Berko 5018-0004-103 Contactor

The Berko 5018-0004-103 Contactor is a heavy-duty, industrial-grade electrical control component designed specifically for three-phase commercial heating applications. This 3-pole definite purpose contactor features a 277V AC coil and is rated for 35 amp loads, making it a critical replacement part for QMark and Berko unit heaters. Built for high-cycle reliability in demanding HVACR environments, this contactor ensures efficient power distribution to heating elements while maintaining consistent circuit integrity. As a genuine Marley Engineered Products OEM part, it offers a direct-fit solution for technicians servicing 277V three-phase heating systems, eliminating the compatibility guesswork associated with universal alternatives. Whether you are performing a routine preventive maintenance check or responding to a terminal failure, this contactor provides the robust switching capacity required for long-term operational stability in commercial and industrial air handling units.

• OEM Precision: Direct replacement for Marley 5018-0004-103, ensuring exact physical and electrical alignment with factory specifications.
• High Amperage Rating: Rated for 35A to provide reliable switching for high-wattage three-phase electric heaters.
• Industrial Durability: Engineered for high-frequency cycling and harsh electrical environments commonly found in HVACR applications.
• Optimized Coil Performance: Features a dedicated 277V coil for stable pull-in and hold-in voltages in commercial power grids.
• Multi-Model Compatibility: Verified for use in several Marley unit heater series including UH, 547, and 557 models.

Is the Berko 5018-0004-103 compatible with 24V control circuits?
No, this specific model is equipped with a 277V AC coil. If your control circuit is 24V, you must use the 5018-0004-100 variant to avoid coil burnout or failure to engage.

Can I use this 3-pole contactor in a single-phase application?
While a 3-pole contactor can technically switch a single-phase load by using two of the three poles, this unit is specifically optimized for three-phase power distribution in Berko and QMark heating systems.

What are the primary indicators that this contactor needs replacement?
Signs of failure include pitted or welded contacts, audible humming from the 277V coil, or a complete lack of continuity across the poles when the coil is energized.

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.