Bard 8406-099 - Differential Pressure Switch

Bard part number 8406-099 is an OEM differential pressure switch set to open on a falling pressure condition at approximately 0.63 in. w.c., helping the unit verify proper airflow and safe operating conditions before allowing normal operation. On Bard wall-mounted equipment, this type of switch is commonly used in airflow proving applications and will open its contacts if the required pressure signal drops, which can prevent nuisance operation and protect critical components. If you are chasing intermittent safeties or airflow-related lockouts, replacing a weak or drifting pressure switch with the correct Bard OEM part is a reliable fix, but always match the setpoint and verify the tubing and ports are clear so the new switch can sense pressure accurately.

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(844) WALLMOUNT (844-925-5668)