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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 2975-9446 Box with Glass Door and Dress Panel
Sale price$1,443.35
Regular price$1,732.02
In Stock
Simplex
Simplex 4009-9812 Triple Channel TrueAlert CLS A
Sale price$134.25
Regular price$161.10
In Stock
Simplex
Simplex 4098-5214 MX Addressable Duct Sensor Housing
Sale price$184.70
Regular price$221.64
In Stock
Simplex
Simplex 4098-9605 TrueAlarm Photoelectric Detector UL Listed
Sale price$47.10
Regular price$56.52
Contact Us for Alternatives
Simplex
Simplex 4098-9614 SSD Heat Detector
Sale price$34.70
Regular price$41.64
Contact Us for Alternatives
Simplex
Simplex 4100-1279 Blank Display Cover, 2 in., 4100ES Panels and Annunciators
Sale price$9.35
Regular price$11.22
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-3206 8 SPDT Aux Relay Module
Sale price$205.60
Regular price$246.72
Contact Us for Alternatives
Simplex
Simplex 4602-9102 Lifealarm Serial Annunciator RCU
Sale price$881.20
Regular price$1,057.44
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4903-9149 SV 24VDC 110CD Red HOR FS
Sale price$148.05
Regular price$177.66
Contact Us for Alternatives
Simplex
Simplex 4905-9838 Sound Damper - Pack with 20 Units
Sale price$28.50
Regular price$34.20
In Stock
Simplex
Simplex 4906-9110 TrueAlert Multi-Candela Strobe
Sale price$85.10
Regular price$102.12
In Stock
Simplex
Simplex 2190-9169 MAPNET II Line Powered Isolator Module, Surface Mount
Sale price$211.25
Regular price$253.50
Only 30 units left
Simplex
Simplex 4100-1276 8 Red Pluggable LED Module
Sale price$107.20
Regular price$128.64
In Stock
Simplex
Simplex 4906-9211 TrueAlert Multi-Candela Dual-Strobe
Sale price$154.80
Regular price$185.76
In Stock
Simplex
Simplex 562-731 8 PT Monitor Class B
Sale price$662.70
Regular price$795.24
Not in stock - available on backorder - lead time on request
Simplex
Simplex 562-827 Power Expansion Supply
Sale price$493.40
Regular price$592.08
Only 1 unit left
Simplex
Simplex 565-554 8 Pt I/O Assy
Sale price$531.00
Regular price$637.20
Not in stock - available on backorder - lead time on request






