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Siemens Actuator: Dampers/Economizers, On/Off, Spring Return, 20 in-lb, 120V AC - Fail-Safe Actuators with Spring Return
SiemensFail-Safe Actuators with Spring Return

Siemens Actuator: Dampers/Economizers, On/Off, Spring Return, 20 in-lb, 120V AC

The SIEMENS GQD221.1U is a fail-safe actuator with spring return for dampers and economizers, featuring a self-centering shaft coupling and 90° stroke with CW/CCW rotation. It operates on 120V AC input with a 2 to…

SKU 3G-OTH-67062

Brand
Siemens
Item
Actuator: Dampers/Economizers, On/Off, Spring Return, 20 in-lb, 120V AC
Category
Fail-Safe Actuators with Spring Return
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Technical Specifications

Siemens
Manufacturer Part Number
GQD221.1U
Type
On/Off, Spring Return, 20 in-lb, Hardwired, NEMA 1 / IP40
AC
120V
Shaft Type
Self-Centering Shaft Coupling
Input Voltage
120V AC
Output Signal
2 to 10V DC
Plenum Rating
Not Plenum Rated
Stroke Degree
90°
Shaft Rotation
CW/CCW
Auxiliary Switch Included
No
Electrical Connection Type
Hardwired
For Use With Building Automation Systems
Building Automation System Compatible
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS GQD221.1U is a fail-safe actuator with spring return for dampers and economizers, featuring a self-centering shaft coupling and 90° stroke with CW/CCW rotation. It operates on 120V AC input with a 2 to 10V DC output signal, is hardwired, and is compatible with building automation systems.

Frequently Asked Questions

What is the Siemens GQD221.1U actuator used for?

The Siemens GQD221.1U is a fail-safe spring return actuator used to control dampers and economizers in HVAC building automation systems. It provides 20 in-lb torque with a 90° stroke and CW/CCW rotation, ensuring reliable damper positioning in commercial ventilation applications.

What are the specifications of the Siemens GQD221.1U actuator?

The Siemens GQD221.1U operates on 120V AC input with a 2 to 10V DC output signal. It features a self-centering shaft coupling, 90° stroke, CW/CCW rotation, and hardwired electrical connection. It is NEMA 1 / IP40 rated, not plenum rated, and compatible with building automation systems.

Where to buy the Siemens GQD221.1U actuator worldwide?

3G Electric supplies the Siemens GQD221.1U actuator worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time on this fail-safe spring return actuator.

How to install the Siemens GQD221.1U actuator?

Mount the actuator directly onto the damper shaft using the self-centering coupling, ensuring the shaft rotates freely. Connect 120V AC power and the 2 to 10V DC control signal per the wiring diagram. Verify the spring return direction (CW/CCW) matches damper fail-safe position before commissioning.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens fail-safe actuators with spring return. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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