Intermatic T104P3 – 24-Hour Mechanical Time Switch (208-277 VAC, DPST)

Product Overview

The Intermatic T104P3 is a heavy-duty mechanical timer switch designed for continuous 24-hour operation controlling one circuit. Ideal for applications such as pool equipment, circulating pumps, heaters, lighting and other heavy loads, it allows scheduled ON/OFF control with up to 12 operations per day.

Key Features

• Input voltage: 208-277 VAC at 60 Hz.
• Double-pole, single-throw (DPST) configuration for full isolation of load.
• High motor load ratings—supports large pumps and heavy circuits.
• Convenient one-hour minimum ON/OFF interval and provision for 12 ON/OFF cycles per day.
• Weather-resistant enclosure rated Type 3R for indoor/outdoor use.
• Includes one “ON” tripper and one “OFF” tripper for scheduling flexibility.

Technical Specifications

• Model: T104P3
• Voltage Range: 208-277 VAC, 60 Hz
• Switch Type: DPST
• Max Motor/Inductive Load: 40 A per pole (typical), up to 2 HP at 120 V, 5 HP at 240 V (check label)
• Enclosure: NEMA Type 3R Plastic, designed for outdoor/wet locations
• Minimum ON/OFF Interval: 1 hour

Applications & Compatibility

This time switch is suited for pump circuits (filtration, spa, irrigation), pool heater control, outdoor lighting, and other scheduled loads in residential and commercial pool installations. Confirm the circuit voltage (208-277 V) and that your load rating fits within the specification before selecting.

Installation Instructions

• Turn off all power to the circuit before servicing or installation.
• Mount the timer in a suitable location with clear access to set the dial.
• Wire the line (incoming supply) and load (outgoing equipment) according to the wiring diagram inside the cover.
• Set the current time of day on the dial, and install the ON/OFF trippers at your desired schedule positions.
• Close the cover, restore circuit power, and test the timer to ensure it cycles at the set times.

Troubleshooting

• No load switching at scheduled time: Verify the dial is set correctly, trippers are installed firmly, and supply/load wiring is correct.
• Timer won’t run: Check that the incoming voltage is within 208-277 V, and line connections are secure.
• Excessive load draw or tripping circuit breaker: Ensure the load does not exceed the rated motor/inductive limits; use a contactor if necessary.

Maintenance Tip

Inspect the timer annually. Confirm the enclosure is intact, the dial moves freely, and the trippers are secure. Clean out any dust or debris and make sure the manual override switch (if present) is functioning properly. Replacing worn timers before failure helps maintain scheduled operation and prevent equipment downtime.