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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4903-9255 AV 24VDC 15CD Red Vert FS
Sale price$157.60
Regular price$189.12
Contact Us for Alternatives
Simplex
Simplex 4901-9858 Non-Addressable Mini-Horn, SmartSYNC, Red, Blank
Sale price$46.10
Regular price$55.32
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4190-6061 PCI Modular Ntwk Intfc Card
Sale price$2,118.30
Regular price$2,541.96
Contact Us for Alternatives
Simplex
Simplex 4100-9863 TCP/IP Physical Bridge Interface Kit, Class B
Sale price$951.50
Regular price$1,141.80
In Stock
Simplex
Simplex 4100-9311 EPS Master Controller 120V
Sale price$3,145.80
Regular price$3,774.96
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Simplex
Simplex 4100-6304 4120 MM-R Duplex Fiber Media Card, Right Port
Sale price$458.30
Regular price$549.96
In Stock
Simplex
Simplex 4100-6303 4120 Duplex Fiber Media Card, Multi-Mode Left Port
Sale price$458.30
Regular price$549.96
In Stock
Simplex
Simplex 4100-6072 SM Fiber Modem Left Port
Sale price$3,481.50
Regular price$4,177.80
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Simplex
Simplex 4100-5115 XPS Expansion Module
Sale price$261.40
Regular price$313.68
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-3110 IDNet 2+2 Addressable SLC Module, 250 Points Total, Four Isolated Class A or B Loops, 4100ES
Sale price$357.35
Regular price$428.82
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-1312 Flex-50, 50 W Amplifier
Sale price$1,522.35
Regular price$1,826.82
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-1287 24 Switch, 24 Red LED Module
Sale price$263.60
Regular price$316.32
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Simplex
Simplex 4100-1274 Microphone MUX Module
Sale price$744.80
Regular price$893.76
Contact Us for Alternatives
Simplex
Simplex 4100-1252 Audio IF Module, SGL Channel
Sale price$230.15
Regular price$276.18
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4081-9306 120 VAC Input
Sale price$5,683.45
Regular price$6,820.14
Contact Us for Alternatives
Simplex
Simplex 2099-9102 Manual Pull Station, Single Action, Annunciator Contacts N.C.
Sale price$62.50
Regular price$75.00
In Stock
Simplex
Simplex 5120-9311 Speaker Volume Control
Sale price$64.55
Regular price$77.46
Only 2 units left
Simplex
Simplex 2975-9443 Bay Back Box with Glass Door and Dress Panel Red
Sale price$1,011.10
Regular price$1,213.32
Not in stock - available on backorder - lead time on request
Simplex
Simplex 2190-9173 MAPNET II 2-Point I/O Module, Supervised Input and Relay Output
Sale price$57.00
Regular price$68.40
In Stock




