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The Bard 8402-075 limit control is a 2 pole automatic temperature safety switch used to help protect Bard HVAC equipment from unsafe operating temperatures by opening its contacts when the setpoint is reached and automatically resetting after the unit cools. Listed as an L170-7.0 style limit control with four terminal connections, this OEM control is commonly applied in the unit safety circuit where dependable temperature limiting is required for normal operation and equipment protection. Verify the exact replacement by matching the part number and confirming the temperature range and wiring layout against your Bard unit model and service literature before installation.