Carrier HH680354 Limit Switch, 250°F Open, 20°F Close Differential

Description

Carrier HH680354 Limit Switch Overview

The Carrier HH680354 is an OEM replacement limit switch engineered to protect furnaces and heating systems from dangerous overheating conditions. Designed as a direct-fit replacement for compatible Carrier equipment, this limit switch delivers dependable, repeatable performance to keep your system operating safely and efficiently.

How It Works

This limit switch is factory-set to open at 250°F, interrupting the burner circuit whenever supply air temperatures reach an unsafe threshold. With a 20°F close differential, the switch automatically resets once temperatures drop back to a safe operating range — minimizing nuisance lockouts while maintaining robust overheat protection.

Key Features

• Opens at 250°F to shut down burner operation during overtemperature conditions
• 20°F close differential for automatic reset when safe temperatures are restored
• OEM Carrier replacement part — ensures proper fit and function in compatible units
• Helps prevent heat exchanger damage, component failure, and potential fire hazards
• Reliable bimetal or disc-type sensing element for consistent, long-term performance
• Direct drop-in replacement minimizes installation time and labor

Application

The HH680354 limit switch is designed for use in Carrier furnaces and air handlers requiring overheat protection at the 250°F setpoint. Always verify compatibility with your specific equipment model before installation.

Why Choose an OEM Limit Switch?

Using a genuine Carrier OEM limit switch ensures the correct trip point, differential, and mounting configuration for your equipment — reducing callbacks, warranty concerns, and the risk of improper operation that can arise from aftermarket substitutes.