Lochinvar & A.O. Smith 100110093 Contactor

Maintain the integrity of your high-amperage commercial heating systems with the Lochinvar & A.O. Smith 100110093 Contactor. This heavy-duty 3-pole contactor is engineered for high-demand applications, featuring a 120V coil and a 50-amp resistive rating (40 FLA). Designed as a genuine OEM replacement for part numbers including 9004816105, it ensures precise electrical switching for commercial water heaters and boilers from brands like Lochinvar, A.O. Smith, State, and American.

As a veteran technician knows, pitted contacts and burnt coils are primary failure points in HVACR electrical controls. This 50A 120V contactor provides the robust terminal connections and reliable pull-in voltage required to handle the inrush current of large heating elements without premature welding or arcing. Whether you are performing a routine contactor replacement or troubleshooting a system that won't engage, this OEM component ensures original factory specifications for fit and performance are met, reducing callbacks and protecting the system's internal wiring from high-resistance heat damage.

• Heavy-Duty Rating: 50 Amp resistive and 40 FLA capacity designed for high-kilowatt commercial heating elements.
• Direct OEM Compatibility: Replaces obsolete part 9004816105, fitting a wide range of Lochinvar and A.O. Smith equipment.
• Tri-Pole Design: 3-pole configuration allows for simultaneous switching of three-phase power or multiple heating stages.
• Reliable 120V Actuation: Standard coil voltage ensures seamless integration with existing control circuits and internal transformers.

How do I verify if my existing 100110093 contactor is failing?
Technicians should check for excessive pitting on the contact faces, "chattering" during engagement, or a burnt smell originating from the 120V coil. Use a multimeter to verify 120V at the coil terminals and check for continuity across the poles when the plunger is engaged.

Can I use this 50-amp contactor to replace a 40-amp model?
While a higher amperage rating is generally acceptable for the load, always ensure the coil voltage (120V) and the physical footprint match your specific cabinet requirements. Using a genuine OEM part ensures the terminal locations align with the original wiring harness.

What causes the coil in this contactor to burn out?
Common culprits include low control voltage (undervoltage), which causes the coil to struggle to pull the contacts closed, or debris such as insects getting stuck in the armature, preventing a clean seal and leading to overheating.

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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.