Intermatic 156T1978A Replacement Timer Trippers (1 ON / 2 OFF) for T-Series Mechanical Timers
Intermatic 156T1978A is an extra/replacement ON/OFF tripper set used to replace missing trippers or add additional switching setpoints on compatible Intermatic mechanical time switches. Trippers clamp onto the timer dial and trigger the timer’s switching lever at the programmed times.
Key Features
- Part Number: 156T1978A
- Brand: Intermatic
- Product Type: Mechanical timer trippers (set)
- Kit Quantity: 1 ON tripper + 2 OFF trippers
- Color-coded metal construction for quick identification and durability
- Used to replace lost trippers or add additional ON/OFF operations
- Designed for compatible Intermatic T-series mechanical timer dials
Common Compatibility
Commonly used with Intermatic mechanical timers and mechanisms in these families (verify your exact model before ordering):
- T100 Series time switches and mechanisms (common pool timer family)
- T170 Series time switches
- T7000 Series time switches
- WH Series / WH40 water heater timers
Applications
- Pool pump timer schedule adjustments (additional run windows)
- Outdoor lighting control
- Fans, motors, and general time-based ON/OFF scheduling
- Replacing missing or damaged trippers on existing Intermatic mechanical timers
Usage Notes
- Confirm your timer is an Intermatic mechanical dial-type unit that accepts clamp-on trippers.
- Position trippers on the dial for your desired ON/OFF times, then tighten securely.
- If the dial is not advancing, you may also need a replacement clock motor (model dependent).
Related Products
- Intermatic 156T1978A Trippers
- Intermatic Timer Trippers
- Intermatic Pool Timers
- Intermatic Timer Motors
- Pool Timer Replacement Parts
Maintenance Tips
- Inspect trippers seasonally and re-tighten if they loosen from vibration.
- Replace worn trippers if switching becomes inconsistent or slips on the dial.
- Keep the timer enclosure closed to reduce moisture, corrosion, and debris buildup.
