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SiemensFail-Safe Actuators with Spring Return

Siemens Actuator: Dampers, On/Off, Spring Return, 62 in-lb, 24V AC/DC, Hardwired

The Siemens GMA121.1U is a fail-safe damper actuator with spring return, featuring a self-centering shaft coupling and CW/CCW rotation. It operates on 24V AC/DC with a 3.5W power rating and provides a 0 to 10V DC…

SKU 3G-OTH-68380

Brand
Siemens
Item
Actuator: Dampers, On/Off, Spring Return, 62 in-lb, 24V AC/DC, Hardwired
Category
Fail-Safe Actuators with Spring Return
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Technical Specifications

Siemens
Manufacturer Part Number
GMA121.1U
Type
On/Off, Spring Return, 62 in-lb, Hardwired, NEMA 1 / IP54
AC/DC
24V
Shaft Type
Self-Centering Shaft Coupling
Power Rating
3.5W
Input Voltage
24V AC/DC
Output Signal
0 to 10V DC
Plenum Rating
Not Plenum Rated
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 GMA121.1U is a fail-safe damper actuator with spring return, featuring a self-centering shaft coupling and CW/CCW rotation. It operates on 24V AC/DC with a 3.5W power rating and provides a 0 to 10V DC output signal. This hardwired actuator is Building Automation System Compatible and has a torque rating of 62 in-lb, with a NEMA 1 / IP54 enclosure.

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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