Belimo NM230A-S damper actuator for HVAC air dampers up to approx. 2 m²; AC 100–240 V (85–265 V), open/close + 3-point, 10 Nm, IP54 / NEMA 2, 150 s/90°, with integrated adjustable auxiliary switch (1x SPDT) and lockable manual override
Product information "Belimo NM230A-S Damper Actuator (10Nm, 230V-Class, On/Off & 3-Point, Aux Switch)"
The Belimo NM230A-S is a compact rotary actuator used to adjust HVAC air dampers in technical building installations. It supports open/close and 3-point (floating) control, and includes an integrated auxiliary switch (adjustable 0…100%) for end-position signalling, interlocks, and alarms to BMS/control panels.
It is designed for simple, direct mounting using a universal shaft clamp and includes an anti-rotation mechanism to prevent the actuator body from turning. A lockable push-button manual override supports commissioning and service. The actuator is overload protected and automatically stops when the end stop is reached, eliminating the need for external limit switches.
Applications
AHU fresh air / return air / exhaust air dampers
Zone dampers in ducted HVAC systems
Fan interlocks and damper proof (via integrated aux switch)
3-point floating control sequences from BMS/DDC panels
