The Macromatic CAH20A1BG is a current sensing relay. This encapsulated relay has an input voltage of 240V AC. It is made to check for over or undercurrent faults and has an output of 10A SPDT. It monitors AC current, with an adjustable range of 2-20A and a trip time delay of 0.5-50 seconds. There is a 4 second sensing time delay on startup. The built-in current transformer provides greater access and sensitivity, as the wire can be looped around more than once. The encapsulated housing is intended for harsh environments. Note: Image is an approximation. Actual part may differ.
Specifications
With the selector switch, the user chooses whether the relay checks for over or under current errors. The relay starts monitoring for faults once the input voltage is introduced and the startup time delay has passed. When an overcurrent error occurs, the AC current goes over the set Fault Trip Current for longer than the adjusted time delay. The relay energizes after the time delay and stays energized until the current goes under the reset level. In the event of an undercurrent fault, the current needs to go below the set Fault Trip Current for longer than the time delay. Again, the relay energizes after the time delay and will de-energize once the current goes over the reset level. The CAH20A1BG has an LED which is red when a fault is detected. Has pilot duty rating. Common applications include process control, monitoring for locked rotor or load loss, or open heater or lamp.
Macromatic CAH Series Relay Installation Manual