Intermatic 208/240V 21A 24-Hour Electromechanical Timer GMXST-I-240

Product Overview

The Intermatic GMXST‑I‑240 is an indoor electromechanical 24‑hour timer rated for 208/240V service and 21A switching. It uses a mechanical dial with 15‑minute intervals and an SPDT contact configuration. Mounting options listed with the manufacturer include panel, surface, DIN‑rail, or flush mounting where the model and ratings match the application.

Manufacturer identifiers: UPC 078275153240 and model GMXST‑I‑240. Constructed with plastic components and classified as a Type 1 (indoor) enclosure.

Key Features

• 24‑hour dial with 15‑minute interval scheduling
• Rated 208/240V, 21A switching
• SPDT (single pole, double throw) contact configuration
• Type 1 (indoor) enclosure; plastic construction
• Manufacturer UPC 078275153240 for ordering and inventory

What this timer does

The GMXST‑I‑240 provides automatic on/off control on a repeating 24‑hour cycle using a mechanical dial with 15‑minute increments. It is intended for scheduled control of lighting and other loads where a daily repeating schedule is acceptable.

• Mechanical timing cam with 15‑minute resolution
• Daily repeat cycle for routine scheduled control

Voltage and load ratings

Verify the timer's electrical ratings match your circuit before selection and installation.

• Voltage: 208/240V
• Amperage: 21A (listed switching rating)
• Contact type: SPDT

Scheduling and contact configuration

Scheduling is set using the 24‑hour dial with 15‑minute intervals. The SPDT contact provides a common with normally open and normally closed positions as listed by the manufacturer.

• 15‑minute interval settings (up to 96 positions per day)
• SPDT contact offers common, NO, and NC connections

Mounting and location

The GMXST‑I‑240 is classified for indoor use (Type 1) and is described for panel, surface, DIN‑rail, or flush mounting. Confirm required mounting hardware and cutouts for the chosen installation method.

• Location rating: Type 1 (indoor)
• Mounting styles listed: panel, surface, DIN‑rail, or flush (verify fit and hardware)

Typical applications

The unit is suitable for routine scheduled control tasks in commercial and maintenance settings where an electromechanical 24‑hour timer is appropriate.

• Scheduled lighting control
• Scheduled equipment or pump control
• Facility maintenance schedules
• Like‑for‑like replacements of electromechanical timers

Ordering and identification

Use the model number and UPC to confirm the exact Intermatic unit for procurement and inventory.

• Manufacturer model/part number: GMXST‑I‑240
• UPC: 078275153240
• Brand: Intermatic

Before You Order

Confirm the model number, UPC, voltage, amperage, mounting style, and enclosure rating before ordering.

• Verify circuit voltage is 208/240V and the load does not exceed the listed 21A switching rating.
• Confirm SPDT contact arrangement fits the required control wiring.
• Check the mounting style (panel, surface, DIN‑rail, or flush) and any required hardware or cutouts.

Ordering from Lumera Electric

Check the purchasing options shown on the Lumera Electric product page for Intermatic 208/240V 21A 24-Hour Electromechanical Timer GMXST-I-240. For project quantities or additional ordering requirements, use Request a Quote and provide the required quantity.