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Bard part number 8201-085 is an OEM 3 phase line monitor (phase monitor) used in the control section of many Bard wall-mounted package units to help protect the compressor and other components by verifying proper three-phase power conditions before operation. If your unit is experiencing nuisance shutdowns, phase loss, or phase reversal concerns, replacing the 8201-085 with the correct Bard OEM monitor can restore reliable power monitoring and help prevent damage caused by incorrect incoming power. As with any three-phase control component, confirm your unit model and wiring diagram for compatibility and verify line voltage and phase sequence during installation to ensure the monitor is protecting the system as intended.