Intermatic
Intermatic FF34H Spring-Wound Timer 4 Hr SPDT Silver contactor
A spring-wound timer that automatically limits run time to four hours with a SPDT silver contactor rated for 1 hp at 120 V and 2 hp at 240 V
- Spring-wound operation needs no external power
- 4-hour maximum timing cycle suits many applications
- SPDT silver contacts switch 1 hp at 120 V or 2 hp at 240 V
- cCSAus and RU listings confirm safety compliance
- Single-gang design fits standard electrical boxes
Spring-Wound Timer 4-Hour SPDT
The Intermatic FF34H is a spring-wound timer that provides up to four hours of automatic shut-off for energy-consuming loads. It uses a single-pole double-throw silver contactor rated at one horsepower at 120 volts and two horsepower at 240 volts. This mechanical timer suits installations that need a simple, non-digital time limit without external power.
Replaces manual switching or basic timers
The unit upgrades from manual on-off control or timers lacking automatic energy-limiting features. The jump is worth it when a facility wants to prevent equipment from running unattended beyond a set period. Its cCSAus and RU standards support compliance in commercial and industrial wiring projects where listed components are required.
Mechanical spring limits precision and cycle life
The spring-wound mechanism does not offer the repeatability or programmability of electronic timers. It cannot store multiple schedules, adjust for daylight changes, or interface with building automation systems. Buyers who need digital accuracy, multi-event programming, or remote monitoring should specify an electronic alternative.
Highlights
- Spring-wound operation needs no external power
- 4-hour maximum timing cycle suits many applications
- SPDT silver contacts switch 1 hp at 120 V or 2 hp at 240 V
- cCSAus and RU listings confirm safety compliance
- Single-gang design fits standard electrical boxes
Specifications
| Brand | INTERMATIC |
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Questions about this item
What size electrical box does the single-gang Intermatic FF34H timer require?
The timer is a one-gang device, so it mounts in a standard single-gang electrical box.
Which step is often missed when wiring the SPDT silver contacts on this spring-wound timer?
Connecting both the normally open and normally closed terminals for the intended control circuit is the step installers frequently overlook.
When should the silver-contactor SPDT switch be inspected or replaced on the FF34H?
Inspect the silver contacts after the timer has switched a 1 hp load at 120 V or a 2 hp load at 240 V for an extended period; replace if pitting or wear appears.
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