MARS 39042 Limit Switch
The MARS 39042 is a professional-grade Manual Reset Limit Switch designed for high-temperature safety across commercial and residential HVACR systems. This SPST (Single Pole Single Throw) switch is engineered to open on temperature rise at a fixed 240F cut-out temperature, providing a critical secondary safety layer for furnace plenums and air handling units. Operating within a 120/240V rating and supporting 5 to 10 Amps, it replaces standard 3/4-inch snap disc thermostats and competitive models like the L240 limit switch or Klixon MR240. The integral oval flange ensures seamless mounting into existing furnace housing, while the manual reset button requires physical intervention, alerting technicians to potential overheating issues before system restart.
Key Benefits for Technicians:
- Broad Compatibility: Serves as a universal HVAC high-limit replacement for a wide range of OEM furnace and air handler brands.
- Precision Safety: Fixed 240-degree temperature limit prevents heat exchanger damage and ensures code compliance.
- Durable Construction: Features snap-action contacts for reliable electrical breaks and industrial-grade housing for high-ambient environments.
- Easy Retrofitting: Standard 3/4" configuration with universal mounting holes reduces truck stock requirements.
Common Industry Questions:
What causes a MARS 39042 to trip?
Usually, a 240F trip indicates restricted airflow, often due to a clogged filter, failing blower motor, or cracked heat exchanger. Because this is a manual reset limit switch, the technician must investigate the root cause before pressing the reset button.
Can I use this for both 120V and 240V circuits?
Yes, its electrical rating of 120/240 V and 5-10 A allows it to function in both standard residential furnace circuits and heavier commercial heating applications.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
MARS 39042 Limit Switch
The MARS 39042 is a professional-grade Manual Reset Limit Switch designed for high-temperature safety across commercial and residential HVACR systems. This SPST (Single Pole Single Throw) switch is engineered to open on temperature rise at a fixed 240F cut-out temperature, providing a critical secondary safety layer for furnace plenums and air handling units. Operating within a 120/240V rating and supporting 5 to 10 Amps, it replaces standard 3/4-inch snap disc thermostats and competitive models like the L240 limit switch or Klixon MR240. The integral oval flange ensures seamless mounting into existing furnace housing, while the manual reset button requires physical intervention, alerting technicians to potential overheating issues before system restart.
Key Benefits for Technicians:
- Broad Compatibility: Serves as a universal HVAC high-limit replacement for a wide range of OEM furnace and air handler brands.
- Precision Safety: Fixed 240-degree temperature limit prevents heat exchanger damage and ensures code compliance.
- Durable Construction: Features snap-action contacts for reliable electrical breaks and industrial-grade housing for high-ambient environments.
- Easy Retrofitting: Standard 3/4" configuration with universal mounting holes reduces truck stock requirements.
Common Industry Questions:
What causes a MARS 39042 to trip?
Usually, a 240F trip indicates restricted airflow, often due to a clogged filter, failing blower motor, or cracked heat exchanger. Because this is a manual reset limit switch, the technician must investigate the root cause before pressing the reset button.
Can I use this for both 120V and 240V circuits?
Yes, its electrical rating of 120/240 V and 5-10 A allows it to function in both standard residential furnace circuits and heavier commercial heating applications.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The MARS 39042 is a professional-grade Manual Reset Limit Switch designed for high-temperature safety across commercial and residential HVACR systems. This SPST (Single Pole Single Throw) switch is engineered to open on temperature rise at a fixed 240F cut-out temperature, providing a critical secondary safety layer for furnace plenums and air handling units. Operating within a 120/240V rating and supporting 5 to 10 Amps, it replaces standard 3/4-inch snap disc thermostats and competitive models like the L240 limit switch or Klixon MR240. The integral oval flange ensures seamless mounting into existing furnace housing, while the manual reset button requires physical intervention, alerting technicians to potential overheating issues before system restart.
Key Benefits for Technicians:
- Broad Compatibility: Serves as a universal HVAC high-limit replacement for a wide range of OEM furnace and air handler brands.
- Precision Safety: Fixed 240-degree temperature limit prevents heat exchanger damage and ensures code compliance.
- Durable Construction: Features snap-action contacts for reliable electrical breaks and industrial-grade housing for high-ambient environments.
- Easy Retrofitting: Standard 3/4" configuration with universal mounting holes reduces truck stock requirements.
Common Industry Questions:
What causes a MARS 39042 to trip?
Usually, a 240F trip indicates restricted airflow, often due to a clogged filter, failing blower motor, or cracked heat exchanger. Because this is a manual reset limit switch, the technician must investigate the root cause before pressing the reset button.
Can I use this for both 120V and 240V circuits?
Yes, its electrical rating of 120/240 V and 5-10 A allows it to function in both standard residential furnace circuits and heavier commercial heating applications.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
