What amp contactor do I need for my Lennox system?

The correct replacement for Lennox model OEM Lennox Contactor 3-Pole 120V 60A — 77X57 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Contactor 3-Pole 120V 60A — 77X57.

My AC clicks but the compressor does not turn on. What is wrong?

Clicking from the outdoor unit without the compressor starting usually means a worn contactor. The contactor is the relay that sends power to the compressor. When its contacts are pitted or worn, it clicks but cannot establish a solid electrical connection. Other symptoms: visible pitting or burn marks on the contactor face, AC works intermittently, or buzzing from the contactor.

Lennox

OEM Lennox Contactor 3-Pole 120V 60A — 77X57

Name: OEM Lennox Contactor 3-Pole 120V 60A — 77X57
Brand: Lennox
SKU: LNX-77X57
Price: 28.95 USD
Availability: InStock

SKU: LNX-77X57 Brand: Lennox

$28.95 $38.95

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The genuine OEM Lennox 77X57 is a three-pole contactor with a 120-volt control coil rated at 60 amps per pole. This heavy-duty switching relay energizes all three legs of high-voltage power to the compressor and outdoor fan in Lennox equipment that uses a line-voltage (120V) control circuit, handling the full load each time the system calls for cooling.

Warning signs of a worn contactor include a persistent buzzing or chattering coil, contacts that weld shut and keep the compressor running continuously, burnt or pitted terminals, and a unit that won't start on demand. With a three-pole design, a single failed pole can cause single-phasing that overheats and damages the compressor motor.

Because the 77X57 carries a 60-amp rating and a 120V coil, matching the OEM specification is essential — the wrong coil voltage won't pull in, and an under-rated contactor will fail early under load. This factory part ensures the exact coil voltage, amperage, and three-pole layout your Lennox system requires for reliable, full-rated performance.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Lennox Contactor 3-Pole 120V...

$28.95

Frequently Asked Questions

Does this Contactor fit my Lennox OEM Lennox Contactor 3-Pole 120V 60A — 77X57?

Yes. This is the factory-specified OEM contactor for the Lennox OEM Lennox Contactor 3-Pole 120V 60A — 77X57. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the contactor on my Lennox OEM Lennox Contactor 3-Pole 120V 60A — 77X57?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Open condensing unit panel. Step 3: Photograph ALL wiring on the contactor. Step 4: Label each wire with tape. Step 5: Disconnect wires and remove old contactor. Step 6: Mount new contactor, reconnect wires matching your photo. Step 7: Restore power and test.

My AC clicks but the compressor won’t turn on. What’s wrong?

Clicking from the outdoor unit without the compressor starting = worn contactor. The contactor sends power to the compressor. When its contacts are pitted, it clicks but can’t make solid contact. Look for: visible pitting/burn marks on the contactor face, intermittent operation, or buzzing.

Is this contactor compatible with Bryant or Payne too?

Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Lennox contactor?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Lennox Contactor 3-Pole 120V 60A — 77X57

Shipping Information

Return Policy

Frequently Asked Questions