Belimo SM230A-S damper actuator for HVAC air dampers up to approx. 4 m²; AC 100–240 V (85–265 V), open/close + 3-point, 20 Nm, IP54 / NEMA 2, 150 s/90°, with integrated adjustable auxiliary switch (1x SPDT, 0–100%) and lockable manual override.
Product information "Belimo SM230A-S Damper Actuator (20Nm, 230V-Class, On/Off & 3-Point, Aux Switch)"
The Belimo SM230A-S is a robust rotary actuator for adjusting HVAC air dampers in technical building installations. It supports standard open/close and 3-point (floating) control wiring and includes an integrated adjustable auxiliary switch for damper end-position signalling, fan interlocks, and status feedback to BMS/DDC panels
It is designed for simple direct mounting on the damper shaft with a universal clamp and anti-rotation mechanism. The actuator is overload protected, requires no limit switches, and stops automatically at the end stop. A lockable push-button manual override supports commissioning and maintenance.
Applications
AHU fresh/return/exhaust air dampers
Large dampers up to approx. 4 m² requiring 20 Nm torque
Fan enable interlock (damper proof) using the adjustable aux switch
BMS/DDC panels using 3-point floating sequences for damper positioning
