SM24A-MOD Damper Actuator, 20 Nm, AC/DC 24 V, 150 s

On request
£164.67 £197.60

SM24A-MOD Damper Actuator, 20 Nm, AC/DC 24 V, 150 s

  • Damper actuator

  • 20 Nm, 150 s adjustable, 95°

  • AC/DC 24 V, Modbus RTU

  • IP 54, Manual override with push-button

  • Connection PVC cable 1m

  • Direction of rotation reversible (right/left)

  • Spindle driver universal spindle clamp

More Information

Mode of operation: The actuator is fitted with an integrated interface for Modbus RTU, it receives the digital positioning signal from the Modbus-Master and returns the current status.

Converter for sensors: Connection option for a sensor (passive or active sensor or switching contact). In this way, the analogue sensor signal can be easily digitised and transferred to Modbus.

Parameterisable actuators: The factory settings cover the most common applications. Single parameters can be modified with the Belimo Service Tools MFT-P or ZTH EU. The Modbus communication parameters (address, baud rate etc.) are set with the ZTH EU. Pressing push-button “Service” on the actuator while connecting the supply voltage resets the communication parameters to the factory setting. Quick addressing: The Modbus address can alternatively be set using push-buttons on the actuator from 1 to 16. The value selected is added to the «Basic address» parameter and results in the effective Modbus address. For example, with a basic address of 140, Modbus addresses between 141 and 156 can be parameterised using quick addressing.

Simple direct mounting: Simple direct mounting on the damper spindle with an universal spindle clamp, supplied with an anti-rotation device to prevent the actuator from rotating.

Manual override: Manual override with push-button possible (the gear is disengaged for as long as the button is pressed or remains locked).

High functional reliability: The actuator is overload protected, requires no limit switches and automatically stops when the end stop is reached.

Adjustable angle of rotation: Adjustable angle of rotation with mechanical end stops.

Home position The first time the supply voltage is switched on, i.e. at the time of commissioning, the actuator carries out a synchronisation. The synchronisation is in the home position (0%). The actuator then moves into the position defined by the positioning signal.

Adaption and synchronisation: An adaption can be triggered manually by pressing the “Adaption” button or with the PC-Tool. Both mechanical end stops are detected during the adaption (entire setting range). Automatic synchronisation after pressing the gearbox disengagement button is configured. The synchronisation is in the home position (0%). The actuator then moves into the position defined by the positioning signal. A range of settings can be adapted using the PC-Tool (see MFT-P documentation)

Manuals & Datasheets
Technical Information

Electrical data:

  • Nominal voltage AC/DC 24 V
  • Nominal voltage frequency 50/60 Hz
  • Nominal voltage range AC 19.2...28.8 V / DC 21.6...28.8 V
  • Power consumption in operation 3.5 W
  • Power consumption in rest position 1.4 W
  • Power consumption for wire sizing 6 VA
  • Connection supply / control Cable 1 m, 6 x 0.75 mm²
  • Data bus communication
  • Protocol Modbus RTU (RS-485), not galvanically isolated
  • Number of nodes Max. 32 (without repeater)
  • Transmission formats 1-8-N-2, 1-8-N-1, 1-8-E-1, 1-8-O-1 Default: 1-8-N-2 (start bits, data bits, parity, stop bits)
  • Baud rate 9600, 19,200, 38,400, 76,800, 115,200 Bd Default: 38,400 Bd
  • Terminating resistor 120 Ohm, can be switched
  • Parameterisation with Service Tool ZTH EU Pushbutton-operated fast addressing 1 ... 16 possible

Functional data:

  • Torque motor Min. 20 Nm
  • Torque variable 25%, 50%, 75% reduced
  • Position accuracy ±5%
  • Direction of motion motor Selectable with switch 0 / 1
  • Direction of motion note Y = 0 V: At switch position 0 (ccw rotation) / 1 (cw rotation)
  • Direction of motion variable Electronically reversible
  • Manual override Gear disengagement with push-button, can be locked
  • Angle of rotation Max. 95°
  • Angle of rotation note can be limited on both sides with adjustable mechanical end stops
  • Running time motor 150 s / 90°
  • Motor running time variable 86...346 s
  • Adaption setting range manual
  • Adaption setting range variable No action Adaption when switched on Adaption after pushing the gear disengagement button
  • Override control, controllable via Modbus MAX (maximum position) = 100%, MIN (minimum position) = 0% and ZS (intermediate position) = 50%
  • Override control variable MAX = (MIN + 32%)...100%, MIN = 0%...(MAX – 32%) and ZS = MIN...MAX
  • Sound power level motor 45 dB(A)
  • Spindle driver Universal spindle clamp reversible 10...20 mm
  • Position indication Mechanically, pluggable


  • Protection class IEC/EN III Safety extra-low voltage
  • Protection class UL UL Class 2 Supply
  • Degree of protection IEC/EN IP54
  • Degree of protection NEMA/UL NEMA 2, UL Enclosure Type 2
  • EMC CE according to 2004/108/EC
  • Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14
  • Certification UL cULus according to UL 60730-1A, UL 60730-2-14 and CAN/CSA E60730-1:02
  • Mode of operation Type 1
  • Rated impulse voltage supply / control 0.8 kV
  • Control pollution degree 3
  • Ambient temperature -30...50°C
  • Non-operating temperature -40...80°C
  • Ambient humidity 95% r.h., non-condensing
  • Maintenance Maintenance-free

Weight: 1.2 kg

Manufacturer Belimo