This is a MALE RS232 to TTL signal serial converter cable. The type I cable converts a serial signal to TTL with connections for Tx, Rx, +3V/5V and ground. The TTL connector is a 4-pin Friction Lock with a 0.100" pitch.
These universal circuit breakers feature a snap-off design blade that allows an installer to size the blades to fit standard ATO / ATC fuse panels. The color coded markings match the color coding for ATO / ATC blade fuses.