The Belimo NRF24A-MP is a high-performance ball valve rotary actuator that combines modulating control with MP-Bus communication and a spring-return fail-safe. In conventional mode it follows an analogue 2–10 V control signal; in MP-Bus mode it receives digital position commands from a higher-level controller. Position feedback is available as 2–10 V (analogue mode) or via MP-Bus.

A key advantage is the built-in sensor-signal conversion: you can connect a passive/active sensor or switching contact, and the actuator transfers that sensor value to the controller through MP-Bus, acting as an analogue/digital converter.

On power loss, the actuator drives the valve to the fail-safe position: de-energised closed (NC). It supports simple mounting (90° steps), overload protection (no limit switches required), and manual operation with a hand crank and locking switch.

Applications

• Communicative MP-Bus ball valve control in HVAC hydronic systems
• Fail-safe shutoff (NC) for coils, branches, isolation and safety functions
• BMS projects needing modulating control + verified feedback
• Sites where sensor data (temperature/pressure/switch contact) is sent via MP-Bus through the actuator