Simplex, now part of Johnson Controls, is one of the most widely installed fire alarm brands in North America. Simplex systems are found in hospitals, universities, airports, high rises and industrial plants, and they are maintained for decades rather than replaced. That long service life is exactly why the parts are hard to find, and it is what this collection is aimed at.
With well over a thousand Simplex line items in stock, we cover:
- Simplex smoke detectors and sensors - photoelectric, heat, combination photoelectric and heat, and carbon monoxide sensors, plus replacement cartridges
- Sensor bases, including standard, sounder and relay bases
- Duct detectors, duct housings and duct covers
- Addressable modules - individual addressable modules, zone adapter modules, relay modules and NAC extenders
- Single and double action pull stations, break rods and station keys
- Horns, strobes, horn strobes and speaker strobes, wall and ceiling mount
- Device covers, cover plates and trim in red and white
Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations. If a part is not listed, send the number through our quote page.

Simplex
Simplex 673-053 6100-Key Pad Assembly
Sale price$57.00
Regular price$68.40
Only 2 units left
Simplex
Simplex 740-886 4100-0108 Power Supply
Sale price$633.85
Regular price$760.62
Only 2 units left
Simplex
Simplex 6310-9226 Industrial Synchronous Wall Mount
Sale price$421.20
Regular price$505.44
Only 1 unit left
Simplex
Simplex 6310-9321 Electric Synchronous Nsr 12" Round
Sale price$344.80
Regular price$413.76
Only 1 unit left
Simplex
Simplex 565-089 PC BD 6464 Ledsw Control
Sale price$549.65
Regular price$659.58
Not in stock - available on backorder - lead time on request
Simplex
Simplex 6334-9142 (0643637) Amber LED 120 VAC
Sale price$198.25
Regular price$237.90
In Stock
Simplex
Simplex 565-143 TrueAlarm Duct Interface Board, Without Relay
Sale price$155.00
Regular price$186.00
Only 12 units left
Simplex
Simplex 733-621 Battery Block to Battery Harness, Legacy 4100
Sale price$15.75
Regular price$18.90
In Stock
Simplex
Simplex 740-801 4100 Universal Power Supply PROM (Programmed IC)
Sale price$25.20
Regular price$30.24
Only 7 units left

