NSi A502HW Spring Wound In-Wal...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$67.81
NSi A502HW Spring Wound In-Wall Timer Switch, SPDT, White

NSi A502HW Spring Wound In-Wall Timer Switch, SPDT, White

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Model: A512HW

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

$67.81
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NSi A502HW Spring Wound In-Wall Timer Switch, SPDT, White

The NSi Industries Spring Wound In-Wall Timer Switch is a manual, twist-dial time switch built to install directly into a standard single gang wall plate, making it a simple retrofit for existing switch boxes with no extra wiring space required. This family is available in sizes ranging from 2" to 12", letting electricians and property owners select the timer footprint that best fits the application while sharing the same core electrical performance across the line. Featuring SPDT (single-pole double-throw) switching action and a broad contact rating of 125-250-277 VAC, this White-finish timer is designed to control whole-house fans, indoor and outdoor lighting, bathroom exhaust fans, and self-storage facility lighting from a single twist-dial interface. Backed by cULus listing and rated for 50-60 Hz electrical systems, it delivers dependable, code-recognized timing control for both residential and light commercial applications, with an operating range of 32-122 F for reliable performance across typical indoor conditions.

Key Features

  • Size Range: Offered from 2" to 12" to suit different in-wall timer configurations while retaining the same switching and rating specifications.
  • Single Gang Wall Plate Mounting: Fits a standard single gang wall plate enclosure for straightforward installation into existing switch locations.
  • Spring Wound Operation: Manual spring-wound in-wall time switch provides timed run time from a simple twist, with no batteries or standby power required for the timing function.
  • SPDT Switching Action: Single-pole double-throw contact action allows flexible control of connected fan and lighting loads.
  • Wide Contact Rating: Rated 125-250-277 VAC, supporting a broad range of residential and commercial voltage circuits from a single device.
  • Frequency Rating: Rated for 50-60 Hz electrical systems, suitable for standard North American power supplies.
  • Operating Temperature Range: Performs reliably across an operating temperature range of 32-122 F.
  • White Finish: Clean White finish coordinates with standard wall plates and decor in residential and commercial spaces.

Certifications & Compliance

  • cULus Listed

Technical Specifications

  • Brand Name: NSi
  • Product Type: Spring Wound In-Wall Time Switch
  • Frequency: 50-60 hertz
  • Contact Rating: 125-250-277 VAC
  • Switch Configuration: SPDT
  • Color: White
  • Operating Temperature Range: 32-122 F

Typical Applications

  • Whole-House Fan Timing Control
  • Indoor and Outdoor Lighting Control
  • Bathroom Exhaust Fan Timing
  • Self-Storage Facility Lighting Control
  • Residential and Light Commercial Wiring Device Retrofits

Why NSi?

NSi Industries engineers this in-wall timer switch family to a cULus listed standard, giving electricians, contractors, and property owners a code-recognized, spring-wound timing solution that needs no external power source to operate its timing mechanism. With a wide 125-250-277 VAC contact rating, SPDT switching action, and a 32-122 F operating range shared across the 2" to 12" size offerings, it delivers flexible, dependable control for lighting and fan circuits in both residential and light commercial settings, all within a compact single gang wall plate footprint.

Manufacturer Resources

Spec Sheet

Product Specs

Mounting Method:
Single Gang Wall Plate
Brand Name:
NSi
Configuration:
SPDT
Application:
Whole House Fans-Indoor-Outdoor Lighting-Bathroom Fans-Self Storage Control
Action:
SPDT
Amperage Rating:
125-250-277 VAC
Standards:
cULus
Product Type:
Time Switch
Operating Temperature:
32-122 F
Frequency Rating:
50-60 Hz
Department:
Electrical
Product Group:
Wiring Devices
Frequency:
50-60 hertz
Listing:
cULus
Product Finish:
White
Product Color:
White
Voltage Rating:
125-250-277 VAC
Product Size:
2" - 12"
Product Subgroup:
Lighting Controls & Sensors

NSi A512HW – Frequently Asked Questions

1) Will the NSi A502HW spring wound timer fit in an existing single gang switch box?
Yes. The NSi 2-hour spring wound time switch mounts behind a standard single gang wall plate, so it drops into an existing switch location without extra box depth for a transformer or battery pack. The timing mechanism is purely mechanical, so there is no neutral needed to run a clock.
2) Can this NSi in-wall timer be used on a 277V commercial lighting circuit?
Yes. The contact rating covers 125-250-277 VAC, so the same device works on 120V residential circuits and on 277V commercial lighting branch circuits. It is rated for 50-60 Hz systems.
3) How long does the NSi A502HW run before it shuts off?
It is a 2-hour mechanical timer. One twist of the dial sets any interval up to two hours, and the spring unwinds back to off and kills the load, so nothing is left running. There is no hold-on position described for this model.
4) Can I put this timer in an unheated garage, storage building, or outdoor-lit area?
The device operates from 32 to 122 F. That rules out unheated spaces that go below freezing, so for a self-storage corridor or garage in a cold climate, keep the timer itself inside the conditioned envelope and let it switch the exterior lighting circuit. Controlling outdoor lighting is a listed application, but the switch body has to stay above freezing.
5) What is the difference between the NSi A502HW and the A512HW?
Both are the same White spring wound in-wall time switch family; they differ by the time range, ordered as the 2 option (A502HW) and the 12 option (A512HW). Pick the 2 for bath fans and short-cycle lighting, the 12 where a longer run like a whole-house fan or storage area lighting is wanted.
6) Do I need a neutral wire to install this NSi timer?
No. The timing is spring wound and mechanical, so the switch needs no standby power or battery to keep time. That makes it a workable swap in older boxes that only have a switch leg, unlike electronic countdown timers.
7) What does SPDT switching give me on a spring wound bath fan timer?
Single-pole double-throw action means the timer has a common plus two contacts, so it can switch a load on for the timed period and transfer to a second circuit rather than only breaking one leg. On a bath fan or whole-house fan that gives you flexibility in how the fan and light circuits are wired.
8) Is the NSi spring wound timer switch listed for commercial jobs where an inspector will look at it?
It carries a cULus listing, which covers both the US and Canadian requirements for the device. That is the only listing stated for this timer.
9) Will a standard wall plate match this timer, and what color is it?
The timer is White and sits behind a standard single gang plate, so it coordinates with the rest of a White device run in an apartment or office. Property managers standardizing a building can use the same plate stock already on the toggle switches.
How fast can I get the NSi A512HW 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 A512HW come with a warranty?
Absolutely. The NSi A512HW 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 A512HW?
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 A512HW from ZenSupply?
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