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Compact rectangular actuator unit with mounting bracket and lead wires

SIEMENS

SIEMENS GMA121.1P 2PT SR 24V 62LBIN PLM line protection

SKU CH-T1QT-VXQSD

Two-position spring-return actuator delivers 62 in-lb torque over 90° stroke at 24 VAC/VDC for damper control

  • Spring-return actuator restores position in 15 seconds
  • 24 VAC/VDC supply suits low-voltage control panels
  • 62 in-lb torque drives dampers reliably
  • Self-centering two-position shaft simplifies installation
  • 25 to 130 °F ambient range handles harsh environments

Two-Position Spring-Return Actuator

The Siemens GMA121.1P is a line-protection actuator built for damper control in HVAC and generator systems. It operates on 24 VAC or VDC and delivers 62 in-lb of torque through a 90-degree stroke. The self-centering shaft and spring-return action suit automated shut-off or fail-safe sequences.

Thermal Range and Power Draw

Ambient operating temperature spans -25 to 130 F, covering outdoor and mechanical-room environments. Power consumption is rated at 5 VA during normal drive cycles. The spring-return stroke completes in 15 seconds, limiting sustained current draw to the brief actuation period.

Mounting Hardware and Replacement Fit

A mounting bracket, screws and a hex key are included for direct installation without extra parts. The unit replaces Honeywell MS8110A1008 motors, using the same 3 ft 18 AWG lead connections. Buyers who need a different torque rating or a non-spring-return drive cannot use this model.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $146.99
Pricier than about 77% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

How do I install the SIEMENS GMA121.1P actuator and which step is often missed?

Mount the actuator using the included bracket screws and hex key, connect the 3 ft 18 AWG leads to 24 VAC/VDC, and set the shaft to the self-centering position; the step often missed is verifying the 90-degree stroke alignment before tightening.

What maintenance or replacement will the SIEMENS GMA121.1P need over time?

The spring-return mechanism is rated for a 15-second return cycle; plan to inspect the shaft and mounting hardware annually and replace the actuator if the return time exceeds 15 seconds or torque drops below 62 in-lbs.

What is the first limit the SIEMENS GMA121.1P hits under sustained operation?

The ambient temperature range tops out at 130 F; sustained operation above this limit will trigger thermal protection before any electrical or mechanical limit is reached.

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