Lennox 48G57 Contactor
The Lennox 48G57 Contactor is a heavy-duty, 25-amp definite purpose control component engineered for high-cycle demands in residential and commercial HVACR systems. As a 2-pole 24V contactor, this OEM replacement part handles the primary electrical load for compressors and condenser fans, ensuring synchronized phase switching to protect internal motor windings. The 48G57 features 24VAC 50/60Hz coil operations and 1/4-inch quick-connect terminals, providing a drop-in solution for Lennox units and compatible hardware from Allied, Armstrong, and Ducane. This model includes an integrated auxiliary contact (SPDT) to facilitate additional sequence-of-operation control signals, such as crankcase heater regulation or status monitoring. Built for longevity in harsh environments, this magnetic contactor maintains a low resistance of 35 Ohms to minimize heat generation during continuous full-load amperage (25 FLA) service. This component is essential for technicians replacing pitted or welded contacts to restore system reliability and prevent locked-rotor amperage damage to the compressor.
Key Benefits- Universal Coil Compatibility: The 24VAC coil operates on both 50Hz and 60Hz frequencies, meeting standard HVAC control circuit requirements.
- Integrated Auxiliary Switch: Built-in SPDT auxiliary contact allows for complex wiring configurations without needing external snap-on modules.
- High Load Rating: Rated for up to 25 full load amps, making it suitable for a wide range of Lennox HP14 and HP21 series outdoor units.
- Direct Replacement Logic: Replaces legacy part number 48G5701, ensuring terminal positions match original wiring harnesses for faster field service.
- Silver-Cadmium Oxide Contacts: Resists arcing and pitting under high inductive loads to ensure consistent electrical conductivity.
What does the auxiliary contact do on the Lennox 48G57?
The auxiliary contact acts as a secondary switch that changes state simultaneously with the main poles. In HVAC systems, this is typically used to control a crankcase heater or to send a feedback signal to the control board or thermostat.
Can I use this 2-pole contactor to replace a single-pole model?
While 2-pole contactors break both legs of the power supply for increased safety during service, you must verify the physical footprint and terminal layout. Using the 48G57 ensures you are following the original OEM technical specifications for Lennox equipment.
What causes this contactor to fail prematurely?
Chattering caused by low-voltage control signals or pests (like ants) getting between the contacts are common causes. Routine inspection of the 48G57 for carbon buildup or copper discoloration is recommended during seasonal maintenance.
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: $74.45
-65%$74.45
$26.06Lennox 48G57 Contactor
The Lennox 48G57 Contactor is a heavy-duty, 25-amp definite purpose control component engineered for high-cycle demands in residential and commercial HVACR systems. As a 2-pole 24V contactor, this OEM replacement part handles the primary electrical load for compressors and condenser fans, ensuring synchronized phase switching to protect internal motor windings. The 48G57 features 24VAC 50/60Hz coil operations and 1/4-inch quick-connect terminals, providing a drop-in solution for Lennox units and compatible hardware from Allied, Armstrong, and Ducane. This model includes an integrated auxiliary contact (SPDT) to facilitate additional sequence-of-operation control signals, such as crankcase heater regulation or status monitoring. Built for longevity in harsh environments, this magnetic contactor maintains a low resistance of 35 Ohms to minimize heat generation during continuous full-load amperage (25 FLA) service. This component is essential for technicians replacing pitted or welded contacts to restore system reliability and prevent locked-rotor amperage damage to the compressor.
Key Benefits- Universal Coil Compatibility: The 24VAC coil operates on both 50Hz and 60Hz frequencies, meeting standard HVAC control circuit requirements.
- Integrated Auxiliary Switch: Built-in SPDT auxiliary contact allows for complex wiring configurations without needing external snap-on modules.
- High Load Rating: Rated for up to 25 full load amps, making it suitable for a wide range of Lennox HP14 and HP21 series outdoor units.
- Direct Replacement Logic: Replaces legacy part number 48G5701, ensuring terminal positions match original wiring harnesses for faster field service.
- Silver-Cadmium Oxide Contacts: Resists arcing and pitting under high inductive loads to ensure consistent electrical conductivity.
What does the auxiliary contact do on the Lennox 48G57?
The auxiliary contact acts as a secondary switch that changes state simultaneously with the main poles. In HVAC systems, this is typically used to control a crankcase heater or to send a feedback signal to the control board or thermostat.
Can I use this 2-pole contactor to replace a single-pole model?
While 2-pole contactors break both legs of the power supply for increased safety during service, you must verify the physical footprint and terminal layout. Using the 48G57 ensures you are following the original OEM technical specifications for Lennox equipment.
What causes this contactor to fail prematurely?
Chattering caused by low-voltage control signals or pests (like ants) getting between the contacts are common causes. Routine inspection of the 48G57 for carbon buildup or copper discoloration is recommended during seasonal maintenance.
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 48G57 Contactor is a heavy-duty, 25-amp definite purpose control component engineered for high-cycle demands in residential and commercial HVACR systems. As a 2-pole 24V contactor, this OEM replacement part handles the primary electrical load for compressors and condenser fans, ensuring synchronized phase switching to protect internal motor windings. The 48G57 features 24VAC 50/60Hz coil operations and 1/4-inch quick-connect terminals, providing a drop-in solution for Lennox units and compatible hardware from Allied, Armstrong, and Ducane. This model includes an integrated auxiliary contact (SPDT) to facilitate additional sequence-of-operation control signals, such as crankcase heater regulation or status monitoring. Built for longevity in harsh environments, this magnetic contactor maintains a low resistance of 35 Ohms to minimize heat generation during continuous full-load amperage (25 FLA) service. This component is essential for technicians replacing pitted or welded contacts to restore system reliability and prevent locked-rotor amperage damage to the compressor.
Key Benefits- Universal Coil Compatibility: The 24VAC coil operates on both 50Hz and 60Hz frequencies, meeting standard HVAC control circuit requirements.
- Integrated Auxiliary Switch: Built-in SPDT auxiliary contact allows for complex wiring configurations without needing external snap-on modules.
- High Load Rating: Rated for up to 25 full load amps, making it suitable for a wide range of Lennox HP14 and HP21 series outdoor units.
- Direct Replacement Logic: Replaces legacy part number 48G5701, ensuring terminal positions match original wiring harnesses for faster field service.
- Silver-Cadmium Oxide Contacts: Resists arcing and pitting under high inductive loads to ensure consistent electrical conductivity.
What does the auxiliary contact do on the Lennox 48G57?
The auxiliary contact acts as a secondary switch that changes state simultaneously with the main poles. In HVAC systems, this is typically used to control a crankcase heater or to send a feedback signal to the control board or thermostat.
Can I use this 2-pole contactor to replace a single-pole model?
While 2-pole contactors break both legs of the power supply for increased safety during service, you must verify the physical footprint and terminal layout. Using the 48G57 ensures you are following the original OEM technical specifications for Lennox equipment.
What causes this contactor to fail prematurely?
Chattering caused by low-voltage control signals or pests (like ants) getting between the contacts are common causes. Routine inspection of the 48G57 for carbon buildup or copper discoloration is recommended during seasonal maintenance.
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.
