Belimo SF24A-MF - rotary actuator for dampers with safety function

Belimo SF24A-MF – actuator for dampers

The configurable rotary actuator with safety function is designed to position dampers in stationary heating, ventilation and air-conditioning systems. According to the technical data sheet, it supports air dampers with an area of up to approx. 4 m². During operation, the motor positions the damper according to the control signal and tensions the spring; when the power supply is interrupted, the spring moves it to the safety position.

Key features and specifications

• Rated voltage: AC/DC 24 V; frequency: 50/60 Hz.
• Motor torque: 20 Nm; safety function torque: 20 Nm.
• Control range Y: 2...10 V; position feedback signal U: 2...10 V.
• Motor running time: 150 s / 90°; adjustable motor running time: 70...220 s.
• Safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Maximum rotation angle: 95°; angle adjustment using mechanical stops.
• Universal shaft clamp for 10...25.4 mm; manual adjustment using a crank and locking switch.
• Power and control connection: 1 m cable, 4x 0.75 mm².
• Power consumption during operation: 8.5 W; in the idle position: 3.5 W; power rating for cable sizing: 11 VA.
• Protection rating: IP54; ambient temperature: -30...50°C [-22...122°F].

The motor direction can be selected using the L/R switch, while the direction of the safety function is determined by the L/R mounting method. Individual parameters can be configured using Belimo Assistant 2 or ZTH EU.