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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4100-5451 IDNAC Addressable Notification SLC Module for 4100ES ES Power Supplies
Sale price$394.55
Regular price$473.46
In Stock
Simplex
Simplex 49HF-APPLC TrueAlert ES High-Fidelity Addressable Speaker
Sale price$110.50
Regular price$132.60
In Stock
Simplex
Simplex 4010-9819 Fiber Media Card
Sale price$752.50
Regular price$903.00
Contact Us for Alternatives
Simplex
Simplex 2099-9762 Single Action Pull Station with Institutional Cover, Non-Addressable
Sale price$65.90
Regular price$79.08
In Stock
Simplex
Simplex 2099-9101 Non-Addressable Single Action Pull Station, N.O. Annunciator Contacts
Sale price$57.00
Regular price$68.40
In Stock
Simplex
Simplex 4098-9402 Lifealarm Heat Detector
Sale price$57.20
Regular price$68.64
Only 36 units left
Simplex
Simplex 4905-9997 TrueAlert White S/V Replacement Cover, Red FIRE Lettering
Sale price$16.05
Regular price$19.26
In Stock
Simplex
Simplex 4906-9132 Weatherproof Horn Strobe, Non-Addressable Wall Mount, White Housing with Red FIRE Lettering
Sale price$123.55
Regular price$148.26
In Stock
Simplex
Simplex 4906-9256 TrueAlert Addressable Multi-Candela Speaker Strobe
Sale price$99.65
Regular price$119.58
In Stock
Simplex
Simplex 49SO-APPLC TrueAlert ES Addressable Speaker
Sale price$128.25
Regular price$153.90
In Stock
Simplex
Simplex 49SVC-CWFIRE SV Cover, Ceiling, White, FIRE
Sale price$17.40
Regular price$20.88
In Stock
Simplex
Simplex 2975-9211 Weatherproof Surface Mount Back Box, Cast Aluminum, Red, NEMA 3R
Sale price$139.70
Regular price$167.64
In Stock
Simplex
Simplex 4100-6308 NIC Dual-Channel Single-Mode Fiber
Sale price$543.10
Regular price$651.72
In Stock
Simplex
Simplex 565-831 4098 Series Two-Wire Duct Sensor PC Board Assembly, Replacement Part
Sale price$39.45
Regular price$47.34
Not in stock - available on backorder - lead time on request
Simplex
Simplex 562-974 Mapnet Power Supply Board
Sale price$429.85
Regular price$515.82
Contact Us for Alternatives
Simplex
Simplex 49VOH-APPLC TrueAlert ES Addressable Strobe
Sale price$112.40
Regular price$134.88
In Stock
Simplex
Simplex 49MT-WWF TrueAlert Addressable MultiTone Horn
Sale price$74.95
Regular price$89.94
In Stock






