NSi Industries 24-Hour Time Sw...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$257.87
NSi Industries 24-Hour Time Switch, 40A DPDT, 120-277V NEMA 3R Outdoor

NSi Industries 24-Hour Time Switch, 40A DPDT, 120-277V NEMA 3R Outdoor

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Model: TU40

In Stock (leaves warehouse same day if ordered before 3pm ET)

$257.87
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NSi Industries 24-Hour Time Switch, 40A DPDT, 120-277V NEMA 3R Outdoor

The NSi Industries 24-Hour Time Switch is a 40A DPDT auto-voltage timer built for reliable, scheduled control of outdoor and commercial electrical loads. Rated for 120-208-240-277 VAC operation and housed in a NEMA 3R plastic indoor/outdoor enclosure, this cULus listed time switch is engineered to automate lighting, pumps, signs, air conditioning, water heaters, and fan control circuits with dependable 24-hour scheduling.

Key Features

  • 24-Hour Scheduling: Type 24 Hour Time Switch design allows automated daily on/off scheduling for connected loads.
  • DPDT Switching Action: Double-pole double-throw contact configuration provides flexible dual-circuit switching control.
  • 40A Auto-Voltage Rating: Rated 40A with a 120-208-240-277 VAC contact rating, allowing use across multiple common voltage systems without needing a dedicated model per voltage.
  • Screw Mount Installation: Screw mounting simplifies secure installation into enclosures or panels.
  • 60 Hz Frequency Rating: Matched to standard 60 Hz electrical systems for consistent timing accuracy.
  • Wide Operating Temperature Range: Rated from -31 to 116 F, supporting reliable operation in demanding outdoor and seasonal temperature extremes.
  • NEMA 3R Plastic Enclosure: Indoor/outdoor rated plastic housing protects internal components from rain and outdoor exposure.

Certifications & Compliance

  • cULus Listed
  • NEMA 3R Rated Enclosure
  • Suitable for Indoor/Outdoor Use

Technical Specifications

  • Brand Name: NSi

Typical Applications

  • Outdoor and Landscape Lighting Control
  • Pump Control Systems
  • Illuminated Sign Scheduling
  • Air Conditioning Equipment Control
  • Water Heater Timing Control
  • Fan Control and Ventilation Scheduling

Why NSi Industries?

NSi Industries builds this 24-Hour Time Switch with a cULus listed rating and a NEMA 3R plastic enclosure suited for both indoor and outdoor installations, giving electrical professionals a dependable timing solution for demanding environments. The 40A DPDT auto-voltage design supports 120-208-240-277 VAC systems, reducing the need for multiple SKUs across different voltage applications. With a wide -31 to 116 F operating range and 60 Hz frequency rating, this NSi Industries time switch delivers consistent, code-compliant performance for lighting, pump, sign, HVAC, water heater, and fan control applications in commercial and light industrial settings.

Manufacturer Resources

Spec Sheet

Product Specs

Mounting Method:
Screw Mount
Action:
DPDT
Amperage Rating:
120-208-240-277 VAC
Standards:
cULus
Product Type:
Time Switch
Operating Temperature:
-31 to 116 F
Scheduling:
24 Hour
Brand Name:
NSi
Frequency Rating:
60 Hz
Configuration:
NEMA 3R Plastic Indoor-Outdoor
Application:
Lighting-Pumps-Signs-Air Conditioning-Watr Heaters-Fan Control
Product Material:
Plastic
Listing:
cULus
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Lighting Controls & Sensors

NSi TU40 – Frequently Asked Questions

1) Can the NSi TU40 time switch be mounted outside on a pole or exterior wall?
Yes. The TU40 comes in a NEMA 3R plastic indoor/outdoor enclosure, so it is rated for rain exposure on an exterior wall or in an outdoor equipment area. It attaches by screw mount, and the plastic housing operates from -31 to 116 F, which covers most seasonal extremes in North American climates.
2) Will the NSi TU40 timer work on a 277V lighting circuit, or do I need a different model for each voltage?
One model covers it. The TU40 is an auto-voltage timer rated 120-208-240-277 VAC at 60 Hz, so the same unit goes on a 120V landscape lighting circuit or a 277V commercial lighting branch without ordering a voltage-specific version. That is the main reason facility and MRO buyers standardize on it across a mixed-voltage building.
3) What does DPDT mean on a time switch like the NSi TU40, and when do I need it instead of a single-pole timer?
DPDT is double-pole double-throw: two sets of contacts that transfer together, each with a normally-open and a normally-closed side. On the TU40 that lets you switch both legs of a 240V load, or run two separate circuits off one schedule, or energize one circuit while de-energizing another at the same time of day. A single-pole timer only breaks one conductor and only turns one circuit on or off, which is fine for a straight 120V lighting load but not for two-pole 240V equipment like a water heater or a pump.
4) Is the NSi TU40 big enough for a pool pump or a rooftop AC circuit?
The TU40 is a 40A time switch, which covers typical pool and irrigation pump motors, illuminated sign circuits, air conditioning equipment, water heaters, and fan/ventilation loads. Size it against the nameplate amps of the equipment plus any code-required derating for a continuous or motor load; if the circuit exceeds 40A, this is not the right switch.
5) Will an inspector accept the NSi TU40 on a commercial job?
The TU40 is cULus listed, meaning it carries UL recognition for both the US and Canada, and the enclosure is NEMA 3R rated for outdoor use. Those are the two listings an electrical inspector normally looks for on an exterior time switch.
6) Does the NSi TU40 time switch handle astronomical dusk-to-dawn, or only a fixed daily schedule?
It is a 24-hour time switch, so it repeats the same on/off times every day from the trippers you set. It does not track sunrise and sunset, so as day length changes through the year you either reset the trippers seasonally or pair the timer with a photocontrol to pick up dusk. For pure dusk-to-dawn lighting with no schedule, a photocell alone is the simpler choice.
7) Can the NSi TU40 be used on 50 Hz power or a generator?
No. The TU40 is rated 60 Hz, and a synchronous-motor time switch keeps time off the line frequency, so running it on 50 Hz power throws the schedule off. Keep it on standard 60 Hz utility power.
8) What is the NSi part number for the 40A 24-hour outdoor timer, and is it a plastic or metal enclosure?
NSi Industries model TU40. The housing is plastic, in a NEMA 3R indoor/outdoor configuration. If your spec calls for a metal NEMA 3R case, this is not the one to quote.
9) Will the NSi TU40 timer keep running in freezing winter conditions?
Rated down to -31 F and up to 116 F, so it stays in spec through hard winter nights and summer rooftop heat. That range is why it gets used on unheated exterior walls and in outdoor pump houses rather than only in conditioned spaces.
How fast can I get the NSi TU40 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the NSi TU40 come with a warranty?
Absolutely. The NSi TU40 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the NSi TU40?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the NSi TU40 from ZenSupply?
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