The Omron S8M-CP04-R is a power multicircuit protector from the S8M series, designed to guard a 24 VDC control circuit against four fault types: overcurrent, overtemperature, overvoltage, and undervoltage. Its trip range spans 0.5 mA to 4 A, with a voltage window of 18.0 to 28.8 VDC — meaning it monitors both the current draw and the supply rail, dropping the load if either strays outside those bounds. That 0.5 mA floor is low enough to catch a failing sensor or a shorted input on a PLC card, while the 4 A ceiling covers a small bank of solenoid valves or a 24 VDC motor-roller zone.
Rated for -10°C to 60°C ambient, so it lives comfortably inside a non-conditioned electrical enclosure alongside drives and contactors.