Can you believe we are reaching Q4 already? To prepare for Knox's annual plant shut down for maintance (Mid December),


Any orders placed after this date will likely be unable to be fulfilled until 2023.

If you have further questions please email or give us a call at 720-710-5669.

Thanks, The Sentry Tech Team

Knox Gate & Key Switches™- Englewood FD

Calculated at Checkout
  • Eliminate the barriers that delay emergency response. Knox Gate & Key Switches and Padlocks facilitate rapid access through perimeters for safer, faster emergency response.
  • 3501- Knox Gate & Key Switch
  • 3502- Knox Gate & Key Switch on Mounting Plate
  • 3527- Knox Gate & Key Switch Dual Lock
MSRP: $217.00
— You save $58.00
Frequently bought together:


  • Benefits
  • Options
  • Specs
  • Diagram
  • Need Help?
  • FAQ


Eliminate perimeter barriers that delay emergency response with the Knox Gate & Key Switch. Override electronic gates and lower voltage equipment to allow emergency access into communities, apartment complexes, parking garages, pedestrian gates, industrial receiving areas and much more.


  • One Position, two position or momentary switch
  • Works with electronic gates and roll up doors
  • Face place and lock cover ensure weather resistant operation
  • Dual locks enable shared access with other agencies
  • Lock cover protects against extreme weather conditions


  • Gain rapid access through electronic gates without forced entry
  • Override electronic gates, motorized doors, electrical switches
  • Can share access with multiple agencies
  • Utilizes Knox Master Key solution

Right click HERE to download spec sheet

Right click HERE for more information on Jurisdictional Rules



1. Lock & Mounting Types:

  • Dust Cover
  • Single Lock on Plate
  • Dual Lock on Plate

2. Switch Type:

  • Toggle (2-Postion)
  • Hold to Activate (Momentary)

3. Signals:

  • One Signal per Lock (SPDT)
  • Two Simultaneous Signals per Lock (DPDT)
  • Fire, EMS, security or law enforcement identification labels



To insure procurement and delivery of the Knox Gate & Key Switch, it is suggested that the following specification paragraph be used:

Exterior Dimensions: Requires 2 1/4" recessed depth x 3/4" diameter

Mounting: Key switch is designed to be recess mounted

Switch: SPDT or DPDT; 7 A resistive, 4 A inductive, key removable two position

Electrical Data: 

• 7 A resistive, 4 A inductive, (sea level), 28 VDC
• 7 A resistive, 2.5 A inductive, (50,000 ft.), 28 VDC
• 7 A resistive or inductive, 115 VAC, 60 Hz
• UL® and CSA listed: 7 A, 250 VAC
• Temperature tolerance up to +180º F

P/N: 3500 Series Knox Gate & Key Switch (mfr’s cat. ID)


Right click HERE to download complete Spec Sheet



Need help finding the right product? Happy to help!

Contact US!

Ordering Support:

Call Us: 720-710-KNOX (5669)

Email Us:

Or simply right click HERE to send us a message!


6311 Washington St.
Unit H
Denver, CO 80216

MON-FRI 9:00AM-5:00 PM MST

We are happy to help with any questions that you may have.

What Product Model Do I Need to Order?

Contact your local Fire or Public Safety Department for Knox product recommendations.

What is Dual Lock For?

Dual locks allow shared agency access so first responders can immediately gain access during emergencies. For example, fire departments, law enforcement, and emergency medical services may share access to properties in their local jurisdictions.

What are Spec Sheets?

Spec sheets are available on this page under the "Brochures & Specs" section or can be found here.

Who installs the Gate & Key Switch?

Your Knox Gate & Key Switch can be installed by any trusted electrician, maintenance professional, handyman, or contractor.

Where do I install Knox Gate & Key Switches or Padlocks?

Knox Gate & Key Switches override electronic gates to allow first responders rapid access. Gate & Key Switch installation is usually at the entrance of gated communities and apartment complexes, as well as roll up doors. Knox Padlocks provide shared access between multiple agencies for industrial yards, fire access gates, schools, apartment complexes, and more.

Have More Questions?

Click here to email us your questions. Or give us a call 720-710-KNOX (5669)

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