Lennox 95M57 Contactor

The Lennox 95M57 is a heavy-duty, 3-pole definite purpose contactor engineered for high-demand residential and commercial HVAC applications. This 24V HVAC contactor is rated for 25 Amp inductive loads and features a 3-pole configuration, providing simultaneous switching for multi-phase systems often found in Lennox condenser units and packaged RTUs. For technicians dealing with air conditioner not turning on symptoms, the 95M57 provides a direct OEM replacement to restore power flow to compressors and condenser fan motors. Its 24 VAC 50/60 Hz coil ensures compatibility with standard low-voltage control circuits, while the integrated dust cover protects the silver cadmium oxide contacts against pitting caused by insects or debris. Whether you are performing a Lennox furnace repair or maintaining a 3-phase cooling system, this 100438-03 contactor offers the structural integrity required to handle high locked rotor amps (up to 150A at 240V) without premature failure.

Key Benefits

• OEM Compatibility: Precision-matched for over 1,200 Lennox models, including GCS16, HP26, and HS29 series, ensuring a drop-in fit for fast HVAC unit replacement.
• Enhanced Durability: Equipped with a factory-installed dust cover to prevent contact fouling from spiders and nesting insects, reducing AC repair service call-backs.
• Versatile Application: Rated for up to 600V operation, making it suitable for 240/415V 3-phase and 480/600V technical configurations in industrial motor control panels.
• High Cycle Reliability: Advanced coil technology minimizes power consumption and thermal stress, maintaining consistent switching frequency even in harsh environments.

Common Questions

How do I know if my contactor is bad?
Technicians should check for resistance across the 24V coil. If your meter shows "OL" or an open circuit, the coil has failed. Additionally, look for pitted contacts or a "chattering" sound during a call for cooling, which often indicates the points are no longer making a clean connection.

Can I use a 3-pole contactor in place of a 1rd or 2-pole unit?
While a 3-pole contactor can technically interrupt three separate legs of power, it is specifically designed for 3-phase equipment. Ensure the amperage rating and coil voltage match your system requirements before modifying the original wiring footprint.

What causes a Lennox 95M57 to burn out?
Low control voltage (below 18-20V) can cause the contacts to bounce, leading to excessive arcing and pitting. High ambient temperatures or loose terminal connections are also common causes of Lennox contactor failure in the field.

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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.