SDC 420 Series Illuminated Pus...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$88.00
$56.77
SDC SDC 420 Series - Illuminated Push Button Switches SDC-420

SDC 420 Series Illuminated Push Button Exit Switches with 2" Buttons and Code Compliance

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Model: 422U
$88.00
$56.77
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$88.00
$56.77
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SDC 420 Series Illuminated Push Button Exit Switches with 2"; Buttons and Code Compliance

Professional Access Control Exit Switch Solution

The SDC 420 Series illuminated push button switches feature 2"; square illuminated buttons for easy activation and visual identification in access-controlled egress applications. These switches operate on 12/24VDC auto-sensing dual voltage and comply with NFPA requirements including IBC 1008.1.3.4, IFC 1008.1.3.4, NFPA 101 Life Safety Code 7.2.1.6.2, and BOCA National Building Code 1017.4.5. The high impact resistant material construction with stainless steel faceplate provides durability for demanding commercial applications.

Professional Features & Benefits

  • Large 2"; Illuminated Buttons: Two-inch square buttons provide easy activation and high visibility for ADA compliance and emergency egress applications.
  • Code Compliance Certification: Meets IBC 1008.1.3.4, IFC 1008.1.3.4, NFPA 101 Life Safety Code 7.2.1.6.2, NFPA 1.15.5.3.2, BOCA National Building Code 1017.4.5, and SBCCI Standard Building Code 1012.7 requirements.
  • Flexible Power Options: Auto-sensing dual voltage 12/24VDC operation eliminates the need for voltage-specific models and simplifies installation.
  • Heavy-Duty Construction: High impact resistant material with stainless steel faceplate stands up to abuse in high-traffic commercial environments.
  • Multiple Operating Modes: Available in momentary (MO), electronic timer adjustable and fixed, pneumatic timer adjustable, DPDT, and alternate action (AA) on/off configurations.
  • Complete Signage Package: Includes ";PUSH TO EXIT"; sign that complies with NFPA requirements plus green and red lens options for various applications.
  • ADA Application Design: Model 422A specifically designed for access and egress ADA applications with appropriate button size and activation force.
  • Motion Sensor Integration: Model 423MN exit switches work with MD-31D motion sensors to comply with manual releasing device and sensor requirements for access-controlled egress doors.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Electronic: Yes
  • Product Category: Electronic Access Controls
  • Product Group: Electronic Access Controls
  • Product Model: 422, 423, 423M, 423P, 424, 425
  • Product Subgroup: Sensors, Switches, Relays and Timers
  • Product Type: Push Buttons Switches
  • Product Voltage: 12/24VDC
  • Series: 420 Series
  • Subcategory: Push Buttons Switches

Professional Applications

  • Commercial Building Security Systems
  • Healthcare Facility Access Control
  • Educational Institution Safety Systems
  • Retail Loss Prevention
  • Industrial Facility Monitoring
  • Emergency Exit Compliance
  • ADA-Compliant Egress Systems

Why Choose SDC Quality?

SDC 420 Series push button switches deliver professional-grade reliability with high impact resistant materials and stainless steel construction designed for demanding commercial applications. Multiple code compliance certifications including IBC, IFC, NFPA 101, and BOCA ensure proper regulatory adherence. Engineered for demanding commercial applications where dependable egress control and ADA compliance are essential.

Manufacturer Resources

SDC Full Catalog

Product Specs

Subcategory:
Push Buttons Switches
Series:
420 Series
Product Group:
Electronic Access Controls
Product Subgroup:
Sensors, Switches, Relays and Timers
Product Type:
Push Buttons Switches
Commercial/Residential:
Commercial
Electronic:
Yes
Product Model:
422, 423, 423M, 423P, 424, 425
Product Voltage:
12/24VDC
Product Category:
Electronic Access Controls
Department:
Door Hardware

SDC 422U – Frequently Asked Questions

1) What is the difference between the SDC 422, 423, 424 and 425 exit switches?
They differ by contact form and how long the door stays released. The 422 is momentary, SPDT, so the door releases only while the button is held. The 424 is the same momentary action but DPDT, giving you a second set of contacts for an alarm shunt or a monitoring input. The 423 adds an electronic timer adjustable from 1 to 60 seconds, DPDT, and the 423M is the same timer fixed at 30 seconds. The 423P uses a pneumatic timer adjustable 1 to 45 seconds, DPST. The 425 is alternate action on/off, DPDT, so one press releases and the next press restores, which is what you want for a door you need to hold unlocked. Pick the timed models when the buyer needs enough delay to get through the opening without a hold-open.
2) Does the SDC 420 Series exit button meet code for an access-controlled egress door?
The 420 Series switches comply with IBC 1008.1.3.4, IFC 1008.1.3.4, NFPA 101 Life Safety Code 7.2.1.6.2, NFPA 1.15.5.3.2, BOCA National Building Code 1017.4.5, and SBCCI Standard Building Code 1012.7. They ship with a PUSH TO EXIT sign that meets the NFPA signage requirement, so the manual release device and its labeling are both handled by the one part.
3) Which SDC 420 Series model do I use for an ADA egress application?
The 422A is the model SDC calls out for access and egress ADA applications, sized and set up for the activation the application needs. All the 420 Series switches use a 2 inch square illuminated button, which is the part that makes them easy to hit and easy to see, but 422A is the one specified for ADA work. There is also a 423A if you want the adjustable 1 to 60 second electronic timer alongside it.
4) I need an exit switch that ties into a motion sensor for a delayed egress door. Which SDC model?
The 423MN. SDC pairs that model with the MD-31D motion sensor so the opening satisfies both the manual releasing device and the sensor requirement for access-controlled egress doors. If you already have a compliant request-to-exit sensor on the door, a plain 422 or 423 covers the manual release side on its own.
5) My exit button only unlocks the door while I hold it. What do I order instead so the door stays released long enough to walk through?
Move off the momentary models and onto a timed one. The 422 and 424 are momentary, so release lasts only as long as the button is pressed. The 423 gives you an electronic timer adjustable from 1 to 60 seconds, the 423M is fixed at 30 seconds if you would rather nobody could change it, and the 423P is a pneumatic timer adjustable 1 to 45 seconds. If what you actually want is a door that stays unlocked until someone presses again, that is the 425 alternate action on/off.
6) The Camden CM-5000 mushroom button releases the door instantly. What if I need the door to stay unlocked for a set time?
The Camden CM-5000 Series is a 2-3/8 inch mushroom pushbutton on an aluminum faceplate. For a timed unlock, the SDC 420 Series carries three timer models: the 423 electronic timer adjustable from 1 to 60 seconds with DPDT contacts, the 423M electronic timer fixed at 30 seconds DPDT, and the 423P pneumatic timer adjustable from 1 to 45 seconds with DPST contacts. Use the 423 where the dwell has to be tuned on site, the 423M where a fixed 30 second release is wanted so nobody can change it, and the 423P where a pneumatic timer is preferred over an electronic one.
7) Can I get an SDC push to exit button with an LED status light, and what colors?
Yes, and there are four indicator choices plus a no-indicator version. You can order one green LED (L1G), one red LED (L1R), one green and one red together (L2), or a single tri-color LED (LT). The L2 and LT options are the ones to pick when you want the plate to show both locked and unlocked states from the same device rather than just a single confirmation light.
8) What finishes do SDC 420 Series exit switch plates come in to match the rest of my door hardware?
Seven: 605 bright brass, 606 dull brass, 613 oil rubbed bronze, 625 bright chrome, 626 dull chrome, 629 bright stainless, and 630 satin stainless steel. For most commercial openings 630 satin stainless is the one that matches the lever and push plate hardware already on the door. The faceplate itself is stainless steel over high impact resistant material, which is what holds up in a corridor that takes cart traffic.
9) Do I need DPDT contacts on my exit button, or is SPDT enough?
SPDT is enough when the button does one job: break the circuit to the mag lock or strike. That is the 422. Go DPDT when you need a second independent set of contacts, typically to shunt a door alarm, signal the access panel, or drive an annunciator at the same instant the lock releases. On the 420 Series the DPDT models are the 424 (momentary), 423 and 423M (electronic timer), and 425 (alternate action). The 423P is DPST, so it makes and breaks two circuits but does not give you a transfer contact.
10) How is the SDC 420 Series different from a Camden or Dortronics mushroom exit button?
Different button style and a different reason to reach for each. The 420 Series uses a 2 inch square illuminated button on a stainless steel faceplate, so it lights up and reads as an exit device from across a lobby. The Camden CM-5000 Series is a 2-3/8 inch mushroom pushbutton on an aluminum faceplate, and the Dortronics 5210 uses a 1-9/16 inch diameter red mushroom button pre-labeled Push to Exit / Emergency Release on a single gang plate. Mushroom buttons take a palm or an elbow and suit emergency release positions; the illuminated square button suits everyday egress traffic where the light confirms the door released. If you specifically need a button that stays latched down until reset, the Camden CM-6000 is a red locking mushroom switch.
11) Do the SDC exit buttons come with the Push to Exit sign, or do I order that separately?
The sign is included. Each 420 Series switch ships with a PUSH TO EXIT sign that meets the NFPA requirement, along with green and red lens options so you can set the button color to suit the application. Nothing extra to order for the labeling on an access-controlled egress opening.
12) I want one exit button that stays on until someone presses it again, for a door I unlock during business hours. Does SDC make that?
The 425. It is alternate action on/off with DPDT contacts, so one press releases the door and it stays released until the next press restores it. That is the right choice for a lobby door someone unlocks at open and locks at close by hand. Every other model in the 420 Series either releases momentarily or times back out on its own, so none of them will hold a door unlocked all day.
13) Can a Camden CM-AF500 indicator be used in place of an SDC 420 exit switch?
No, they do different jobs. The Camden CM-AF500 is a single gang LED "Occupied When Lit" indicator in the CX-WC Series, so it annunciates a state rather than switching anything. The SDC 420 Series is a push button exit switch that carries the release contacts, with models from momentary SPDT through DPDT and alternate action. If the reason you were looking at an indicator is status annunciation at the door, the 420 Series can carry it on the switch itself through the LED device options: one green, one red, one green and one red, or one tri-color.
14) I need the exit button to match the brass and bronze hardware on the rest of the doors. What are my choices?
The Camden CM-5000 Series mushroom pushbutton comes on an aluminum faceplate. The SDC 420 Series is offered in seven architectural finishes: 605 bright brass, 606 dull brass, 613 oil rubbed bronze, 625 bright chrome, 626 dull chrome, 629 bright stainless, and 630 satin stainless steel. If the finish has to follow the lever and hinge finish through a lobby or corridor, the 420 Series gives you brass and bronze options to specify against; if the plate is going into a back of house or industrial location where finish does not need to match, the aluminum faceplate button is the simpler specification.
15) For an ADA egress application, is a 2-3/8 inch mushroom button or a 2 inch square button the right actuator?
Both are large-format actuators meant to be struck rather than pinched. The Camden CM-5000 and CM-6000 use a 2-3/8 inch mushroom head, and the Dortronics 5211-MP23 a 1-9/16 inch mushroom head on a single gang plate. The SDC 420 Series uses a 2 inch square illuminated button, and within that series the 422A is the model specifically built for access and egress ADA applications with the appropriate button size and activation force. The SDC button is also illuminated, which matters where the release has to be identified in a darkened corridor.
16) Is the SDC 420 Series exit switch tough enough for a school corridor or a hospital hallway?
It is built for that kind of traffic. The body is high impact resistant material with a stainless steel faceplate, and SDC lists the series for commercial use, including healthcare facility access control and educational institution safety systems. In a corridor that takes carts and gurneys, the stainless plate is the part doing the work, and ordering 630 satin stainless keeps scuffing from showing the way a brass finish would.
How fast can I get the SDC 422U 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 SDC 422U come with a warranty?
Absolutely. The SDC 422U 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 SDC 422U?
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 SDC 422U 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.

Product Reviews

  • 5
    Door switch

    Posted by R. Gonzales on Sep 10th 2026

    Great product at a fair price. Ordering was easy and shipping was very prompt.

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