KMC Controls MEP-3001 Actuator

The KMC Controls MEP-3001 Actuator is a field-proven solution for 24 VAC zone control and small-bore valve applications. This Normally Closed (N/C) thermal actuator is engineered for reliable 2-position (on/off) control, making it a critical component for hydronic heating and cooling systems. As a direct secondary replacement for the discontinued Siemens STA73U actuator, the MEP-3001 ensures seamless integration into existing infrastructure with its standard 24V brown actuator housing. The unit operates with a fail-safe stem-down position, providing consistent performance in high-demand environments. Designed primarily for VEP-12, VEP-22, and VEP-34 series valves, this thermal wax-driven actuator offers silent operation and a compact footprint for tight mechanical spaces. For technicians performing retrofits, this valve actuator provides a predictable installation path without complex wiring adjustments, maintaining system integrity and thermal efficiency across commercial and residential HVAC loops.

• Direct Replacement: Engineered as a drop-in replacement for the legacy Siemens STA73U, reducing downtime during maintenance.
• Fail-Safe Logic: Features a Normally Closed (stem down) fail position to protect system components during power loss.
• Universal Compatibility: Specifically optimized for KMC VEP series valves, ensuring precise seating and stroke alignment.
• Simple Technical Integration: Standard 24 VAC power requirement fits most existing low-voltage control circuits.

Is the MEP-3001 a direct fit for the Siemens STA73U?
Yes, this replacement actuator is the technical equivalent and direct replacement for the discontinued STA73U brown actuator.

Can this actuator be used with modulating signals?
No, the MEP-3001 is a 2-position on/off actuator. It requires a constant 24 VAC power signal to open and returns to the closed position via spring/internal thermal reset when power is removed.

Does this unit include an auxiliary switch?
This specific model is a standard 2-wire device without built-in auxiliary switches for end-position verification.

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.