The Carrier HH12ZB200 Limit Switch is a critical OEM replacement part engineered for precise thermal protection in residential and light commercial furnaces

supporting both wall and duct mount configurations

with a maximum working pressure of 667 psig

the Trane 170f CO Auto Limit Switch offers the exact specifications required for a drop-in furnace limit switch replacement

As an auto-reset furnace limit switch

Carrier HH12ZB230 Limit Switch The Carrier HH12ZB200 Limit SwitchThe Carrier HH12ZB230 Limit Switch is a critical safety component designed for precise thermal monitoring in high output furnace and air handler applications. As an OEM Carrier furnace limit switch, this device features an automatic reset mechanism and is calibrated for an opening temperature range of 190F to 230F. This part is engineered to interrupt the burner or heating element circuit if the internal plenum temperature exceeds safe operating