The Macromatic CAH20A2AF is a current sensing relay. This encapsulated relay has an input voltage of 120V AC. It is made to monitor 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 0.15-7 seconds. There is a 4 second sensing time delay on startup. The built-in current transformer offers greater access and sensitivity, as the wire can be looped around multiple times. The encapsulated housing is perfect for harsher conditions. Note: Image is an approximation. Actual part may differ.
Specifications
Using the switch, the user selects whether the relay checks for over or under current errors. The relay starts monitoring for faults once the input voltage is implemented and the startup time delay has passed. If an overcurrent error is found, 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 remains that way until the current falls below the reset level. If an undercurrent situation occurs, the current drops 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 CAH20A2AF has an LED, which glows red to indicate that a fault is found. 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