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The Bard 8201-105-30 compressor current monitor assembly is an OEM electrical control component that senses compressor amperage and provides a current proving signal used by the unit controls to confirm the compressor is actually running when commanded. In Bard wall-mount heat pump applications such as the CH4S1-A, this current sensing relay board helps prevent nuisance operation and protects the system by allowing the control circuit to respond appropriately to abnormal run conditions. Use this part when troubleshooting compressor proof or current sensing faults, and confirm compatibility by matching the full part number and the unit model and serial information before ordering.