Belimo LRF230-S Fail-Safe Rotary Actuator 4Nm AC Open/Close 2 SPDT IP54

The Belimo LRF230-S is a compact rotary actuator with integrated spring-return fail-safe function, designed for direct mounting on 2-way and 3-way ball valves in HVAC and building automation systems. It provides reliable open/close control with automatic return to the de-energised closed (NC) position upon power loss, ensuring safety in heating, cooling, and fluid control applications.

Key Features

• Torque: 4 Nm (motor and fail-safe) – ideal for characterised control and open/close ball valves up to DN50.
• Nominal Voltage: AC 100...240 V (50/60 Hz), wide range operation (85...265 V).
• Control: 2-point open/close.
• Fail-Safe: De-energized closed (NC) – valve returns to closed position (A–AB = 0%) on power failure (suitable for L-bore valves where open position may vary).
• Running Times: Motor 75 s / 90°; fail-safe <20 s (at -20...50°C), max. 60 s at -30°C.
• 2 Integrated Auxiliary Switches: Fixed at 10° and 85° for position feedback;
• Simple Direct Mounting: One-screw installation on Belimo ball valves; 90° rotatable mounting orientation.
• Manual Override: Hand crank for manual operation, lockable in any position; auto-unlocks on power application.
• High Reliability: Overload-protected, no limit switches needed, stops automatically at end position. Mechanical position indication.
• Robust Design: IP54 protection, maintenance-free, parallel operation possible (observe power data).
• Operating Limits: Ambient -30...50°C; storage -40...80°C; max. 95% RH (non-condensing). Weight approx. 1.8 kg.
• Cables: 1 m pre-wired (2x 0.75 mm² for supply/control; 6x 0.75 mm² for auxiliaries).

Applications

• On/off control of ball valves in HVAC water systems (heating/cooling circuits, chilled water, etc.)
• Fail-safe shut-off for pumps, chillers, or energy management
• Position signaling in building automation

Lead-time: 2-8 weeks