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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4098-5612 Fixed Temperature Heat Detector
Sale price$30.10
Regular price$36.12
In Stock
Simplex
Simplex 4904-9346 Visible Notification Appliance Ceiling-Mount
Sale price$52.90
Regular price$63.48
Only 7 units left
Simplex
Simplex 636-062 4100 Microphone Cage Assembly
Sale price$1,235.30
Regular price$1,482.36
Contact Us for Alternatives
Simplex
Simplex 742-346 CPU Board
Sale price$843.90
Regular price$1,012.68
Not in stock - available on backorder - lead time on request
Simplex
Simplex 6310-9231A 12 in. Round Synchronous Clock, Black, 110V
Sale price$282.45
Regular price$338.94
In Stock
Simplex
Simplex 6334-9140 40" Red LED Clock, 120 VAC
Sale price$324.45
Regular price$389.34
Not in stock - available on backorder - lead time on request
Simplex
Simplex 49VO-WWA-A TrueAlert ES Addressable Horn Strobe
Sale price$78.30
Regular price$93.96
In Stock
Simplex
Simplex 4904-9171 TrueAlert Non-Addressable Strobe
Sale price$84.15
Regular price$100.98
Contact Us for Alternatives
Simplex
Simplex 4903-9196 TrueAlert Non-Addressable Speaker Strobe
Sale price$135.15
Regular price$162.18
Contact Us for Alternatives
Simplex
Simplex 4100-6103 (07431140) Dual Class A IDNAC Isolator Module, DCAI
Sale price$374.15
Regular price$448.98
In Stock
Simplex
Simplex 4100-6080 DACT Point or Event Reporting
Sale price$409.60
Regular price$491.52
In Stock
Simplex
Simplex 4100-6038 Dual RS-232 IF Card
Sale price$601.50
Regular price$721.80
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-1245 Flex 50 NAC Expansion
Sale price$124.45
Regular price$149.34
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-0625 Local Mode Transponder Interface Module
Sale price$376.50
Regular price$451.80
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4090-9813 Adapter Plate to Fit Square Electrical Box
Sale price$18.65
Regular price$22.38
In Stock
Simplex
Simplex 4098-9019 Address Beam Detector System
Sale price$1,958.15
Regular price$2,349.78
In Stock
Simplex
Simplex 4009-9602 4009 IDNAC Repeater, Red Cabinet, 120/240 VAC
Sale price$1,080.55
Regular price$1,296.66
In Stock
Simplex
Simplex 2098-9737 Supervised Relay, DPDT, Remote or Base Mount
Sale price$75.30
Regular price$90.36
In Stock





