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Much of what we hold is discontinued or superseded Simplex stock kept specifically for existing installations.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 4098-5680 5 2Wire IDC Powered Relay Base
Sale price$73.90
Regular price$88.68
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Simplex
Simplex 4100-0632 Utility Block 16 Terminals
Sale price$90.70
Regular price$108.84
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4903-9419 Wall Mount Audible/Visible Horn Strobe, Fixed Candela, Non-Addressable
Sale price$76.50
Regular price$91.80
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Simplex
Simplex 59WPBB-WW Back Box Surface-Mounted Weatherproof White
Sale price$79.25
Regular price$95.10
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4098-9784 Standard Sensor Base, 4 in., IDNet and MAPNET II
Sale price$74.90
Regular price$89.88
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Simplex
Simplex 49SVC-CWFIRE-O Cover, Weatherproof, White, "FIRE"
Sale price$19.80
Regular price$23.76
In Stock
Simplex
Simplex 746-180 3 Ethernet Cable
Sale price$17.30
Regular price$20.76
Not in stock - available on backorder - lead time on request
Simplex
Simplex 59AV-APPLWWH-O TrueAlert ES LED Addressable Horn Strobe
Sale price$254.30
Regular price$305.16
Not in stock - available on backorder - lead time on request
Simplex
Simplex 2975-9463 Semi-Flush Mount Box Adapter, Red, for 4606 Series Color Touchscreen LCD Annunciators
Sale price$132.00
Regular price$158.40
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4099-9004CF Single Action Pull Station
Sale price$72.65
Regular price$87.18
In Stock
Simplex
Simplex 734-075 Power/Comm Box to Box Harness, 4100-0636
Sale price$24.00
Regular price$28.80
In Stock
Simplex
Simplex 4006-9802 Expansion IDC Module Conventional
Sale price$231.80
Regular price$278.16
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Simplex
Simplex 4100-2320 Audio Expansion BAY
Sale price$16.10
Regular price$19.32
Not in stock - available on backorder - lead time on request
Simplex
Simplex 2080-9057 Surface Mount Abort Switch
Sale price$199.55
Regular price$239.46
In Stock
Simplex
Simplex 734-257 4100ES Harness, Power Distribution Module to Extended Power Supply, 120 V
Sale price$84.60
Regular price$101.52
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Simplex
Simplex 59WPBB-WR Weatherproof Red Surfacemounted Singlegang Mounting Box with Weatherproof Gasket, Painted Version of Model 7219K23.
Sale price$39.35
Regular price$47.22
Not in stock - available on backorder - lead time on request
Simplex
Simplex 4100-3111 Short Circuit Isolating Loop Output Module
Sale price$77.15
Regular price$92.58
In Stock
Simplex
Simplex 2098-9484 Heat Detector Vert NO 302135
Sale price$63.20
Regular price$75.84
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Simplex
Simplex 4009-9301 NAC Extender 240VAC IDNET
Sale price$1,083.60
Regular price$1,300.32
In Stock
Simplex
Simplex 166-227 Flex Cable 6'' Long 26 POS-41
Sale price$15.00
Regular price$18.00
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