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Bard part number 8408-022 is an OEM high temperature alarm switch used to help protect Bard wall mounted and packaged HVAC equipment by signaling an overtemperature condition at a setpoint of 63 to 107 degrees C with contacts that close on temperature rise. This type of safety switch is commonly tied into alarm or lockout circuits so the unit can alert building controls or shut down before heat related damage occurs, making it a critical reliability part when you are troubleshooting nuisance trips or replacing a failed temperature safety. Match the part number to your unit parts list to confirm the correct application and verify wiring connections during replacement to maintain proper safety operation.