Intermatic - 156T1978A Time Switch Tripper Kit

Quick Navigation: Overview • What’s Included • Compatibility • Key Features • Common Uses

Intermatic Timer Replacement Trippers – ON/OFF Tripper Pack

Replace worn or missing Intermatic timer trippers and restore proper switching to your mechanical time switch. These components physically engage the timer dial to trigger ON and OFF events—without them, your timer will spin but won’t switch.

This Intermatic replacement tripper kit is designed for T100 Series mechanical timers, including the Intermatic T104-70 Heavy Duty Timer , making it an ideal replacement or add-on for expanding your scheduling options.

What’s Included

• 1 × Green ON Tripper – For T100 Series timers (including T104).
• 1 × Silver ON Tripper – For select alternate Intermatic models.
• 2 × Gold OFF Trippers – Universal OFF trippers for Intermatic mechanical timers.

Compatibility

Designed for Intermatic mechanical time switches, especially the widely used T100 Series. ON trippers are model-specific, while OFF trippers are generally interchangeable across compatible models.

Important: Always confirm your timer model (printed inside the cover) before installation to ensure correct fitment.

Key Features

• Direct replacement trippers for Intermatic mechanical timers.
• Restores switching function when original trippers are worn or missing.
• Colour-coded ON trippers for correct model matching.
• Universal OFF trippers for flexible scheduling.
• Tool-free installation – clips directly onto the timer dial.
• Allows additional ON/OFF events beyond the factory configuration.

Common Uses

These Intermatic timer trippers are used anywhere a mechanical timer controls electrical equipment:

• Hydroponic grow lights and environmental controls
• Fans, pumps, and dosing systems
• Pool pumps and filtration systems
• Outdoor and security lighting
• Water heaters and circulation systems
• Greenhouse irrigation and misting systems
• Retail signage and display lighting
• Industrial and warehouse lighting

Shipping Note

Due to carrier pricing structures, shipping costs on small items like timer trippers can appear disproportionately high. This is not based on weight alone—minimum parcel charges, tracking, and handling requirements all factor into the final rate.

To get the best value, we strongly recommend bundling this item with other products, such as a full timer or additional grow equipment. For example, pairing this with the Intermatic T104-70 Heavy Duty Timer helps offset shipping costs and ensures you have a complete, ready-to-run setup.

If your timer dial rotates but nothing switches, worn or missing trippers are one of the most common causes—this kit is the fastest and most cost-effective way to fix it.