Intermatic Time Switch Trippers for T100 Series Timers | 156T1978A
Intermatic
SKU: 156T1978A
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.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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