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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4098-9751 SSD In-Duct Sensor Housing
Sale price$178.20
Regular price$213.84
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4098-9792E E-Series Standard Sensor Base
Sale price$29.90
Regular price$35.88
In Stock
Simplex
Simplex 4098-9830 Remote Red LED Alarm Indicator
Sale price$14.00
Regular price$16.80
In Stock
Simplex
Simplex 4100-1327 Flex-50 Digital Audio Amplifier, 50 W, 70.7 VRMS, 3 Class B NACs
Sale price$916.10
Regular price$1,099.32
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4902-9717 TrueAlert Speaker Wall-Mount
Sale price$41.00
Regular price$49.20
In Stock
Simplex
Simplex 4903-9150 Audible Visible Notification
Sale price$144.15
Regular price$172.98
Contact Us for Alternatives
Simplex
Simplex 562-856 Motherboard, Style B (Class B), 4100
Sale price$69.20
Regular price$83.04
In Stock
Simplex
Simplex 4098-9404 Lifealarm Heat Detector
Sale price$60.75
Regular price$72.90
Contact Us for Alternatives
Simplex
Simplex 4100-0621 (742-534) Analog Audio Riser
Sale price$106.25
Regular price$127.50
In Stock
Simplex
Simplex 4904-9184 Visible Notification Appliance, Ceiling-Mount
Sale price$61.00
Regular price$73.20
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4906-9133 Chime Strobe Wall Red
Sale price$80.10
Regular price$96.12
Contact Us for Alternatives
Simplex
Simplex 49HFVH-APPLC TrueAlert ES Addressable Speaker Strobe
Sale price$177.75
Regular price$213.30
In Stock
Simplex
Simplex 49MT-WWF-BA TrueAlert Addressable MultiTone Horn
Sale price$124.25
Regular price$149.10
In Stock
Simplex
Simplex 49WPBB-SVCR Back Box, Ceiling Surface-Mounted
Sale price$40.30
Regular price$48.36
In Stock
Simplex
Simplex 49WPBB-SVCW TrueAlert ES Ceiling Surface/Weatherproof Back Box, White
Sale price$34.30
Regular price$41.16
In Stock
Simplex
Simplex 4905-9846 Cover, White, "ALERT"
Sale price$20.70
Regular price$24.84
Not in stock - available on backorder - lead time on request
Simplex
Simplex 2099-9144 Explosion-Proof Weatherproof Pull Station
Sale price$606.60
Regular price$727.92
In Stock
Simplex
Simplex 4100-7401 24 Point I/O Graphic Module
Sale price$662.25
Regular price$794.70
Contact Us for Alternatives
Simplex
Simplex 4090-5250 MX Multiple I/O Module, 3 Class B Inputs, 2 Form C Relay Outputs, for 4100ES/4010ES with MX Loop Module
Sale price$135.15
Regular price$162.18
In Stock




