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White wall-switch countdown timer with digital controls

TORK nsi

TORK nsi SS403 Countdown Timer White 120-277V AC

SKU CH-H9X5-VABVN

Wall-switch countdown timer with 5-minute to 24-hour range, 16 A rating, and digital control for 120/277 V AC loads

  • Full digital control simplifies scheduling
  • Energy-saving design meets ASHRAE 90.1 and IECC
  • California Title 24 compliant for regulated projects
  • Wide 120-277V AC range fits many supplies
  • 16 A rating handles up to 4400 W loads

Timer for lighting and motor loads

The TORK nsi SS403 is a wall-mounted countdown timer designed to switch 120/277 V AC circuits up to 16 A. It handles resistive loads to 380 W at 120 V and 4400 W at 277 V, plus 1/2 hp motor loads, making it suitable for commercial lighting, ventilation fans or similar single-circuit control.

Check voltage, gang space and wiring

Verify the supply is 120 V or 277 V AC and that the load does not exceed 16 A or the stated wattage limits. The device fits a single-gang box and requires a neutral connection for its electronic circuitry; confirm the existing box has sufficient depth for the 1 1/2 in body and that local code permits the 3-way switching configuration.

Digital setting with compliance marks

The white thermoplastic housing carries a full digital interface for setting delays from 5 minutes to 24 hours with a single on/off cycle per activation. It meets ASHRAE 90.1, IECC and California Title 24 requirements, so the timer can be used in energy-code-driven projects without additional certification steps.

Highlights

  • Full digital control simplifies scheduling
  • Energy-saving design meets ASHRAE 90.1 and IECC
  • California Title 24 compliant for regulated projects
  • Wide 120-277V AC range fits many supplies
  • 16 A rating handles up to 4400 W loads

Specifications

BrandNSI TORK

Questions about this item

What comes with the TORK nsi SS403 timer and what must be purchased separately?

The package includes the SS403 countdown timer unit only. No mounting hardware, wiring connectors, cover plate or additional accessories are supplied, so those items must be sourced separately for installation.

How do I choose between the 120 V and 277 V versions of the SS403?

The SS403 is a single dual-voltage unit rated for both 120 V AC and 277 V AC; there is no separate version to select. Wire it to the supply voltage present at the installation site.

What does the 16 A rating mean when the timer controls a real load?

The 16 A rating allows up to 380 W at 120 V AC or 4400 W at 277 V AC for resistive loads, and up to 1/2 hp motor load at 120 V AC; do not exceed these limits in actual use.

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