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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4906-9108 TrueAlert Multi-Candela Strobe
Sale price$45.70
Regular price$54.84
In Stock
Simplex
Simplex 49AO-WRF TrueAlert ES Addressable Audible Only Horn, Wall Mount, Red, FIRE Lettering
Sale price$52.05
Regular price$62.46
In Stock
Simplex
Simplex 562-939 MAPNET II Signal ZAM, Style Y (Class B)
Sale price$82.55
Regular price$99.06
Only 10 units left
Simplex
Simplex 566-060 Control Board
Sale price$149.05
Regular price$178.86
Not in stock - available on backorder - lead time on request
Simplex
Simplex 631-114 Air Duct Housing Baffle, 4098-9826
Sale price$40.35
Regular price$48.42
Only 24 units left
Simplex
Simplex 677-201 Sensor Base with Relay
Sale price$60.45
Regular price$72.54
Not in stock - available on backorder - lead time on request
Simplex
Simplex 8565-158 Mapnet Insolator Board
Sale price$482.80
Regular price$579.36
Contact Us for Alternatives
Simplex
Simplex 4100-6077 MX Digital Loop Card for 4100ESi, 250 Devices
Sale price$282.75
Regular price$339.30
In Stock
Simplex
Simplex 734-008 PDI Power/Comm Bay-to-Bay Harness, 24 in.
Sale price$10.35
Regular price$12.42
In Stock
Simplex
Simplex 565-045 4100 8 PT Relay Board
Sale price$198.10
Regular price$237.72
Contact Us for Alternatives
Simplex
Simplex 565-233 4100 Remote Interface II
Sale price$240.00
Regular price$288.00
Not in stock - available on backorder - lead time on request
Simplex
Simplex 6310-9075A Round Slimline
Sale price$522.90
Regular price$627.48
Not in stock - available on backorder - lead time on request
Simplex
Simplex 2084-9005 Phone Armor Cable Flush Mount Red
Sale price$418.95
Regular price$502.74
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4010-9911 Alarm Relay Module, 4010ES MSS
Sale price$97.40
Regular price$116.88
In Stock









