Intermatic T104 Timer

The Intermatic T104 Mechanical Time Switch is the industry standard for reliable, 24-hour heavy-duty load control. Specifically engineered for 208-277 VAC applications, this Double-Pole Single-Throw (DPST) timer is built to handle up to 40 Amps resistive per pole, making it the go-to choice for contractors managing commercial lighting, pool pumps, and HVACR equipment. Featuring a rugged NEMA 1 indoor metal enclosure, the T104 utilizes a high-torque permanent magnet motor and teeter-type terminals to ensure secure copper wire connections. The mechanical dial allows for up to 12 ON/OFF operations per day with a 1-hour minimum interval, providing precise scheduling without the complexity of digital components. With a 5 HP motor rating at 240V, this timer offers the durability needed for high-demand inductive and tungsten loads in demanding environments.

• High Load Capacity: Rated for 40 Amps per pole, accommodating heavy-duty 208V-277V electrical circuits.
• DPST Switching: Provides simultaneous control of two separate power legs, essential for 240V motor and heating applications.
• Rugged Mechanical Design: Proven electromechanical gear train eliminates the risk of electronic failure and programming loss during minor power fluctuations.
• Manual Override: Integrated manual lever allows for immediate load testing and maintenance without disrupting the set schedule.
• Universal Enclosure Compatibility: The T104 mechanism fits most Intermatic metal or plastic enclosures, simplifying field replacements.

How do I wire a 240V motor to the T104?
Connect your two incoming line leads to terminals 1 and 3. Connect the two outgoing load leads to terminals 2 and 4. Ensure the timer motor leads are also connected to 1 and 3 so the clock runs continuously regardless of the switch state.

What wire gauge should be used with the 40A terminals?
The Intermatic T104 terminals accept 14 AWG to 8 AWG copper wire. For 40A circuits, 8 AWG copper is typically required to meet NEC standards and prevent terminal overheating.

Can I add more than two daily cycles?
Yes. While the unit comes with 1 set of trippers, the dial supports up to 12 ON/OFF operations per day by installing additional 156T1978A tripper pairs.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.