4-Channel 15A SPDT Relay Board: RLY204
- Conveniently add relay outputs to your project
- Provides quick and easy relay wiring
- Four SPDT relays and drivers
- Accepts TTL logic level control inputs
- Available in 5V, 12V, and 24V coil voltages
- Screw terminal connections
- Convenient for CNC projects
- LED indicator for each relay
- Relay contacts rated for 15A at 250VAC
- Rated for motors up to 1/3 HP at 120VAC, 1/4 HP at 240VAC
- Available with rubber feet or DIN rail mounting options
General Description
This relay board provides a convenient way to add relay outputs to your project, allowing you to switch high-current loads such as AC appliances, motors (up to 1/3 HP at 120V AC), and more. This board includes four SPDT relays, relay driver circuits, and protection diodes. Simply provide the board with power, connect your logic-level signals to the inputs, and the relay contacts are ready to use. The relay contacts are electrically isolated from the rest of the board, which allows the board to be used in a wide variety of applications, including both AC and DC loads.
With this relay board, a logic-level signal (e.g., 3.3V or 5V) or higher-voltage signal (up to 25V) can be used to control a relay. Examples of logic-level signals include the outputs of a PC's parallel port or a microcontroller's output pins (e.g., Arduino or Raspberry Pi).
The board is available with three different relay coil voltages (5, 12, 24 VDC), allowing you to choose whichever is most conveniently available for your project. Suitable wall power supplies for the 5V and 12V models are available below. Please note that the relay coil voltage you select has no effect whatsoever on the voltages you can switch with the relay contacts. Also note that the relay coil voltage you select does NOT affect what voltage is needed for the input control signals. For any of the coil voltage options (5, 12, or 24V), an input control signal from 2.5VDC up through 25VDC will activate the relay. See datasheet for input current requirements.
Note: These relay boards are replacing an older design. To see the details of the legacy design, go to the Relay 104 series.
For a similar board without built-on driver circuitry, please click here.
Mounting Options
These products are available in two different mounting variants. Product numbers ending with -DIN come with DIN clips already installed and ready to snap onto 35mm or 32mm DIN rail. Product numbers ending with -FT have stick-on rubber feet installed on the bottom side, allowing for benchtop use or panel mounting. For panel mounting, we suggest 1/4" nylon standoffs under the mounting holes, and #6 screws.RLY204-5V-DIN
Click image to enlarge. Rail not included
RLY204-5V-FT
Click image to enlarge.Product Documents
| Part # | Revision | Description | Data Sheet | Schematic | PDF Drawing | DWG Drawing | IGES Model | STEP Model | App Note | Document |
|---|---|---|---|---|---|---|---|---|---|---|
| RLY204-xxV-xxx | A | 4-Channel Relay Board | 
|
| ||||||
| RLY204-xxV-DIN | B | 4-Channel Relay Board, DIN Mount |
|
|
| 
| 
| 
| ||
| RLY204-xxV-FT | B | 4-Channel Relay Board, Rubber Feet |
|
|
|
|
|
| ||
| RLY Series | Selecting a Relay for a Motor Load |
| ||||||||
| RLY 10x & 20x | 10x and 20x Product Differences |
| ||||||||
| RLY Series Comparison | Relay Series Product Comparison Guide |
|
4-Channel Relay Board
4-Channel Relay Board, DIN Mount
4-Channel Relay Board, Rubber Feet
Selecting a Relay for a Motor Load
10x and 20x Product Differences
Relay Series Product Comparison Guide
Product Details
- Four SPDT relays and drivers
- Accepts TTL logic level control inputs
- Available in 5V, 12V, and 24V coil voltages
- LED indicator for each relay
- Relay contacts rated for 15A at 250VAC
- Rated for motors up to 1/3 HP at 120VAC, 1/4 HP at 240VAC
- Screw terminals for control inputs(accepts 16-26 AWG wire)
- Screw terminals for contacts (accepts 12-24 AWG wire)
- 0.1" header provided for input control signals (in addition to screw terminals)
- Power supply may be connected via DC power jack or via screw terminals.
- Approximate dimensions: 3.0" x 6.2"
- Available with rubber feet or DIN rail mounting options
Product Revisions
Revision B of these boards introduced a 100 ohm resistor in series with the input of each channel, for increased driver chip protection. These are essentially identical (form / fit / function) and still meet the same published electrical specifications. See Also: Rev B schematic and datasheet documents above.Currently Shipping Revision: All part numbers are shipping Rev B, with the exception of the clearance Rev A products as marked below.
Pricing and Ordering
| Product # | Description | 1+ | 10+ | RoHS | Buy Now |
|---|---|---|---|---|---|
5V Power: |
|||||
| RLY204-5V-DIN | Relay Board, TTL, 15A SPDT, 4 relays, 5V DC, DIN Rail Mount | $60.45 | $55.10 | Yes | |
| RLY204-5V-FT | Relay Board, TTL, 15A SPDT, 4 relays, 5V DC, Feet | $58.85 | $53.50 | Yes | |
| WSD050-10-0 | Wall Power Supply, Switching, 5V DC, 1A, 5.5 x 2.1mm Barrel, Center Positive, 90-264V AC Input | $6.95 | $6.50 | Yes | |
| RLY204-5V-REV_A-DIN | CLEARANCE: Relay Board, TTL, 15A SPDT, 4 relays, 5V DC, DIN Rail Mount; Older Rev A Version | $36.27 | $33.06 | Yes | |
| RLY204-5V-REV_A-FT | CLEARANCE: Relay Board, TTL, 15A SPDT, 4 relays, 5V DC, Feet, Older Rev A Version | $35.31 | $32.10 | Yes | |
12V Power: |
|||||
| RLY204-12V-DIN | Relay Board, TTL, 15A SPDT, 4 relays, 12V DC, DIN Rail Mount | $60.45 | $55.10 | Yes | |
| RLY204-12V-FT | Relay Board, TTL, 15A SPDT, 4 relays, 12V DC, Feet | $58.85 | $53.50 | Yes | |
| WSD120-04-0 | Wall Power Supply, Switching, 12V DC, 0.4A, 5.5 x 2.1mm Barrel, Center Positive, 90-264V AC Input | $6.95 | $6.50 | Yes | |
24V Power: |
|||||
| RLY204-24V-DIN | Relay Board, TTL, 15A SPDT, 4 relays, 24V DC, DIN Rail Mount | $60.45 | $55.10 | Yes | |
| RLY204-24V-FT | Relay Board, TTL, 15A SPDT, 4 relays, 24V DC, Feet | $58.85 | $53.50 | Yes | |
| Quantity | Price |
|---|---|
| 1+ | $60.45 |
| 10+ | $55.10 |
| Quantity | Price |
|---|---|
| 1+ | $58.85 |
| 10+ | $53.50 |
| Quantity | Price |
|---|---|
| 1+ | $6.95 |
| 10+ | $6.50 |
| Quantity | Price |
|---|---|
| 1+ | $36.27 |
| 10+ | $33.06 |
| Quantity | Price |
|---|---|
| 1+ | $35.31 |
| 10+ | $32.10 |
| Quantity | Price |
|---|---|
| 1+ | $60.45 |
| 10+ | $55.10 |
| Quantity | Price |
|---|---|
| 1+ | $58.85 |
| 10+ | $53.50 |
| Quantity | Price |
|---|---|
| 1+ | $6.95 |
| 10+ | $6.50 |
| Quantity | Price |
|---|---|
| 1+ | $60.45 |
| 10+ | $55.10 |
| Quantity | Price |
|---|---|
| 1+ | $58.85 |
| 10+ | $53.50 |
All of the above items are normally stocked. Please call us if you need to verify availability for a specific quantity, or for pricing at higher quantities. Please visit our ordering page for our ordering policies and a list of ordering methods.