Intermatic - GMXQT-O-120 - 24-Hour 120V Electromechanical Timer with Battery Backup

IntermaticSKU: GMXQT-O-120

Sale price $148.13
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Spec Sheet  Install Manual

Intermatic GMXQT-O-120 24-Hour 120V Electromechanical Timer with Battery Backup, 15 Minute Intervals, 21A, SPDT, Type 3R Outdoor Plastic Enclosure

The GMX series time switches are universal mechanical time switches. They are a low cost alternative for applications that do not require more than 21 A or 2 HP @ 240 VAC. The timer is mounted in a UL Type 1 indoor or Type 3R outdoor plastic enclosure. The GMX is a light-duty commercial time switch ideal for 24, 120 or 208/240 VAC single-phase general applications.


  • 21 A SPDT Switch
  • UL Type 1 indoor or Type 3R outdoor plastic enclosure
  • Manual 3-way override
  • Captive trippers with 15-minute intervals on 24-hour models and 2-hour intervals on 7-day models
  • True clock face, easy to set
  • Finger-safe terminals
  • Enclosure provides space for field-added contactor or other accessories
  • Synchronous drive or quartz drive ("Q" models) with self-charging battery backup


  • Aeration
  • Air Movement & Ventilation
  • Generator Exercising
  • Refrigeration Merchandiser
  • Septic Treatment


Backup Type 72-hour Carry-over, Battery, Self-recharging Input Voltage Range(s) 120 VAC, 50/60 Hz
Mounting Options Wall Resistive 21 A, 120 VAC, 50 Hz, 21 A, 120 VAC, 60 Hz, 21 A, 208 VAC, 50 Hz, 21 A, 208 VAC, 60 Hz, 21 A, 240 VAC, 50 Hz, 21 A, 240 VAC, 60 Hz
Switch Type SPDT Enclosure Type Outdoor type 3R plastic
Has Real-time Clock Face Yes Warranty Period 1-Year limited
Wiring Option Screw terminal accepts up to #12 AWG wire Application Compatibilities CFL, Fluorescent, Incandescent, LED
Backup Protection Time 72 Hours Battery Service Type Rechargeable
Battery Type NiMh Category Timer Controls Web
Clock Drive Type Quartz Has Captive Trippers Yes
Has Finger-Safe Terminals Yes Has Override Switch Yes
Maximum Cycle Time 24 hrs Minimum Cycle Time 15 min
Motor (Three-Phase) 1 HP, 120 VAC, 50 Hz, 1 HP, 120 VAC, 60 Hz, 2 HP, 240 VAC, 50 Hz, 2 HP, 240 VAC, 60 Hz Operating Humidity 0 to 95%, Non-condensing
Operating Temperature with Battery Backup -4° F to 131° F (-20° C to 55° C) Shortest switching time ON/OFF 15 minutes
Timing Interval 15 min Tungsten (NO) 1350 W, 120 VAC, 50 Hz, 1350 W, 120 VAC, 60 Hz
Wire Size Max #12 AWG Operating Temperature Max (°C) 55
Operating Temperature Max (°F) 131 Operating Temperature Min (°C) -20
Operating Temperature Min (°F) -4 Product Depth (in) 3 3/4
Product Depth (mm) 95 Product Height (in) 10
Product Height (mm) 254 Product Width (in) 6 1/2
Product Width (mm) 165 Unit Carton Height (in) 4.125
Unit Carton Length (in) 10.125 Unit Carton Weight (lb) 1.577
Unit Carton Width (in) 6.875

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