Intermatic 156T1978A Trippers

Ensure reliable automated switching for your heavy-duty electrical loads with the Intermatic 156T1978A Trippers. As a staple in any contractor’s truck, this mechanical timer replacement part is specifically engineered for compatibility with the Intermatic T100 Series, T7000 Series, and WH40 time switches. This OEM set includes 1 ON tripper (green/silver) and 1 OFF tripper (gold/brass), allowing for precise scheduling of pool pumps, HVAC equipment, and industrial lighting. Constructed from heavy-duty metal, these "timer dogs" are designed to withstand high-cycling environments and commercial-grade 40-amp resistive loads. Whether you are replacing a missing pin or adding extra set points for complex energy management, these trippers provide the physical engagement necessary for the timer mechanism to toggle flawlessly. For a secure fit, hand-tighten the set screw onto the 24-hour dial and finish with a 1/16th turn using needle-nose pliers to avoid slipping during operation.

• Universal Series Compatibility: Fits T101, T103, T104, and T170 series mechanical time switches.
• High Load Rating: Designed for use with systems rated up to 40 Amps per pole.
• Industrial Durability: Rugged metal construction prevents the common bending or snapping associated with plastic alternatives.
• Precise Scheduling: Enables a minimum of one hour between ON and OFF cycles for efficient energy control.
• Tool-Free Initial Setup: Slotted design allows for quick sliding onto the timer dial edge.

Will these trippers work with my T104 pool timer?
Yes, the 156T1978A is the standard replacement tripper set for the T104, T101, and the entire T100 mechanical series.

How many sets of trippers can I add to one timer?
Most Intermatic T100 series dials can accommodate up to 12 ON/OFF sets (24 trippers total) for multiple cycles per day.

Why is my timer not turning off even with the tripper installed?
Ensure the tripper is tightened correctly. A loose tripper may fail to engage the internal trip lever, or it may have been installed on the wrong side of the dial pins.

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.