NSi 1109A-2 24-Hour DPST Time ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$184.39
NSi 1109A-2 24-Hour DPST Time Switch, 40A 120/208-277V

NSi 1109A-2 24-Hour DPST Time Switch, 40A 120/208-277V

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Model: 1109A

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

$184.39
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NSi 1109A-2 24-Hour DPST Time Switch, 40A 120/208-277V

The NSi Industries 24-Hour DPST Time Switch is a heavy-duty electromechanical control built for reliable, automated on/off switching of lighting and load circuits. Rated 40A at 120/208-277V with DPST (double-pole single-throw) switching action, this time switch delivers dependable 24-hour scheduling for both indoor and outdoor electrical applications. It is available in two enclosure configurations — NEMA 1 Indoor and NEMA 3 Outdoor — so you can match the housing to the installation environment while keeping the same 40A, 120/208-277V DPST switching platform. Both versions are cULus Listed and engineered to keep automated circuits running on schedule.

Key Features

  • Current Rating: 40A rated for high-capacity lighting and load-switching circuits.
  • Voltage Compatibility: 120/208-277V operation supports a wide range of commercial and industrial supply voltages.
  • DPST Switching Action: Double-pole single-throw contacts provide reliable, simultaneous circuit control.
  • 24-Hour Scheduling: Built-in 24 hour time switch mechanism automates daily on/off cycles without manual intervention.
  • Frequency Rating: Rated for 60Hz electrical systems.
  • Extreme Temperature Range: Operates reliably from -40 to 165 F, suited for demanding indoor and outdoor climates.
  • Enclosure Options: Choose from NEMA 1 Indoor or NEMA 3 Indoor-Outdoor metal housings, with the NEMA 3 version protecting internal components from dust, rain, and sleet in outdoor installations.

Certifications & Compliance

  • cULus Listed
  • NEMA 1 Indoor and NEMA 3 Indoor-Outdoor Enclosure Ratings Available

Technical Specifications

  • Product Group: Wiring Devices
  • Current Rating: 40A
  • Voltage Rating: 120/208-277V
  • Switching Configuration: DPST
  • Frequency: 60Hz
  • Operating Temperature Range: -40 to 165 F
  • Enclosure Options: NEMA 1 Indoor, NEMA 3 Outdoor

Typical Applications

  • Outdoor and Area Lighting Control
  • Street and Parking Lot Lighting Timers
  • Commercial Signage Circuit Scheduling
  • Automated Load Shedding and Switching
  • Outdoor and Wet-Location Electrical Installations (NEMA 3)
  • Commercial and Industrial Time-Based Circuit Control (NEMA 1 or NEMA 3)

Why NSi?

NSi Industries builds this 24-hour DPST time switch with a rugged metal enclosure — available in NEMA 1 Indoor or NEMA 3 Indoor-Outdoor configurations — and cULus Listing, giving electrical professionals a dependable, code-compliant option for automated circuit control across a range of demanding settings. With a 40A, 120/208-277V rating and a wide -40 to 165 F operating range, it is designed to keep lighting and load circuits running on schedule through harsh weather and heavy-duty commercial use, whatever enclosure the installation calls for.

Product Specs

Listing:
cULus
Standards:
cULus
Scheduling:
24 Hour
Product Type:
Time Switch
Department:
Electrical
Product Group:
Wiring Devices
Product Material:
Metal
Operating Temperature:
-40 to 165 F
Action:
DPST
Voltage Rating:
120/208-277V
Amperage Rating:
40A
Configuration:
2-Pole
Product Subgroup:
Lighting Controls & Sensors

NSi 1109A – Frequently Asked Questions

1) Will the NSi 1109A time switch run on 277V lighting circuits?
Yes. The 1109A is rated 120/208-277V at 60Hz, so it covers single-phase 120V, 208V and 277V commercial lighting feeds. Contacts are rated 40A, which is enough to switch a large HID or LED area lighting branch directly without a separate contactor in most cases.
2) Is the NEMA 1 version of the 1109A OK in a damp parking garage or car wash bay?
No. NEMA 1 is an indoor enclosure only, meant for dry interior spaces like electrical rooms and back-of-house. Anywhere with rain, hose-down, blowing dust or condensation, use the 1109A-O in the NEMA 3 indoor-outdoor housing.
3) I need a time switch for an outdoor parking lot lighting circuit - should I use the NSi 1109A-2 or the Wattstopper RT200?
Both are aimed at lighting control, and the split is how the schedule is set and where the control mounts. The NSi 1109A-2 is offered in a NEMA 3 Outdoor metal enclosure as well as NEMA 1 Indoor, so it can be mounted at the pole base or on an exterior wall, and it is rated from -40 to 165 F and cULus Listed. Its schedule is a repeating 24 hour cycle. The Pass & Seymour Wattstopper RT200 is an astronomic switch, so its trip points follow the seasonal daylight change. Choose the 1109A-2 when you want an outdoor-rated 40A DPST mechanical control; choose the RT200 when the lot lights need to track sunset year-round.
4) What does DPST mean on this time switch, and can I switch two separate circuits with it?
DPST means double-pole single-throw: two contacts that open and close together on one schedule. That lets you break both legs of a 208V or 277V two-wire circuit, or switch two loads at the same time, but it will not run two independent schedules and it has no normally-closed side. If you need one circuit on while another is off, you need a DPDT device.
5) Can the NSi 1109A time switch be mounted where it gets down to -40 in winter?
Yes, the rated operating range is -40 to 165 F, so cold-climate rooftop, yard and unheated mechanical room installs are within spec. Pair that with the 1109A-O NEMA 3 metal enclosure for anything exposed to weather.
6) Is the NSi 1109A approved for use in Canada?
The 1109A carries a cULus Listing, which covers both US and Canadian requirements, so it can be specified on jobs on either side of the border. Both the NEMA 1 and NEMA 3 versions carry it.
7) Do I need a lighting contactor with this, or can it switch the load directly?
For loads within 40A at 120/208-277V, the 1109A switches directly, no contactor needed. Above that, or where you are controlling multiple branch circuits, use the time switch as the pilot device driving a lighting contactor coil instead of carrying the load through it.
8) Can the Pass & Seymour Wattstopper RT200 be used as a drop-in replacement for an NSi 1109A-2?
Treat them as different controls rather than a straight swap. The NSi 1109A-2 is a DPST, 40A, 120/208-277V electromechanical 24 hour switch in a metal NEMA 1 or NEMA 3 enclosure, so a replacement needs to match the two-pole switching and the load current on the existing circuit. The Pass & Seymour RT200 is an astronomic Wattstopper control, a different scheduling method, so before substituting verify the pole configuration, load rating and enclosure environment against the circuit you are wiring into. If the existing panel schedule is a fixed daily on/off, staying with the 1109A-2 keeps the same 40A DPST platform.
How fast can I get the NSi 1109A 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 1109A come with a warranty?
Absolutely. The NSi 1109A 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 1109A?
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 1109A from ZenSupply?
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