Markel Products Co. 57640004 Limit
The Markel Products Co. 57640004 is a critical safety component designed for professional-grade thermal management. This L300F Auto Reset Limit Switch is engineered to open the circuit at a fixed temperature of 300°F (149°C), providing essential over-temperature protection for heating elements and internal components. As an auto-reset limit, the device automatically restores electrical continuity once temperatures drop back to a safe operating range, reducing system downtime compared to manual reset alternatives. This specific Markel 57640004 limit switch features a capillary-style sensor and is a direct OEM replacement for Fostoria, Markel, and TPI heating systems. Whether you are servicing industrial unit heaters or commercial electric baseboards, this HVAC high limit control ensures the equipment stays within design parameters while protecting against blower failure or restricted airflow conditions. Built for durability in high-cycle applications, its precision calibration minimizes nuisance tripping while maintaining a strict safety ceiling.
Technical Benefits for Contractors:
- Universal Compatibility: Engineered as a drop-in replacement for TPI, Fostoria, and Markel Products industrial heating units.
- Automatic Recovery: Features the L300F auto reset mechanism, eliminating the need for manual intervention after a temporary thermal excursion.
- Precise Thermal Cutout: Calibrated to trip at 300 degrees Fahrenheit to prevent damage to heat exchangers and furnace housings.
- Rugged Construction: Designed with a high-grade capillary sensor housing to withstand the vibration and thermal cycling common in commercial HVACR environments.
- Safety Compliance: Acts as a primary overheat protection switch, ensuring systems meet local fire and safety codes for automated heating equipment.
Common Technical Questions:
What does the L300F designation signify for this limit switch?
The "L" indicates a limit control that opens on temperature rise, "300" refers to the trip setpoint of 300°F, and "F" signifies it is a fixed-temperature, auto-resetting model.
Can this switch be used in 24V or 120V control circuits?
Yes, this Markel 57640004 is typically rated for standard pilot duty applications across common control voltages used in HVACR systems, though you should always verify the amperage draw of your specific contactor coil.
How do I test the functionality of an auto-reset limit?
Using a multimeter, you should find continuity (0 ohms) across the terminals at room temperature. If the circuit is open while the unit is cool, the internal bimetal or capillary mechanism has failed and the replacement limit switch must be installed.
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.
Markel Products Co. 57640004 Limit
The Markel Products Co. 57640004 is a critical safety component designed for professional-grade thermal management. This L300F Auto Reset Limit Switch is engineered to open the circuit at a fixed temperature of 300°F (149°C), providing essential over-temperature protection for heating elements and internal components. As an auto-reset limit, the device automatically restores electrical continuity once temperatures drop back to a safe operating range, reducing system downtime compared to manual reset alternatives. This specific Markel 57640004 limit switch features a capillary-style sensor and is a direct OEM replacement for Fostoria, Markel, and TPI heating systems. Whether you are servicing industrial unit heaters or commercial electric baseboards, this HVAC high limit control ensures the equipment stays within design parameters while protecting against blower failure or restricted airflow conditions. Built for durability in high-cycle applications, its precision calibration minimizes nuisance tripping while maintaining a strict safety ceiling.
Technical Benefits for Contractors:
- Universal Compatibility: Engineered as a drop-in replacement for TPI, Fostoria, and Markel Products industrial heating units.
- Automatic Recovery: Features the L300F auto reset mechanism, eliminating the need for manual intervention after a temporary thermal excursion.
- Precise Thermal Cutout: Calibrated to trip at 300 degrees Fahrenheit to prevent damage to heat exchangers and furnace housings.
- Rugged Construction: Designed with a high-grade capillary sensor housing to withstand the vibration and thermal cycling common in commercial HVACR environments.
- Safety Compliance: Acts as a primary overheat protection switch, ensuring systems meet local fire and safety codes for automated heating equipment.
Common Technical Questions:
What does the L300F designation signify for this limit switch?
The "L" indicates a limit control that opens on temperature rise, "300" refers to the trip setpoint of 300°F, and "F" signifies it is a fixed-temperature, auto-resetting model.
Can this switch be used in 24V or 120V control circuits?
Yes, this Markel 57640004 is typically rated for standard pilot duty applications across common control voltages used in HVACR systems, though you should always verify the amperage draw of your specific contactor coil.
How do I test the functionality of an auto-reset limit?
Using a multimeter, you should find continuity (0 ohms) across the terminals at room temperature. If the circuit is open while the unit is cool, the internal bimetal or capillary mechanism has failed and the replacement limit switch must be installed.
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
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Description
The Markel Products Co. 57640004 is a critical safety component designed for professional-grade thermal management. This L300F Auto Reset Limit Switch is engineered to open the circuit at a fixed temperature of 300°F (149°C), providing essential over-temperature protection for heating elements and internal components. As an auto-reset limit, the device automatically restores electrical continuity once temperatures drop back to a safe operating range, reducing system downtime compared to manual reset alternatives. This specific Markel 57640004 limit switch features a capillary-style sensor and is a direct OEM replacement for Fostoria, Markel, and TPI heating systems. Whether you are servicing industrial unit heaters or commercial electric baseboards, this HVAC high limit control ensures the equipment stays within design parameters while protecting against blower failure or restricted airflow conditions. Built for durability in high-cycle applications, its precision calibration minimizes nuisance tripping while maintaining a strict safety ceiling.
Technical Benefits for Contractors:
- Universal Compatibility: Engineered as a drop-in replacement for TPI, Fostoria, and Markel Products industrial heating units.
- Automatic Recovery: Features the L300F auto reset mechanism, eliminating the need for manual intervention after a temporary thermal excursion.
- Precise Thermal Cutout: Calibrated to trip at 300 degrees Fahrenheit to prevent damage to heat exchangers and furnace housings.
- Rugged Construction: Designed with a high-grade capillary sensor housing to withstand the vibration and thermal cycling common in commercial HVACR environments.
- Safety Compliance: Acts as a primary overheat protection switch, ensuring systems meet local fire and safety codes for automated heating equipment.
Common Technical Questions:
What does the L300F designation signify for this limit switch?
The "L" indicates a limit control that opens on temperature rise, "300" refers to the trip setpoint of 300°F, and "F" signifies it is a fixed-temperature, auto-resetting model.
Can this switch be used in 24V or 120V control circuits?
Yes, this Markel 57640004 is typically rated for standard pilot duty applications across common control voltages used in HVACR systems, though you should always verify the amperage draw of your specific contactor coil.
How do I test the functionality of an auto-reset limit?
Using a multimeter, you should find continuity (0 ohms) across the terminals at room temperature. If the circuit is open while the unit is cool, the internal bimetal or capillary mechanism has failed and the replacement limit switch must be installed.
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.
