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The Model 279 is a single-set-point DC current monitor. The monitor sense from 1 to 10 amps DC, and is available for 24 or 120 VAC, 40 or 60 Hz supply voltages. The standard version, the 279B, has a screwdriver adjustable trip and hysteresis setting on top of the device. The hysteresis setting adjusts from 0% to 100%, and can be set fully clockwise for manual reset operation. A remote adjust version, the 279C, has a remote trip adjustment and a remote reset button. An LED indicator is provided on both versions to indicate when the relay is energized (current above the trip setting.) The 279B plugs into a standard 8-pin octal socket; the 279C plugs into a standard 11-pin socket.