Siemens GJD121.1U Fire and Smoke Damper Actuator 24V 2-Position Spring Return 20 lb-in

The Siemens GJD121.1U is a spring return, 2-position fire and smoke damper actuator from Siemens Building Technology's GJD Series OpenAir line. Designed for use with UL-listed smoke control dampers and combination fire/smoke rated dampers, this actuator delivers reliable, fail-safe performance in commercial HVAC applications.

The GJD121.1U operates on 24 VAC/DC and provides 20 lb-in (2 Nm) of torque with a rotary actuation style and 95° angular rotation. In the event of a power loss, the integrated spring return mechanism closes the damper in a typical 15 seconds, ensuring fail-safe operation. Normal powered drive/return time is 30 seconds.

Key Features:

• Spring return fail-safe operation — closes damper automatically on power loss
• 2-position (On/Off) control signal for simple, reliable operation
• 24 VAC/DC power supply compatibility
• 20 lb-in (2 Nm) torque output with 95° angular rotation
• 30-second powered run time; 15-second spring return time
• Built-in electronic fusible link capability — no separate components required
• NEMA 1, plenum-rated plastic housing
• 3 ft. lead cable included
• Operating ambient temperature range: 0°F to 130°F (–18°C to 55°C)
• Designed to meet UL555S for smoke damper actuators
• Certified to UL60730, cUL CSA 60730; CE conformity for Residential, Commercial, and Industrial environments

The GJD121.1U is engineered for use on UL-listed smoke control dampers and combination fire/smoke dampers in commercial buildings. Its compact profile and integrated electronic fuse link make installation straightforward and eliminate the need for additional fusible link hardware.