KMC Controls MEP-4003 Actuator

The KMC Controls MEP-4003 is a non-spring return direct-coupled actuator engineered for reliable tri-state or floating point control of small dampers and valves in commercial HVAC systems. This 24VAC unit delivers a minimum 40 in-lb torque, making it a standard choice for VAV terminal unit applications and zone control where precision is required without the need for a fail-safe position. Unlike most models in the MEP-4000 series, the MEP-4003 features an open-frame terminal design without an enclosed wiring compartment, facilitating rapid field connections via 14 to 22 AWG wire clamps.

Designed for versatile installation, the MEP-4003 actuator mounts directly to round shafts from 1/4" to 5/8" or square shafts from 1/4" to 7/16" using a heavy-duty V-bolt and the included HMO-4002 non-rotation bracket. The motor timing is rated at 90 seconds for 90 degrees of rotation at 60 Hz, providing smooth modulation that prevents system pressure spikes. For technical troubleshooting, the unit includes a gear disengagement button for manual override and an adjustable mechanical end stop to limit stroke during commissioning.

• Direct-Coupled Versatility: Fits standard damper and valve shafts without the need for additional linkages.
• Compact Form Factor: Small footprint allows for installation in tight plenum spaces and VAV boxes.
• Efficient Power Consumption: Draws only 2 VA of power, reducing the load on 24V control transformers.
• Durable Engineering: Features permanently lubricated motors and oil-impregnated gear-train components for maintenance-free operation.
• Manual Stroke Adjustment: Built-in mechanical stops allow technicians to field-limit rotation between 0 and 95 degrees.

Is the MEP-4003 a direct replacement for the MEP-5003 series?
Yes, the MEP-4003 is the recommended replacement for discontinued MEP-5003/5061/5071 series actuators. If using this for a ball valve application, ensure you utilize the HMO-4004 kit or the proper "V" model linkage.

Does this unit provide feedback for building automation systems?
The standard MEP-4003 does not provide 0-10VDC feedback. For applications requiring a 10K ohm potentiometer feedback, you would typically look at the MEP-4013 model.

Can this actuator be used in outdoor environments?
This specific model is NEMA 1/IP40 rated. For applications exposed to moisture or debris, an HCO-1151 weather enclosure is required to protect the internal electronics.

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.