industrial control panels, and power distribution applications where reliable thermal protection and manual switching are required.