Apply to be a TradeMaster!
Filter menu expanded

Filters

671 items
Reset

SORT

Product Availability

Show In Stock Only (232)

Product Type

Access Door (4)
Control Module (6)
Electrical Part (424)
Light Switch (1)
Relay (177)
Replacement Part (2)
Switching Relay (5)
Transformer (52)

Mount

DIN Rail (2)
Foot (38)
Hub (36)
Panel (2)
Remote (1)

Price Range

Under $1 (2)
$1 to $5 (9)
$5 to $10 (11)
$10 to $15 (6)
$15 to $20 (12)
$20 to $25 (27)
$25 to $30 (19)
$30 to $35 (28)
$35 to $40 (37)
$40 to $45 (42)

Functional Devices

Help Face
Need a little help?
671 items
Grid
List
Compare
Product Image of Enclosed Power Relay, 20A SPDT, 24 Vac/dc/208-277 Vac Coil, Hi/Lo Voltage Separation, NEMA 1 Housing
$52.45 each
In Stock
Get 1 by Tue, Sep 29
In Stock
Get 1 by Tue, Sep 29
Compare
Product Image of Current Switch & Relay Combination, 20A SPST + Override, 24Vac/dc Coil, Adjustable, .50-20A, 4" Track Mount
Current Switch & Relay Combination, 20A SPST + Override, 24Vac/dc Coil, Adjustable, .50-20A, 4" Track Mount
SKU: RIBMX24SBA
Functional Devices
SKU: RIBMX24SBA
$103.25 each
In Stock
Get 5 by Fri, Sep 25
In Stock
Get 5 by Fri, Sep 25
Compare
Product Image of 48" x 4" Mounting Track for Relays, Current Sensors, and Power Supplies
$33.54 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Enclosed Power Relays, 20A 2 SPDT, 24 Vac/dc Coil, Hi/Lo Voltage Separation, NEMA 1 Housing
$71.30 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Power Meter, 120-277 Vac, 3-Phase, 2.75" Track Mount
$568.10 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Enclosed BACnet MS/TP Network Relay Device, One Binary Output, One Binary Input, 24Vac/dc/208-277Vac Power Input, NEMA 1 Housing
$171.95 each
In Stock
Get 2 by Fri, Sep 25
In Stock
Get 2 by Fri, Sep 25
Compare
Product Image of 4" Track Mount Pilot Relay, 15 Amp 2 SPDT, with 10-30 VAC/DC/120 VAC Coil
$44.80 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of 14.5" H x 7.7" W x 3.9" D Metal Enclosure, NEMA 1
$92.70 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Enclosed Power Relay, 30A SPST-N/O + SPST-N/C, 24 Vac/dc Coil, Hi/Lo Voltage Separation, NEMA 1 Housing
$113.95 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Solid Core, Current Transducer, Analog, 0-5 Vdc Output, 0-50 Amp, Terminals
$31.20 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Split Core, Current Switch, Adjustable, 0.75-150 Amp, Wire Leads
$78.05 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Current Switch and Relay Combination, 20 Amp 3PST-N/O, 24Vac/dc Coil, Internal Adjustable, 0.5-20 Amp
$175.60 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Single 75 VA Power Supply, Multi-tap 480/277/240/208/120 to 24 Vac, UL Class 2, Secondary Wires, Metal Enclosure
$223.70 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of 2.75" Track Mount Pilot Relay, 15 Amp SPST & Override, with 24 VAC/DC Coil
$32.10 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of BACnet MS/TP Network Relay Device w/ Binary Outputs & Binary/Analog Inputs, 24 Vac/dc Power Input, 2.75" Track Mount
$199.05 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Flush Surface Mount Backplate Kit for WWS2-EN3 Wireless Wall Switch - White
$18.25 each
In Stock
Get 1 by Fri, Sep 25
In Stock
Get 1 by Fri, Sep 25
Compare
Product Image of DIN Rail Mount Relay, 10 Amp SPDT w/ Override, 10-30 VAC/DC Coil
$40.45 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Current Switch and Relay Combination, 10A SPST + Override, 10-30 v Coil, Adj, 0.50-10A
$117.80 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of BACnet MS/TP Network Relay Device w/ Binary Output Set Point, One Binary Output + Override, 24 Vac/dc Power Input, NEMA 1 Housing
$217.60 each
In Stock
Get 2 by Mon, Sep 28
In Stock
Get 2 by Mon, Sep 28
Compare
Product Image of EnOcean 902 MHz Wireless Vacancy / Occupancy Sensor - Ceiling Mount
$228.54 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of 600 VA UPS Backup Power Control Center, BACnet MS/TP Network, 12" x 14" x 6" Metal Enclosure
$617.05 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Single 100 VA, UL Class 2, 10A Main Breaker w/input Extension Cord (120 Vac to 24 Vac Enclosure)
$220.20 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Enclosed Current Switch, Fixed, 0.50-30A, NEMA 1 Housing
$52.10 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of 12-1/8" x 12-1/8" x 6" Metal Housing, NEMA 1
$166.00 each
In Stock
Get 6 by Fri, Sep 25
In Stock
Get 6 by Fri, Sep 25
Compare
Product Image of Enclosed Low Input/Optoisolated Relay, 20A DPDT + Override, 208-277 Vac Power Input, 5-25 Vac/dc Control Input, Hi/Lo Voltage Separation, NEMA 1 Housing
$166.75 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Enclosed Pilot Relay, 10A DPDT w/ 24 Vac/DC/208-277 Vac Coil, Red Housing
$53.55 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of DIN Rail Mount DC Power Supply, Single Switching, 100-240 Vac to 24-28 Vdc, 2.5A, Screw Terminals, Class 2
$97.50 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of 4" Track Mount Power Relay, 30 Amp 3PDT, with 24 VAC/DC Coil
$120.20 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Transformer, 40 VA, 24 to 24 Vac, Foot and Single Threaded Hub Mount
$27.75 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Pilot Panel Relay, 15A SPDT + Override w/ 12 Vac/DC Coil, 4" Track Mount
$29.15 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of DIN Rail Mount Relay, 10 Amp DPDT, 24 VAC/DC Coil
$41.85 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Enclosed Low Input/Optoisolated Relay, 20A SPST + Override, 24 Vac/dc Power Input, 5-25 Vac/dc Control Input, Hi/Lo Voltage Separation, NEMA 1 Housing
$80.25 each
In Stock
Get 1 by Wed, Sep 30
In Stock
Get 1 by Wed, Sep 30
Compare
Product Image of DIN Rail Mount Relay 10 Amp DPDT w/ Override, 24 VAC/DC Coil
$61.50 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Split Core, Current Switch, Fixed, 0.50-150 Amp, Terminal
$54.40 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Meta Enclosure Replacement Keys (Set of 2)
$5.30 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Power Control Center, 10A Switch / Circuit Breaker, 120 Vac, 2 Outlets, Wires, NEMA 1 Housing
$68.45 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Single 100 VA, UL Class 2, Secondary Wires, 10A Main Breaker (120 Vac to 24 Vac Enclosure)
$186.75 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Enclosed Low Input/Optoisolated Relay, 20A DPDT + Override, 120 Vac Power Input, 5-25 Vac/dc Control Input, Hi/Lo Voltage Separation, NEMA 1 Housing
$180.05 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Transformer, Made in USA, 96 VA, 480/277/240/208/120 to 24 Vac, Circuit Breaker, Foot and Dual Threaded Hub Mount
$77.65 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of DIN Rail Mount DC Power Supply, Single Switching, 100-240 Vac to 24-28 Vdc, 3.8A, Screw Terminals, Class 2
$136.50 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Transformer, 20VA, 277 to 24 Vac, Foot and Single Threaded Hub Mount
$21.10 each
In Stock
Get 4 by Fri, Sep 25
In Stock
Get 4 by Fri, Sep 25
Compare
Product Image of 10" x 7-7/10" x 3-9/10" Metal Housing, NEMA 4/4X
$188.75 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Enclosed Self-Powered Split Core Current Transformer with 333 mV Output (200A)
$136.55 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Wall Switch Plate Replacement - White
$1.75 each
In Stock
Get 1 by Fri, Sep 25
In Stock
Get 1 by Fri, Sep 25
Compare
Product Image of Split Core AC Transducer, 0-10 Amp, 0-5 Vdc Output, Terminals
$40.15 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of Current Switch, Split Core, Adjustable, 0.75-150A, 120-277 Vac, Terminal
$73.25 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Compare
Product Image of Enclosed Self-Powered Solid Core Current Transformer with 333 mV Output (100A)
$54.42 each
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Backorder
Get it by Thu, Oct 22 - Thu, Nov 19
Compare
Product Image of 23.00" H x 11.75" W x 0.25" Perforated Steel Sub-Panel, For Use with MH3800
23.00" H x 11.75" W x 0.25" Perforated Steel Sub-Panel, For Use with MH3800
SKU: SP3804L
Functional Devices
SKU: SP3804L
$154.20 each
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Out of Stock
Get it by Thu, Oct 8 - Thu, Oct 15
Resources
FAQs, Manuals & Videos
Articles
More About Functional Devices
Functional Devices, Inc. has been designing and manufacturing quality electronic devices in the USA since 1969. Current product offerings include relays, current sensors, power control, enclosures, power supplies, transformers, and accessories. Functional Devices has established itself as a leader in the HVAC, Building Controls, Energy Management, Energy Savings, Lighting Controls, and Wireless industries.