Siemens Building Technology GRD121.1U Actuator
The Siemens GRD121.1U is a high-torque 24V fire and smoke damper actuator engineered for precise 2-position control in critical life safety systems. As a veteran technician knows, reliability in smoke containment is non-negotiable; this OpenAir electronic actuator delivers 30 lb-in of torque to ensure positive closure against high-velocity airflow. Operating on 24 VAC/DC, the GRD121.1U features a robust spring return fail-safe mechanism that triggers upon power loss or high-temperature detection, meeting the stringent UL555 and UL555S standards for smoke and combination fire/smoke dampers.
Designed for seamless field integration, this unit includes a plenum-rated cable and supports an electronic fusible link (EFL) for simplified wiring without additional junction boxes. With a 30-second drive time and a rapid 15-second closure, it provides the response speed required by modern building codes. The compact NEMA 1 housing is optimized for tight mechanical spaces, allowing contractors to complete HVAC damper actuator replacement efficiently while maintaining system integrity at temperatures up to 350°F.
Key Benefits for the Contractor
- UL Listed Reliability: Fully compliant with UL555S standards, ensuring high-performance smoke control in commercial and industrial HVAC systems.
- Fast Fail-Safe Response: Features a reliable spring return fire smoke actuator function with a 15-second maximum closing time during power interruption.
- Seamless EFL Integration: Built-in capability for electronic fusible links (165°F, 212°F, 250°F, or 350°F) simplifies job site safety testing and reduces wiring complexity.
- High-Torque Performance: Provides 30 lb-in torque, making it a versatile Siemens actuator for a wide range of damper sizes.
- Simplified Installation: Comes pre-cabled with a 3-foot 18 AWG lead, reducing labor time during fire damper actuator retrofits or new builds.
Common Questions
Is the GRD121.1U compatible with existing Honeywell or Belimo fire smoke actuators?
While footprints vary, the Siemens GRD121.1U is a direct functional equivalent for many 24V spring return damper actuators with 30 lb-in torque requirements. We recommend verifying the shaft diameter and anti-rotation bracket mounting points before installation.
Does this unit require a separate power supply for the electronic fusible link?
No. The Siemens GRD121.1U powers the EFL directly through its low-voltage side, eliminating the need for additional 120V power or dedicated conduit at the transition point.
Can this actuator be used in return air plenums?
Yes, its housing and cable are plenum-rated, making it suitable for air-handling spaces where fire and smoke containment is required by local mechanical codes.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $151.15
-65%$151.15
$52.90Siemens Building Technology GRD121.1U Actuator
The Siemens GRD121.1U is a high-torque 24V fire and smoke damper actuator engineered for precise 2-position control in critical life safety systems. As a veteran technician knows, reliability in smoke containment is non-negotiable; this OpenAir electronic actuator delivers 30 lb-in of torque to ensure positive closure against high-velocity airflow. Operating on 24 VAC/DC, the GRD121.1U features a robust spring return fail-safe mechanism that triggers upon power loss or high-temperature detection, meeting the stringent UL555 and UL555S standards for smoke and combination fire/smoke dampers.
Designed for seamless field integration, this unit includes a plenum-rated cable and supports an electronic fusible link (EFL) for simplified wiring without additional junction boxes. With a 30-second drive time and a rapid 15-second closure, it provides the response speed required by modern building codes. The compact NEMA 1 housing is optimized for tight mechanical spaces, allowing contractors to complete HVAC damper actuator replacement efficiently while maintaining system integrity at temperatures up to 350°F.
Key Benefits for the Contractor
- UL Listed Reliability: Fully compliant with UL555S standards, ensuring high-performance smoke control in commercial and industrial HVAC systems.
- Fast Fail-Safe Response: Features a reliable spring return fire smoke actuator function with a 15-second maximum closing time during power interruption.
- Seamless EFL Integration: Built-in capability for electronic fusible links (165°F, 212°F, 250°F, or 350°F) simplifies job site safety testing and reduces wiring complexity.
- High-Torque Performance: Provides 30 lb-in torque, making it a versatile Siemens actuator for a wide range of damper sizes.
- Simplified Installation: Comes pre-cabled with a 3-foot 18 AWG lead, reducing labor time during fire damper actuator retrofits or new builds.
Common Questions
Is the GRD121.1U compatible with existing Honeywell or Belimo fire smoke actuators?
While footprints vary, the Siemens GRD121.1U is a direct functional equivalent for many 24V spring return damper actuators with 30 lb-in torque requirements. We recommend verifying the shaft diameter and anti-rotation bracket mounting points before installation.
Does this unit require a separate power supply for the electronic fusible link?
No. The Siemens GRD121.1U powers the EFL directly through its low-voltage side, eliminating the need for additional 120V power or dedicated conduit at the transition point.
Can this actuator be used in return air plenums?
Yes, its housing and cable are plenum-rated, making it suitable for air-handling spaces where fire and smoke containment is required by local mechanical codes.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Siemens GRD121.1U is a high-torque 24V fire and smoke damper actuator engineered for precise 2-position control in critical life safety systems. As a veteran technician knows, reliability in smoke containment is non-negotiable; this OpenAir electronic actuator delivers 30 lb-in of torque to ensure positive closure against high-velocity airflow. Operating on 24 VAC/DC, the GRD121.1U features a robust spring return fail-safe mechanism that triggers upon power loss or high-temperature detection, meeting the stringent UL555 and UL555S standards for smoke and combination fire/smoke dampers.
Designed for seamless field integration, this unit includes a plenum-rated cable and supports an electronic fusible link (EFL) for simplified wiring without additional junction boxes. With a 30-second drive time and a rapid 15-second closure, it provides the response speed required by modern building codes. The compact NEMA 1 housing is optimized for tight mechanical spaces, allowing contractors to complete HVAC damper actuator replacement efficiently while maintaining system integrity at temperatures up to 350°F.
Key Benefits for the Contractor
- UL Listed Reliability: Fully compliant with UL555S standards, ensuring high-performance smoke control in commercial and industrial HVAC systems.
- Fast Fail-Safe Response: Features a reliable spring return fire smoke actuator function with a 15-second maximum closing time during power interruption.
- Seamless EFL Integration: Built-in capability for electronic fusible links (165°F, 212°F, 250°F, or 350°F) simplifies job site safety testing and reduces wiring complexity.
- High-Torque Performance: Provides 30 lb-in torque, making it a versatile Siemens actuator for a wide range of damper sizes.
- Simplified Installation: Comes pre-cabled with a 3-foot 18 AWG lead, reducing labor time during fire damper actuator retrofits or new builds.
Common Questions
Is the GRD121.1U compatible with existing Honeywell or Belimo fire smoke actuators?
While footprints vary, the Siemens GRD121.1U is a direct functional equivalent for many 24V spring return damper actuators with 30 lb-in torque requirements. We recommend verifying the shaft diameter and anti-rotation bracket mounting points before installation.
Does this unit require a separate power supply for the electronic fusible link?
No. The Siemens GRD121.1U powers the EFL directly through its low-voltage side, eliminating the need for additional 120V power or dedicated conduit at the transition point.
Can this actuator be used in return air plenums?
Yes, its housing and cable are plenum-rated, making it suitable for air-handling spaces where fire and smoke containment is required by local mechanical codes.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
