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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4098-9854 TrueAlarm Duct Sampling Tube, 12 in. Duct Width, CPVC
Sale price$6.75
Regular price$8.10
In Stock
Simplex
Simplex 4090-9006 Release Periph and Enclosure
Sale price$339.00
Regular price$406.80
In Stock
Simplex
Simplex 4098-9795 Sounder Base Dual Address
Sale price$66.00
Regular price$79.20
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Simplex
Simplex 4100-2300 Expansion Bay Assembly for 4100ES Fire Alarm Control Panels, Non-Audio
Sale price$351.05
Regular price$421.26
In Stock
Simplex
Simplex 4905-9903 Adapter Plate, TrueAlert S/V to 2975-9145 Back Box
Sale price$29.35
Regular price$35.22
In Stock
Simplex
Simplex 6334-9802 Celestra 2000 Clock Wall Mounting Plate
Sale price$11.00
Regular price$13.20
In Stock
Simplex
Simplex 4905-9947 Adapter Skirt White
Sale price$10.20
Regular price$12.24
Not in stock - available on backorder - lead time on request
Simplex
Simplex 742-590 2X40 Master Operator Interface Assembly, 4100U and 4100ES CPU Bay Door
Sale price$716.35
Regular price$859.62
In Stock
Simplex
Simplex 49MTV-WRF TrueAlert Addressable MultiTone Horn Strobe
Sale price$124.05
Regular price$148.86
In Stock
Simplex
Simplex 4905-9914 Synchronized Flash Module
Sale price$45.15
Regular price$54.18
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4090-9120 IDNet 6-Point I/O Module, 4 T-Sense Inputs and 2 Relay Outputs
Sale price$93.70
Regular price$112.44
In Stock
Simplex
Simplex 4010-9817 Modular Network Interface Module for 4010 Panels
Sale price$353.95
Regular price$424.74
In Stock
Simplex
Simplex 4009-9808 Dual Class A NAC Adapter for 4009 IDNet NAC Extender
Sale price$74.95
Regular price$89.94
In Stock
Simplex
Simplex 2099-9813 Pull Station Flush Trim
Sale price$38.50
Regular price$46.20
Not in stock - available on backorder - lead time on request
Simplex
Simplex 2081-9027 Isolated Loop Circuit
Sale price$51.95
Regular price$62.34
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4009-9601 4009 IDNAC Repeater Platinum 120/240
Sale price$1,168.80
Regular price$1,402.56
In Stock







