The First Company E146 is an OEM replacement L145-40F limit switch engineered to provide reliable high-temperature protection in First Company air handlers and fan coil systems. When supply-air temperatures exceed safe operating thresholds, the limit switch interrupts the circuit to prevent equipment damage and protect occupants — then automatically resets once temperatures return to a safe level.
How It Works
The L145-40F designation defines the switch’s operating parameters: the contacts open (trip) when the sensed temperature reaches 145°F and close (reset) after the temperature drops by 40°F, returning the system to normal operation at approximately 105°F. This automatic-reset action makes the switch ideal for continuous-duty residential and light-commercial HVAC applications.
Key Features
- OEM First Company replacement part — direct drop-in fit for compatible air handler models
- Opens at 145°F to interrupt the circuit on high-temperature condition
- 40°F differential — automatically resets at approximately 105°F
- Automatic-reset operation for continuous-duty HVAC systems
- Compact design for easy installation in tight equipment cabinets
- Provides overheat protection to safeguard heat exchangers, blower motors, and downstream components
Specifications
- SKU: E146
- Part Number: L145-40F
- Brand: First Company
- Trip Temperature: 145°F
- Differential: 40°F
- Reset Temperature: ~105°F
- Reset Type: Automatic
- Application: Air handlers, fan coil units
Application
Designed as a direct OEM replacement for First Company air handler units, this limit switch is a critical safety component that should be replaced promptly if the original is found to be faulty. Always verify compatibility with your specific unit model before installation.
