TORK nsi
TORK nsi SS20F Timer 18 hr 24-277V 7.25A Wall Switch White
Electronic countdown timer with 18-hour maximum, 24-277V AC range, and flicker warning
- Sets lights to turn off automatically after up to 18 hours
- Works on 24 to 277 volt circuits for flexible installs
- Handles 7.25 amps and up to 1/2 hp at 240 volts
- Flicker warning alerts you before the cycle ends
- Tamper-resistant wall-switch design fits a single-gang box
What this timer controls
The TORK nsi SS20F is a countdown timer built into a single-gang white wall switch. It handles 24 to 277 V AC loads up to 7.25 A and 150 W. The unit provides one on/off cycle with a maximum run time of 18 hours and a minimum setting of 1 minute. It is suited for lighting or small motor circuits in commercial or residential wiring.
Thermals noise and power draw
The electronic switch operates silently with no moving contacts to generate heat or noise. Power consumption is 12 W at 24 V and 150 W at 277 V, reflecting the load rather than internal draw. A flicker warning alerts occupants before the timed cycle ends, avoiding sudden darkness in occupied spaces.
What the bundled features change
Full digital control sets the countdown without mechanical dials, and the tamper-resistant face deters unauthorised adjustment. The 1/6 hp rating at 120 V and 1/2 hp at 240 V allow direct control of small fans or pumps. cULus listing confirms compliance with North American safety standards for the stated voltages.
Highlights
- Sets lights to turn off automatically after up to 18 hours
- Works on 24 to 277 volt circuits for flexible installs
- Handles 7.25 amps and up to 1/2 hp at 240 volts
- Flicker warning alerts you before the cycle ends
- Tamper-resistant wall-switch design fits a single-gang box
Specifications
| Brand | NSI TORK |
|---|
Questions about this item
How do I wire the 24-277V AC supply to the SS20F timer, and what is the common mistake with the neutral connection?
Connect line and load to the two screw terminals; the unit requires a neutral for its electronics, so omitting the neutral is the step most installers miss.
Which component will need replacement first on the SS20F timer?
The internal relay contacts rated at 7.25 A and 1/6 hp at 120 V will wear out before the digital circuitry.
What is the first limit reached during a continuous 18-hour cycle on the SS20F timer?
The maximum single-cycle setting of 18 hours is reached; the timer then switches off and must be manually restarted.
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