NSi EWZ Astronomic 7-Day Digit...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$636.63
NSi EWZ Astronomic 7-Day Digital Time Switch, 30A 120-277V

NSi EWZ Astronomic 7-Day Digital Time Switch, 30A 120-277V

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Model: EWZ120

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

$636.63
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NSi EWZ Astronomic 7-Day Digital Time Switch, 30A 120-277V

The NSi Astronomic 7-Day Digital Time Switch is an SPDT control device rated 30A at 120-277V, built for automated switching of outdoor signs, security lighting, and HVAC equipment. This time switch platform is available in 1-Channel and 2-Channel configurations to match single or dual-load control applications, and every configuration shares the same astronomic programming, 30A 120-277V rating, and rugged enclosure. Housed in a NEMA 3R plastic indoor/outdoor enclosure with a locking hasp, the switch automatically adjusts ON/OFF set points to local sunrise and sunset times across a full 7-day schedule, and carries cULus listing for code-compliant commercial and industrial use.

Key Features

  • Astronomic 7-Day Scheduling: Supports up to 20 ON/OFF set points across a 7-day program, automatically tracking sunrise and sunset for precise, hands-free control.
  • 1-Channel or 2-Channel SPDT Action: Choose the single-channel or dual-channel SPDT configuration to suit outdoor signs, security lighting, and HVAC control applications.
  • 30A 120-277V Rating: High-capacity 30A switching at 120-277V supports demanding commercial lighting and HVAC control circuits, shared across both channel configurations.
  • Durable Weatherproof Enclosure: NEMA 3R plastic indoor/outdoor enclosure with a locking hasp protects the switch mechanism and secures the unit against tampering.
  • Wide Operating Temperature Range: Rated for reliable operation from -40 to +149 F, suitable for exposed outdoor installations.
  • 50-60 Hz Frequency Rating: Compatible with standard 50-60 Hz power systems.
  • Screw Mount Installation: Simple screw-mount design for straightforward panel or wall installation.

Certifications & Compliance

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

Technical Specifications

  • ON/OFF Set Points: 20
  • Scheduling: 7 Day
  • Holiday Schedules: No
  • Brand Name: NSi
  • Configuration: NEMA 3R Plastic Indoor-Outdoor With Locking Hasp
  • Application: Outdoor Signs-Lighting Security-HVAC Control
  • Channel Options: 1-Channel or 2-Channel
  • Product Type: 7 Day Astronomic Time Switch - 1 Or 2 Channel
  • Astronomic: Yes
  • Operating Temperature: -40 to + 149 F
  • Frequency: 50-60 hertz

Typical Applications

  • Outdoor Sign Lighting Control
  • Security Lighting Automation
  • HVAC Equipment Scheduling
  • Commercial and Industrial Lighting Control
  • Outdoor and Wet-Location Installations

Why NSi?

NSi builds this astronomic time switch platform around a rugged NEMA 3R plastic enclosure with a locking hasp and a cULus listing, giving electrical professionals a dependable, code-compliant option for automated outdoor and commercial lighting control in either 1-Channel or 2-Channel form. With a 30A 120-277V SPDT rating and a wide -40 to +149 F operating range, it delivers consistent, reliable scheduling performance in demanding indoor and outdoor environments.

Manufacturer Resources

Spec Sheet

Product Specs

Mounting Method:
Screw Mount
ON/OFF Set Points:
20
Scheduling:
7 Day
Holiday Schedules:
No
Brand Name:
NSi
Configuration:
NEMA 3R Plastic Indoor-Outdoor With Locking Hasp
Application:
Outdoor Signs-Lighting Security-HVAC Control
Action:
SPDT
Number of Channels:
1
Standards:
NEMA 3R
Product Type:
Time Switch
Astronomic:
Yes
Operating Temperature:
-40 to + 149 F
Frequency Rating:
50-60 Hz
Department:
Electrical
Product Group:
Wiring Devices
Frequency:
50-60 hertz
Product Material:
Plastic
Listing:
cULus
Voltage Rating:
120-277V
Amperage Rating:
30A
Product Subgroup:
Lighting Controls & Sensors

NSi EWZ120 – Frequently Asked Questions

1) What is the difference between the NSi EWZ120 and EWZ201C astronomic time switches?
Channel count. The EWZ120 is the 1-channel version, controlling a single SPDT load circuit. The EWZ201C is the 2-channel version, so you can run two independently scheduled circuits from one enclosure, for example sign lighting on one and parking lot lighting on the other. Everything else about the family is the same: astronomic 7-day scheduling, NEMA 3R plastic indoor/outdoor enclosure with a locking hasp, and cULus listing.
2) Can this NSi time switch be mounted outdoors on a pole or exterior wall?
Yes. The enclosure is NEMA 3R plastic rated for indoor or outdoor use and includes a locking hasp so the unit can be padlocked against tampering. It mounts with screws to a wall or panel, and the switch is rated to operate from -40 to +149 F, so cold-climate exterior installs are within spec. NEMA 3R is a rain and sleet rating, not a washdown or submersion rating, so avoid locations that see direct pressure spray or standing water.
3) Will this NSi astronomic time switch work on a 277V lighting circuit?
Yes. The switch is rated 30A at 120-277V, so it covers 120V, 208V, 240V and 277V commercial lighting circuits, and it works on 50 or 60 Hz systems. That 277V capability is the one contractors care about on commercial ballast and LED driver circuits fed from a 480/277V panel.
4) Does an astronomic time switch need a photocell to follow sunrise and sunset?
No. An astronomic switch calculates local sunrise and sunset from the date and location you program in, and shifts the ON/OFF points automatically through the year, so no photocell, no lens to keep clean, and no false switching from headlights or snow cover. A plain 7-day switch fires at fixed clock times and has to be reset seasonally; if you want dusk-to-dawn behavior without a sensor, astronomic is the right type.
5) I need two separate lighting schedules from one location. Do I have to buy two time switches?
No, order the 2-channel EWZ201C instead of the 1-channel EWZ120. One enclosure, two independently programmed circuits, which saves a second NEMA 3R box, a second feed and a second set of screw-mount penetrations on the wall. Both channels share the same astronomic 7-day program engine and the same 20 ON/OFF set point capacity.
6) How many on/off events can I program per week on the NSi EWZ time switch?
Up to 20 ON/OFF set points across the 7-day program. That is enough to run a different schedule each day of the week with a couple of events per day, or to split a day into multiple on/off blocks. What it will not do is holiday or date-exception scheduling, so if your facility needs lighting suppressed on specific calendar dates, this is not the control for that job.
7) Can I use this time switch to control an HVAC unit or just lighting?
Both. NSi lists the application as outdoor signs, security lighting and HVAC control. The SPDT contact gives you a normally open and a normally closed set, so it can either switch the load directly within its 30A 120-277V rating or drive a contactor coil for larger motor loads. For any equipment drawing more than the contact rating, wire it through a definite purpose contactor and let the time switch handle the coil.
8) Is the NSi EWZ time switch listed for commercial code-compliant installation?
It carries a cULus listing, which covers both US and Canadian requirements, so it can be specified on commercial and industrial work on either side of the border. The enclosure itself is NEMA 3R rated for indoor or outdoor mounting.
9) Where can I get the wiring diagram and terminal details for the NSi EWZ astronomic time switch?
NSi publishes a spec sheet for the EWZ series that covers the electrical and installation detail, available at https://media.distributordatasolutions.com/nsi/2020q1/d1b1b43e855750423a193e4f4e0f5ab7de729506.pdf. Useful before you rough in, since the unit is screw mounted and you will want conduit entry located before the box goes on the wall.
How fast can I get the NSi EWZ120 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 EWZ120 come with a warranty?
Absolutely. The NSi EWZ120 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 EWZ120?
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
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