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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4100-1241 8 Minute Message Expansion Module, 4100ES Audio
Sale price$117.20
Regular price$140.64
In Stock
Simplex
Simplex 4904-9172 TrueAlert Non-Addressable Strobe
Sale price$64.90
Regular price$77.88
Only 13 units left
Simplex
Simplex 49SOC-WRFIRE TrueAlert ES Speaker Cover, Wall, Red, FIRE
Sale price$8.40
Regular price$10.08
In Stock
Simplex
Simplex 2975-9022 Cast Aluminum Surface Mount Box, Red
Sale price$94.80
Regular price$113.76
In Stock
Simplex
Simplex 4100-9922 4100ES Retrofit Kit, 3 Bay, Beige, Glass Door
Sale price$1,773.70
Regular price$2,128.44
In Stock
Simplex
Simplex 566-075 4100UES EXT Power Supply BD
Sale price$363.55
Regular price$436.26
Not in stock - available on backorder - lead time on request
Simplex
Simplex 2301-9513 CLST-Line AMP Single 120V
Sale price$337.15
Regular price$404.58
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4004-9860 4PT Auxiliary Relay Module
Sale price$192.95
Regular price$231.54
Not in stock - available on backorder - lead time on request
Simplex
Simplex 49AO-APPLC TrueAlert ES Addressable Horn
Sale price$82.60
Regular price$99.12
In Stock
Simplex
Simplex 2099-9795 Addressable Single Action Manual Pull Station, MAPNET II
Sale price$67.80
Regular price$81.36
Contact Us for Alternatives
Simplex
Simplex 49MP-SOWR Mounting Plate, Red
Sale price$7.95
Regular price$9.54
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-1270 Master Telephone with Control Module
Sale price$559.90
Regular price$671.88
In Stock
Simplex
Simplex 650-2493 Main System Slave
Sale price$1,064.75
Regular price$1,277.70
Not in stock - available on backorder - lead time on request
Simplex
Simplex 49VOC-CRF Cover, Red, FIRE
Sale price$5.70
Regular price$6.84
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4001-9403 CPU Replacement Board for the 4001 (562-703)
Sale price$2,376.00
Regular price$2,851.20
Contact Us for Alternatives








