Insulator For Single Pole Time Switches

A replacement insulator for Intermatic single-pole mechanical time switches. Intermatic titles the part Insulator for Single-Pole Time Switch and names the compatible models directly: T101, T102, T171 and T172. It is a black plastic component, made in the U.S.A., sold as an each.

Why the model list is the specification

Intermatic publishes almost nothing else about this part - no dimensions, no electrical rating, no certification of its own, because it is an internal component of a switch that carries its own approval. What the manufacturer does state is the compatibility list, and that is what governs the order. The T101 and T102 are the 24-hour dial time switches in a metal enclosure; the T171 and T172 add skip-a-day scheduling. If your time switch is one of those four and the insulator is cracked, scorched or missing, this is the correct replacement. If it is any other Intermatic series, confirm the part number with Intermatic before ordering, because these accessory numbers do not carry across families.

Specifications

Best for: maintaining installed Intermatic T101, T102, T171 and T172 mechanical time switches rather than replacing the whole switch over one damaged insulator.

Common questions

Which Intermatic time switches does this insulator fit?
Intermatic names four models directly in the product title: the T101, the T102, the T171 and the T172 single-pole mechanical time switches.

Will this insulator fit a two-pole Intermatic time switch?
Intermatic lists it only for single-pole time switches and names four specific models, so confirm the correct accessory number with Intermatic for any other series.

Does Intermatic publish dimensions for this part?
No. The manufacturer lists material, colour, country of origin and compatibility, but does not publish dimensional or electrical data for this component.

Is it worth replacing the insulator instead of the whole time switch?
Usually yes, if the enclosure, dial and contacts are sound. Intermatic sells the insulator as a stocked accessory precisely so the switch can be repaired in place.