NSi Industries Electric Door S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$63.11
NSi Industries Electric Door Switch, 125/250V NC

NSi Industries Electric Door Switch, 125/250V NC

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Model: TA502

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

$63.11
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NSi Industries Electric Door Switch, 125/250V NC

The NSi Industries Electric Door Switch is a normally-closed (NC) door-interlock switch rated 125/250V, built for reliable make/break switching whenever a door, panel, or access cover is opened or closed. It features a durable screw-mount design for secure installation into enclosures, cabinets, and equipment panels. As an NSi Industries door switch, it delivers dependable performance for interlock and safety-circuit applications where consistent contact operation is essential.

Key Features

  • Electrical Rating: Rated 125/250V for use in standard door-interlock and access-control circuits.
  • Normally Closed (NC) Contact: NC switching action ensures the circuit is broken when the door or panel is opened, supporting fail-safe interlock designs.
  • Screw Mount Installation: Screw-mount hardware allows secure, stable attachment to enclosures, cabinets, and equipment frames.
  • Purpose-Built Door Switch: Designed specifically as an electric door switch for applications requiring circuit interruption tied to door or panel position.
  • NSi Industries Quality: Manufactured by NSi Industries for consistent electrical switching performance in professional installations.

Technical Specifications

  • Brand Name: NSi
  • Mounting: Screw Mount
  • Application: Door Switch
  • Type: Electric Door Switches
  • Voltage Rating: 125/250V
  • Contact Type: Normally Closed (NC)

Typical Applications

  • Door and Access-Panel Interlock Circuits
  • Enclosure and Cabinet Safety Switching
  • Commercial and Industrial Equipment Panels
  • Control Panel Door Monitoring
  • Renovation and New Construction Electrical Work

Why NSi Industries?

NSi Industries builds electrical switching components engineered for dependable, code-compliant performance in professional installations. With its 125/250V NC rating and secure screw-mount design, this door switch is built to deliver consistent, reliable operation in door-interlock and safety-switching applications where predictable performance matters.

Manufacturer Resources

Spec Sheet

Product Specs

Mounting Method:
Screw Mount
Brand Name:
NSi
Application:
Door Switch
Product Type:
Electric Door Switches
Connection Type:
Screw Mount
Department:
Electrical
Product Group:
Wiring Devices
Product Subgroup:
Switches

NSi TA502 – Frequently Asked Questions

1) Is the NSi TA502 door switch normally open or normally closed?
The TA502 is a normally closed (NC) switch. With the door or panel shut, the contact is made; open the door and the circuit breaks. That is the behavior you want for fail-safe interlocks, where opening an enclosure kills the circuit rather than energizing it. If your control scheme needs the circuit to close on door opening, this is the wrong contact arrangement.
2) What voltage can the NSi TA502 electric door switch handle?
It carries a 125/250V rating, which covers standard 120V and 240V control and lighting circuits in commercial and industrial panels. Treat 250V as the ceiling: do not put it on anything above that.
3) Can I use the NSi TA502 as a door-position switch to turn on a light inside a control cabinet?
Not directly as wired. The TA502 breaks the circuit when the door opens, so a lamp wired straight through it would go out on opening, not come on. For cabinet or closet lighting that switches on with the door, you want a normally open door switch. The NC action here is intended for interlock and safety circuits that must drop out when a panel is opened.
4) How does the NSi TA502 door switch mount into an enclosure or cabinet?
It is a screw-mount switch, fastened directly to the enclosure, cabinet, or equipment frame. There is no snap-in or clip retention, so you need a solid mounting surface and access to drive the screws, and you set the switch position so the door or access cover makes contact when it closes.
5) Is the NSi TA502 a door-position switch for a building entry door or an equipment panel switch?
It is built for equipment: enclosure doors, cabinet doors, control panel doors, and access covers. Typical uses are interlock circuits, enclosure safety switching, and control panel door monitoring. For monitoring a building entry door into an alarm or access control system you would use a door contact intended for that, not a line-voltage panel interlock switch.
6) What part number do I order for the NSi door interlock switch, and does it come in other versions?
Order NSi TA502. That is the only configuration, so there is no finish, voltage, or contact-arrangement choice to specify on the order, and no handing to call out.
7) Where can I get the full electrical specs for the NSi TA502 door switch for a submittal?
NSi publishes a spec sheet for the TA502, hosted at https://media.distributordatasolutions.com/nsi/2020q1/6e21c394baa870303f9737babd482e3705a3bdab.pdf. That is the document to attach for submittals when an engineer wants the manufacturer data on the 125/250V NC switch.
How fast can I get the NSi TA502 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 TA502 come with a warranty?
Absolutely. The NSi TA502 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 TA502?
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 TA502 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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