SDC 440 Series Large Mushroom ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$239.00
$181.04
SDC SDC 440 Series - Large Mushroom Button Switches SDC-440

SDC 440 Series Large Mushroom Button Emergency Exit Switch with 2-5/8" Diameter Heavy Duty Design

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Model: 442U
$239.00
$181.04
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$239.00
$181.04
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SDC 440 Series Large Mushroom Button Emergency Exit Switch with 2-5/8"; Diameter Heavy Duty Design

Heavy-Duty Emergency Exit and Panic Alarm Switch Solution

The SDC 440 Series large mushroom button switch features a conspicuous 2-5/8"; diameter mushroom button designed for heavy duty industrial applications. This weather-resistant switch assembly incorporates a heavy duty steel bezel around the button to guard against abuse and provides easy activation for emergency egress and panic alarm applications. The large double gang assembly stands out for persons without prior knowledge of egress operation, making it ideal for high-frequency use in commercial environments.

Professional Features & Benefits

  • Large Mushroom Button Design: 2-5/8"; diameter mushroom button provides highly visible and easy-to-activate emergency operation for reliable egress control.
  • Heavy-Duty Construction: Industrial-grade design with heavy duty steel bezel guards against impact and abuse in demanding commercial applications.
  • Weather-Resistant Operation: Water-resistant contacts ensure reliable performance in various environmental conditions and outdoor installations.
  • Flexible Power Options: 12/24VDC operation accommodates various access control system voltage requirements for versatile integration.
  • Multiple Switch Configurations: Available in momentary and alternate action models including DPST configurations for diverse application needs.
  • Professional Installation: Screw terminal wire connections provide secure electrical connections for reliable long-term operation.
  • High-Visibility Design: Red button standard with conspicuous large format ensures immediate recognition in emergency situations.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Electronic: Yes
  • PDF:SDC Full Catalog: https://zensupply.com/content/pdf/lcn/CondensedHardwareBrochure
  • Product Category: Electronic Access Controls
  • Product Group: Electronic Access Controls
  • Product Model: 440
  • Product Subgroup: Sensors, Switches, Relays and Timers
  • Product Type: Push Buttons Switches
  • Product Voltage: 12/24VDC
  • Series: 440 Series
  • Subcategory: Push Buttons Switches

Professional Applications

  • Commercial Building Emergency Exit Systems
  • Industrial Facility Panic Alarm Stations
  • Healthcare Institution Emergency Response
  • Educational Facility Safety Systems
  • Retail Emergency Exit Compliance
  • Warehouse and Distribution Center Safety
  • Government and Municipal Emergency Systems

Why Choose SDC Quality?

SDC 440 Series mushroom button switches deliver professional-grade reliability with heavy duty steel construction and weather-resistant contacts designed for high-frequency use in demanding commercial applications. The industrial-grade design with impact-resistant bezel ensures dependable emergency activation when reliability is critical. Engineered for commercial environments where immediate emergency response and long-term durability are essential.

Manufacturer Resources

SDC Full Catalog

Product Specs

Series:
440 Series
Subcategory:
Push Buttons Switches
Product Group:
Electronic Access Controls
Product Subgroup:
Sensors, Switches, Relays and Timers
Product Type:
Push Buttons Switches
Commercial/Residential:
Commercial
Electronic:
Yes
Product Model:
440
Product Voltage:
12/24VDC
Product Category:
Electronic Access Controls
Department:
Door Hardware

SDC 442U – Frequently Asked Questions

1) Will the SDC 440 mushroom button fit a single gang box?
Only the 446. It is the single gang momentary (MO), DPST model. The 442 is a double gang momentary and the 440 Series assembly is otherwise described as a large double gang unit, so if you are working with an existing single gang ring you need the 446 or a box change.
2) How big is the button on the SDC 440 Series, and why does that matter for emergency egress?
The mushroom button measures 2-5/8 inches in diameter. That size is the point of the product: it is meant to be recognized and hit by someone who has never used the door before, which is what you want at a panic alarm or emergency egress station. For comparison, the Camden CM-5000 and CM-6000 mushroom buttons are 2-3/8 inch and the Dortronics 5210 exit release button is 1-9/16 inch.
3) What is a comparable mushroom exit button if the SDC 440 is too large for the opening?
The SDC 440 Series uses a 2-5/8 inch diameter mushroom button on a large double gang assembly. Where a smaller button and a single gang plate fit the space better, the Camden CM-5000 Series is a 2-3/8 inch mushroom pushbutton on an aluminum faceplate, and the Dortronics 5210 Series 5211-MP23 uses a 1-9/16 inch diameter red mushroom button mounted on a single gang plate with "Push to Exit"/"Emergency Release" text. The SDC 440 Series does include a single gang momentary model, the 446, if you want the SDC switch in a narrower box.
4) Does the SDC 440 Series exit switch run on 12VDC or 24VDC?
Both. The 440 Series is rated 12/24VDC, so it drops into an access control or mag lock circuit on either supply without a different part number.
5) Can I get a green button instead of red on the SDC 440 switch?
Yes. Red is the standard button color, and the G option supplies a green button instead. Green is the usual choice when the station is a routine push-to-exit rather than an emergency release, so the color does not read as a panic device.
6) Can the SDC 440 push button show whether the door is locked or unlocked?
Yes, if you order it with an LED indicator. The options are L1G (one green LED), L1R (one red LED), L2 (one green and one red), and LT (a single tri-color LED). L2 or LT are the ones to specify when you want secure and unsecure states shown from one station. Order the None option if you do not want an indicator.
7) Can I mount an SDC 440 mushroom button outdoors or in a wash-down area?
The 440 Series uses water-resistant contacts and the assembly is described as weather resistant, so it is built for outdoor and damp locations. The heavy duty steel bezel around the button is there to take impact and abuse, which is the other half of what an exterior or loading dock station needs.
8) How does the SDC 440 wire into an access control panel?
Through screw terminals on the switch. Every model is DPST, so you get two independently switched poles: one set commonly breaks the mag lock or strike power and the second reports the push to the panel or shunts an alarm. If you need two full DPST switch blocks rather than one, that is the 444.
9) Will a Camden CM-AF500 work in place of an SDC 440 with an LED option?
No. The Camden CM-AF500 is a single gang LED "Occupied When Lit" indicator in the CX-WC Series - it is an indicator only, with no mushroom button to actuate. The SDC 440 Series is a switch first; its L1G, L1R, L2 and LT device options add one green, one red, one green and one red, or one tri-color LED to the switch assembly. Use the CM-AF500 as a remote status light, not as a replacement for the exit switch itself.
10) Which mushroom exit button matches architectural door hardware finishes rather than plain aluminum?
The SDC 440 Series is offered in 605 bright brass, 613 oil rubbed bronze, 629 bright stainless and 630 satin stainless steel, so it can be specified to the same BHMA finish as the rest of the opening. The Camden CM-5000 Series 2-3/8 inch mushroom pushbutton is described with an aluminum faceplate. For a lobby or guest-facing opening where the plate is visible, the 440 finish range is the one that follows a hardware schedule.
11) For a labeled push to exit station, should I use the SDC 440 or the Dortronics 5211-MP23?
The Dortronics 5211-MP23 comes with "Push to Exit"/"Emergency Release" text on a single gang plate, so the instruction is printed at the device. The SDC 440 Series relies instead on a conspicuous 2-5/8 inch red mushroom button in a heavy duty steel bezel, sized so that persons without prior knowledge of egress operation recognize it. Choose the Dortronics where wording is required by the authority having jurisdiction, and the SDC 440 where a larger, abuse-resistant button is the priority.
12) Which mushroom button holds up best in an exterior or wash-down location?
The SDC 440 Series is built for that duty: water-resistant contacts, a heavy duty steel bezel guarding the button against abuse, and 12/24VDC operation to suit the access control power in use. Among the mushroom alternatives, the Camden CM-5000 Series and the Dortronics 5211-MP23 are both faceplate-mounted single gang mushroom stations sized smaller at 2-3/8 inch and 1-9/16 inch respectively. For loading docks, garages and industrial corridors where the station takes impact, the 440 is the heavier assembly.
13) What finishes does the SDC 440 mushroom button plate come in for matching other hardware in the building?
Four: 605 bright brass, 613 oil rubbed bronze, 629 bright stainless, and 630 satin stainless steel. For most commercial openings 630 satin stainless is the one that matches standard lever and exit device trim; 605 and 613 are there when the station sits next to decorative brass or bronze hardware.
14) Is the SDC 440 Series suitable for a high traffic commercial door, or is it a residential switch?
It is a commercial-rated device. The 440 Series is built for high-frequency use in industrial and commercial settings, with a steel bezel guarding the button against abuse. Typical placements are emergency exit stations in warehouses and distribution centers, panic alarm stations in industrial plants, healthcare and school egress, and municipal buildings.
How fast can I get the SDC 442U 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 442U come with a warranty?
Absolutely. The SDC 442U 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 442U?
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 442U from ZenSupply?
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