The Siemens GAP191.1P is a fast-running, fail-in-place rotary damper actuator from the OpenAir line, delivering 53 in-lb [6 Nm] of torque and driving a damper 90° in under 2 seconds. One model accepts virtually any control input — 2-position, floating, modulating 0(2)-10 VDC or 0(4)-20 mA, and Siemens FHC/LRC pulsed — with 0-10 VDC position feedback standard. It runs on 24 VAC/DC, uses a brushless DC motor with stall protection and a self-centering shaft coupling, and holds its last position on power loss (fail-in-place). (For end-position signaling, the GAP196.1P adds two adjustable auxiliary switches.)
Specifications sourced from the official Siemens Technical Instructions 155-771 (2024-08-23).
Overview
Siemens OpenAir GAP-Series actuators are fast-running, direct-coupled electronic damper actuators for laboratory fume hoods, constant- and variable-air-volume systems, and supply/exhaust terminal units. The GAP191.1P produces 53 in-lb [6 Nm] (up to 142 in-lb [16 Nm] maximum) and completes a 90° stroke in under two seconds. A single universal model covers 2-position, floating, and modulating control plus the Siemens FHC/LRC pulsed signal, with 0-10 VDC feedback standard. Because it is fail-in-place, the actuator holds its last commanded position when power is lost rather than spring-returning. It is UL and cUL listed and plenum-rated (UL 1995).
Best for
- Laboratory fume hood control where fast response is critical
- Variable-air-volume (VAV) supply and exhaust terminals
- Constant-volume damper control needing universal signal flexibility
- Applications that should hold position on power loss (fail-in-place)
Key Features
Fast 2-Second Runtime
Drives a damper through 90° in under two seconds — ideal for fume hoods and fast VAV control.
One Universal Model
Accepts 2-position, floating, modulating 0(2)-10 VDC / 0(4)-20 mA, and Siemens FHC/LRC pulsed control — selectable on a single part number, with 0-10 VDC feedback standard.
Fail-in-Place
Holds the last commanded position on power loss (no spring return). Manual override is available for setup and service.
Brushless DC Motor
Brushless DC motor technology with stall protection for highly accurate positioning and long service life (100,000 full cycles).
Self-Centering Coupling
A unique self-centering shaft coupling fits round shafts 1/4-3/4 in. and square shafts 1/4-1/2 in. for fast, repeatable mounting.
UL Listed & Plenum Rated
UL 873 and cUL listed and approved for plenum installation (UL 1995); NEMA 1 die-cast aluminum housing.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens (OpenAir) |
| Part Number | GAP191.1P |
| Actuator Type | Fail-in-Place (Non-Spring-Return) Rotary Damper Actuator |
| Nominal Voltage | 24 VAC / 24 VDC (±20%) |
| Nominal Frequency | 50/60 Hz |
| Power Consumption | Running 28 VA / 19 W; Holding 8 VA / 5 W |
| Torque (Running) | 53 in-lb [6 Nm] |
| Torque (Maximum) | 142 in-lb [16 Nm] |
| Control Signal | Universal — one model accepts 2-position, floating, modulating 0(2)-10 VDC / 0(4)-20 mA, and Siemens FHC/LRC pulsed |
| Modulating Input | 0(2)-10 VDC (max. 35 VDC), input resistance > 15 kΩ, repositioning resolution 0.4% |
| Position Feedback | 0-10 VDC (max. ±1 mA) — standard on all models |
| Angle of Rotation | 90° nominal (95° maximum) |
| Running Time | < 2 seconds for 90° (fast-running) |
| Behavior on Power Loss | Holds last position (fail-in-place; no spring return) |
| Manual Override | Yes (manual override capability) |
| Motor | Brushless DC with stall protection |
| Shaft Coupling | Self-centering; round 1/4-3/4 in. [6.4-20.5 mm], square 1/4-1/2 in. [6.4-13 mm] |
| Minimum Shaft Length | 3/4 in. [20 mm] |
| Electrical Connection | 3 ft [0.9 m] prewired cable |
| Equipment Rating | Class 2 (UL/CSA); Class III per EN 60730 |
| Enclosure | NEMA 1; IP54 per EN 60529 (limited mounting positions) |
| Housing Material | Die-cast aluminum alloy; silicone-free gear lubrication |
| Ambient Temperature | 0°F to 122°F [-18°C to 50°C] |
| Agency Listing | UL 873 listed; cUL (CSA C22.2 No. 24-93); plenum-rated per UL 1995 |
| Service Life | 100,000 full-stroke cycles; 7,000,000+ repositions |
| Dimensions (H x W x D) | 8-3/8 x 3-1/4 x 2-3/8 in. [212 x 83 x 60 mm] |
| Weight | 3 lb 6 oz [1.26 kg] |
| Warranty | 5 Years (60 months) |
Documentation
Related Products
Accessories & Mounting
Common Siemens OpenAir accessories for mounting and setting the GAP191.1P, drawn from the GAP series documentation.
Frequently Asked Questions
What is the Siemens GAP191.1P?
The Siemens GAP191.1P is an OpenAir fast-running, fail-in-place rotary damper actuator. It produces 53 in-lb [6 Nm] of torque, drives 90° in under 2 seconds, runs on 24 VAC/DC, and accepts universal control (2-position, floating, modulating, or Siemens FHC/LRC pulsed) with 0-10 VDC feedback.
Is the GAP191.1P spring-return?
No. The GAP191.1P is fail-in-place (non-spring-return): on power loss it holds its last position rather than driving to a fail-safe position. If you need spring-return fail-safe operation, Siemens offers the matching GNP191.1P / GNP196.1P models.
What control signals does the GAP191.1P accept?
One model is universal: 2-position, floating, modulating 0(2)-10 VDC or 0(4)-20 mA, and the Siemens FHC/LRC pulsed signal. A 0-10 VDC position-feedback output is standard. The mode is set with the actuator's DIP switches.
How fast is the GAP191.1P?
It is a fast-running actuator — under 2 seconds for a full 90° stroke — which makes it well suited to laboratory fume hoods and fast VAV control.
What shaft sizes does the GAP191.1P fit?
Its self-centering coupling fits round damper shafts from 1/4 to 3/4 in. (6.4-20.5 mm) and square shafts from 1/4 to 1/2 in. (6.4-13 mm); minimum shaft length is 3/4 in. (20 mm).
Does the GAP191.1P have auxiliary switches?
No. The GAP191.1P has no auxiliary switches. For two adjustable SPDT auxiliary switches in the same actuator, choose the GAP196.1P.
Is the GAP191.1P UL listed and plenum rated?
Yes. The GAP191.1P is UL 873 listed and cUL listed (CSA C22.2 No. 24-93), and Underwriters Laboratories approved it for plenum installation per UL 1995.
Does the GAP191.1P have a manual override?
Yes. The GAP191.1P provides manual override capability for setup and service (after the shaft adapter and position indicator are mounted).
Is the Siemens GAP191.1P available from an authorized distributor?
Yes. ZOT Supply stocks the Siemens GAP191.1P. Units ship factory new with the Siemens 5-year (60-month) limited warranty and application support.
- Actuator Type:
- Non-Fail-Safe
- Torque:
- 53 in-lb
- Control Signal:
- Universal (Multi-Function)
- Voltage:
- 24 VAC/DC
- Running Time:
- Fast (2 s)
- Feedback Signal:
- 0-10 VDC
- Enclosure:
- NEMA 1
- Auxiliary Switch:
- No
- Series:
- GAP
