Lincoln 369178 Contactor Reference

How This Contactor Works

A contactor uses a low-voltage or line-voltage coil to bridge separate power lines. When the control circuit sends voltage to the coil, it creates a magnetic field.

This magnetic pull closes the internal switch points. Power then flows across the poles to turn on your equipment. When the control signal ends, the switch opens and shuts the system down.

Understanding the 369178 Specifications

Every contactor has fixed electrical ratings that must match the load it controls. The Lincoln 369178 has specific electrical and physical measurements listed on its label.

• Voltage: 120V coil rating
• Current: 35A
• Poles: 3 Pole
• Height: 4.15 in / 10.54 cm
• Length: 5.2 in / 13.21 cm
• Width: 4.2 in / 10.67 cm

Signs of Contactor Failure and Safe Replacement

Contactors endure heat and electrical arcs over time. Common signs of wear include burnt or pitted contacts, a loud buzz during operation, or equipment that fails to start or stop when called.

Replacing the part safely requires careful attention to electrical shutoff procedures.

1. Shut off electrical power completely at the main breaker and the disconnect switch.
2. Use a meter to test for power and confirm no voltage is present.
3. Discharge any nearby capacitor with an insulated tool before touching terminals.
4. Take a clear photo of all connected wires to record their exact positions.
5. Disconnect wires one at a time and secure them to the matching terminals on the new unit.
6. Mount the new contactor securely in place and restore power.

Read your old part

1. Look at the label on your existing part to find the stamped part number.
2. Confirm the part number reads 369178.
3. Check that the coil voltage matches 120V.
4. Count the contact lines to verify it is a 3 Pole configuration.
5. Check that your system's current draw does not exceed the 35A rating.
6. Measure the mounting space to make sure it accommodates 5.2 in / 13.21 cm length, 4.2 in / 10.67 cm width, and 4.15 in / 10.54 cm height.