NSi Industries 24-Hour Digital...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$403.23
NSi Industries 24-Hour Digital Time Switch, 1-Channel, 40A, 120-277V SPST

NSi Industries 24-Hour Digital Time Switch, 1-Channel, 40A, 120-277V SPST

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Model: E101B

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

$403.23
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NSi Industries 24-Hour Digital Time Switch, 1-Channel, 40A, 120-277V SPST

The NSi Industries 24-Hour Digital Time Switch is a 1-channel SPST control device built for reliable scheduling of lighting, HVAC, and pump loads. Rated 40A at 120/277 VAC, this digital time switch offers 20 ON/OFF set points and is housed in a NEMA 3R plastic enclosure suitable for indoor or outdoor mounting. Backed by cULus listing, it delivers dependable 24-hour scheduling for commercial and light-industrial applications.

Key Features

  • Switching Action: SPST (single-pole, single-throw) action across 1 channel for straightforward load control.
  • Load Rating: 40A rated at 120/277 VAC for switching a wide range of connected loads.
  • Frequency Rating: Rated for 50-60 Hz operation.
  • Digital Scheduling: 24-hour scheduling with 20 programmable ON/OFF set points for flexible daily control.
  • Mounting: Screw-mount installation for secure, straightforward placement.
  • Enclosure: NEMA 3R plastic indoor/outdoor enclosure protects internal components from the elements.
  • Operating Temperature: Rated from -40 to +149 F, supporting use across a wide range of ambient conditions.
  • Application Versatility: Suited for sign, air conditioning, lighting, sump pump, and ventilating fan control.

Certifications & Compliance

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

Technical Specifications

  • Number of Channels: 1
  • ON/OFF Set Points: 20
  • Astronomic: No
  • Brand Name: NSi
  • Holiday Schedules: No

Typical Applications

  • Illuminated Sign Control
  • Air Conditioning Scheduling
  • Commercial Lighting Control
  • Sump Pump Control
  • Ventilating Fan Control
  • Indoor and Outdoor Installations

Why NSi Industries?

NSi Industries builds this 24-hour digital time switch with a durable NEMA 3R plastic enclosure and cULus listing, giving electrical professionals a dependable option for scheduled load control in both indoor and outdoor settings. With a 40A, 120/277 VAC rating and 20 programmable set points, it provides the flexibility needed for sign, HVAC, lighting, and pump control applications while supporting code-compliant, reliable performance.

Manufacturer Resources

Spec Sheet

Product Specs

Mounting Method:
Screw Mount
Action:
SPST
Number of Channels:
1
ON/OFF Set Points:
20
Standards:
cULus
Product Type:
Time Switch
Astronomic:
No
Brand Name:
NSi
Operating Temperature:
-40 to + 149 F
Scheduling:
24 Hour
Holiday Schedules:
No
Voltage Rating:
120/277 VAC
Frequency Rating:
50-60 Hz
Configuration:
NEMA 3R Plastic Indoor-Outdoor
Application:
Sign-Air Conditioning-Lighting-Sump Pumps-Ventilating Fan Control
Listing:
cULus
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Lighting Controls & Sensors

NSi E101B – Frequently Asked Questions

1) Can the NSi E101B time switch be mounted outside on a building exterior?
Yes. The E101B comes in a NEMA 3R plastic enclosure rated for indoor or outdoor use, and it is screw mount, so it fastens directly to a wall, post, or backboard. Operating range is -40 to +149 F, which covers most outdoor sign and parking lot lighting installs in cold climates.
2) Will the NSi E101B work on a 277V lighting circuit?
It will. The E101B is rated 120/277 VAC at 40A, so it drops onto either a 120V single-phase circuit or a 277V leg of a 480/277 three-phase system, which is what most commercial lighting panels run. Frequency rating is 50-60 Hz.
3) How many circuits can one NSi E101B 24-hour time switch control?
One. It is a single-channel SPST device, meaning one set of contacts switching one load on and off. If you need two independently scheduled loads, say exterior signage and interior lighting on separate circuits, you need a two-channel time switch or a second E101B.
4) Does the NSi E101B adjust automatically for sunset, or do I have to reprogram it through the year?
No astronomic function on the E101B. It runs fixed clock times only, so as sunset shifts through the season you will need to adjust the set points manually. For dusk-to-dawn sign or parking lot lighting that should track sunset on its own, specify an astronomic time switch or pair this one with a photocell for the ON command.
5) Can I program different schedules for weekends or holidays on the NSi E101B?
No. The E101B is a 24-hour time switch, so the same daily schedule repeats every day, and it has no holiday schedule capability. If a building needs to skip holidays or run a reduced weekend schedule, step up to a 7-day or annual-calendar time switch instead.
6) Can a 40A time switch like the NSi E101B run an air conditioner or sump pump directly, or does it need a contactor?
The E101B is rated 40A at 120/277 VAC and NSi lists sign, air conditioning, lighting, sump pump, and ventilating fan control among its applications, so loads within that 40A rating can be switched directly through the contacts without a separate contactor. Size against the actual nameplate load of the equipment; anything above 40A needs the time switch driving a contactor coil instead.
7) How many on/off events per day can the NSi E101B 40A time switch handle?
Twenty ON/OFF set points, all within the repeating 24-hour cycle. That is enough to cycle a ventilating fan or sump pump several times a shift, not just a single morning-on and evening-off pair.
8) Is the NSi E101B time switch UL listed for commercial work?
It is cULus Listed, which covers both US and Canadian requirements, and the enclosure carries a NEMA 3R rating for indoor or outdoor installation. That combination is what an inspector looks for on an exterior-mounted lighting control.
9) What part number do I order for the NSi 1-channel 24-hour digital time switch?
Order NSi Industries model E101B. It is a single configuration, 1-channel SPST, 40A at 120/277 VAC in the NEMA 3R plastic enclosure, so there are no finish or voltage options to pick.
How fast can I get the NSi E101B 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 E101B come with a warranty?
Absolutely. The NSi E101B 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 E101B?
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 E101B from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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