Lennox 72L12 Contactor
The Lennox 72L12 is a professional-grade 2-pole definite purpose contactor engineered for heavy-duty HVACR applications. Operating with a 24V coil, this contactor is rated for 40 amps and is specifically designed to manage the high inductive loads associated with compressors and fan motors in residential and commercial condensing units. As a direct replacement for the 3100-20Q18999C, the 72L12 ensures seamless HVAC part compatibility and structural integrity in Lennox systems. This electrical component features reinforced silver cadmium oxide contacts to provide high conductivity and resist arcing, handling locked rotor amps (LRA) up to 240A during initial startup. For technicians performing AC contactor replacement, the 72L12 offers a standard mounting bracket and quick-connect terminals for efficient field installation. Its robust 2-pole DPST (Double Pole Single Throw) configuration allows for the simultaneous switching of both power legs, ensuring consistent HVAC system performance and motor protection in demanding environments.
Key Benefits- OEM Compatibility: Exact replacement for Lennox 72L12 and cross-referenced with part number 3100-20Q18999C.
- High Ampacity: Rated at 40A Full Load Amps (FLA), ideal for high-tonnage AC units and heat pumps.
- Industrial Durability: Engineered to withstand 240 LRA spikes, reducing contact pitting and premature failure.
- Versatile Application: Standardized 2-pole design compatible with 24V control circuits used across various HVACR brands.
- Reliable Switching: Heavy-duty solenoid coil ensures positive engagement to prevent voltage drops or chattering.
What are the symptoms of a failing Lennox 72L12 contactor?
Technicians often encounter chattering sounds, visible pitting on the points, or a burnt coil. If the outdoor fan or compressor won't engage despite receiving a 24V signal from the thermostat control circuit, the contactor is likely fused or open.
Can I use the 72L12 to replace a 30-amp contactor?
Yes, upgrading from a 30A to a 40A contactor like the 72L12 is a common industry practice to increase reliability and service life, provided the voltage and pole count match.
Does this unit include a dust cover for the contacts?
The 72L12 is designed with an enclosed body to minimize debris accumulation, though many technicians prefer to inspect the contact points during annual HVAC maintenance to ensure zero carbon buildup.
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.
Original: $150.17
-65%$150.17
$52.56Lennox 72L12 Contactor
The Lennox 72L12 is a professional-grade 2-pole definite purpose contactor engineered for heavy-duty HVACR applications. Operating with a 24V coil, this contactor is rated for 40 amps and is specifically designed to manage the high inductive loads associated with compressors and fan motors in residential and commercial condensing units. As a direct replacement for the 3100-20Q18999C, the 72L12 ensures seamless HVAC part compatibility and structural integrity in Lennox systems. This electrical component features reinforced silver cadmium oxide contacts to provide high conductivity and resist arcing, handling locked rotor amps (LRA) up to 240A during initial startup. For technicians performing AC contactor replacement, the 72L12 offers a standard mounting bracket and quick-connect terminals for efficient field installation. Its robust 2-pole DPST (Double Pole Single Throw) configuration allows for the simultaneous switching of both power legs, ensuring consistent HVAC system performance and motor protection in demanding environments.
Key Benefits- OEM Compatibility: Exact replacement for Lennox 72L12 and cross-referenced with part number 3100-20Q18999C.
- High Ampacity: Rated at 40A Full Load Amps (FLA), ideal for high-tonnage AC units and heat pumps.
- Industrial Durability: Engineered to withstand 240 LRA spikes, reducing contact pitting and premature failure.
- Versatile Application: Standardized 2-pole design compatible with 24V control circuits used across various HVACR brands.
- Reliable Switching: Heavy-duty solenoid coil ensures positive engagement to prevent voltage drops or chattering.
What are the symptoms of a failing Lennox 72L12 contactor?
Technicians often encounter chattering sounds, visible pitting on the points, or a burnt coil. If the outdoor fan or compressor won't engage despite receiving a 24V signal from the thermostat control circuit, the contactor is likely fused or open.
Can I use the 72L12 to replace a 30-amp contactor?
Yes, upgrading from a 30A to a 40A contactor like the 72L12 is a common industry practice to increase reliability and service life, provided the voltage and pole count match.
Does this unit include a dust cover for the contacts?
The 72L12 is designed with an enclosed body to minimize debris accumulation, though many technicians prefer to inspect the contact points during annual HVAC maintenance to ensure zero carbon buildup.
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.
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Description
The Lennox 72L12 is a professional-grade 2-pole definite purpose contactor engineered for heavy-duty HVACR applications. Operating with a 24V coil, this contactor is rated for 40 amps and is specifically designed to manage the high inductive loads associated with compressors and fan motors in residential and commercial condensing units. As a direct replacement for the 3100-20Q18999C, the 72L12 ensures seamless HVAC part compatibility and structural integrity in Lennox systems. This electrical component features reinforced silver cadmium oxide contacts to provide high conductivity and resist arcing, handling locked rotor amps (LRA) up to 240A during initial startup. For technicians performing AC contactor replacement, the 72L12 offers a standard mounting bracket and quick-connect terminals for efficient field installation. Its robust 2-pole DPST (Double Pole Single Throw) configuration allows for the simultaneous switching of both power legs, ensuring consistent HVAC system performance and motor protection in demanding environments.
Key Benefits- OEM Compatibility: Exact replacement for Lennox 72L12 and cross-referenced with part number 3100-20Q18999C.
- High Ampacity: Rated at 40A Full Load Amps (FLA), ideal for high-tonnage AC units and heat pumps.
- Industrial Durability: Engineered to withstand 240 LRA spikes, reducing contact pitting and premature failure.
- Versatile Application: Standardized 2-pole design compatible with 24V control circuits used across various HVACR brands.
- Reliable Switching: Heavy-duty solenoid coil ensures positive engagement to prevent voltage drops or chattering.
What are the symptoms of a failing Lennox 72L12 contactor?
Technicians often encounter chattering sounds, visible pitting on the points, or a burnt coil. If the outdoor fan or compressor won't engage despite receiving a 24V signal from the thermostat control circuit, the contactor is likely fused or open.
Can I use the 72L12 to replace a 30-amp contactor?
Yes, upgrading from a 30A to a 40A contactor like the 72L12 is a common industry practice to increase reliability and service life, provided the voltage and pole count match.
Does this unit include a dust cover for the contacts?
The 72L12 is designed with an enclosed body to minimize debris accumulation, though many technicians prefer to inspect the contact points during annual HVAC maintenance to ensure zero carbon buildup.
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.
