Intermatic T103 24-Hour Mechanical Timer Switch – 40A DPST, 120V Indoor Metal Enclosure

Overview

The Intermatic T103 24-Hour Mechanical Timer Switch is built for dependable, round-the-clock control of power in homes, workshops, and light commercial settings. This heavy-duty device is a double-pole, single-throw (DPST) timer designed for a 120V circuit and can manage substantial loads with quiet, reliable operation. It supports up to 40A per pole and is suitable for a range of equipment, from pumps to lighting, fans to HVAC components.

Key specifications at a glance

• High-load capability: 40A per pole on a 120V circuit, with compatibility for resistive, inductive, and motor loads.
• 24-hour mechanical scheduling: up to 12 programmable ON/OFF events per day, with a minimum 1-hour interval between events.
• Durable enclosure: heavy-duty indoor metal housing designed for secure mounting in utility rooms, garages, or equipment spaces.
• Includes programmable tripper set: ships with one ON and one OFF tripper, expandable to multiple cycles per day.
• Safety and compatibility: UL and CSA listed, suitable for various load types including motors and lighting systems.

Practical benefits and use cases

• Automate daily routines for pumps, water features, lights, fans, and HVAC components without ongoing manual adjustments.
• Indoor installation in clean, organized spaces like utility rooms or equipment closets keeps wiring neatly managed while providing dependable control.
• Expandable scheduling helps tailor power cycles to changing needs, saving energy with adjustable ON/OFF timing.

How to use and install

Set the dial to your desired on/off times and position the included tripper pieces accordingly. The unit offers a manual override for quick testing or temporary manual control. For longer daily schedules, you can expand from the included tripper to create up to 12 cycles per day with at least one hour between events. Proper mounting in the indoor metal enclosure helps protect the switch and the connected circuits.

Note: This timer is designed for indoor use and is compatible with a wide range of load types. It provides flexible daily scheduling without implying guaranteed results for any specific application.