1-Channel 20A SPST Relay Board: RLY501
- Provides quick and easy relay wiring
- Single SPST Normally-Open relay and driver
- Accepts TTL logic level control input
- Available in 5V, 12V, and 24V coil voltages
- Screw terminal connections
- Convenient for CNC projects
- LED indicator for relay status
- Relay contacts rated for 20A at 250VAC
- Rated for 1 HP AC motors, 100k cycles
- Available in rubber feet or DIN rail mount
General Description
This relay board provides a convenient way to add a relay output to your project, allowing you to switch high-current loads such as an AC appliance, motor (up to 1 HP), compressor, heater, and more. This board includes a single SPST relay, logic-level relay driver circuit, and a protection diode. Simply provide the board with power, connect your logic-level signal to the input, and the relay contact is 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 28V) 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 or BeagleBoard).
This product is currently available with 12 VDC relay coils. Two additional coil voltages (5 VDC and 24 VDC) will be offered in the future, allowing you to choose whichever is most convenient for your project. Suitable wall power supplies for the 5V and 12V models are available from Winford Engineering.
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 3.0VDC up through 28VDC will activate the relay. See datasheet for input current requirements.
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.RLY501-12V-DIN
Click image to enlarge. Rail not included
RLY501-12V-FT
Click image to enlarge.Product Documents
| Part # | Description | Data Sheet | Schematic | PDF Drawing | DWG Drawing | IGES Model | STEP Model |
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| RLY501-xxV-DIN | RLY501 1-Channel Relay Board, DIN Mount | 
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| RLY501-xxV-FT | RLY501 1-Channel Relay Board, Rubber Feet |
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RLY501 1-Channel Relay Board, DIN Mount
RLY501 1-Channel Relay Board, Rubber Feet
Product Details
- Single SPST Normally-Open relay and driver
- Accepts TTL logic level control input
- Available in 5V, 12V, and 24V coil voltages
- LED indicator for relay status
- Relay contacts rated for 20A at 250VAC
- Rated for 1 HP AC motors, 100k cycles
- Screw terminals for control inputs
- Screw terminals for contacts
- Power supply may be connected via DC power jack or via screw terminals.
- Approximate dimensions: 3.4" x 2.1"
- Available in rubber feet or DIN rail mount
Pricing and Ordering
| Product # | Description | 1+ | 10+ | RoHS | Buy Now |
|---|---|---|---|---|---|
12V Power: |
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| RLY501-12V-DIN | Relay Board, TTL, 20A SPST, 1 relay, 12V DC, DIN mount | $33.70 | $31.05 | Yes |
Out of stock |
| RLY501-12V-FT | Relay Board, TTL, 20A SPST, 1 relay, 12V DC, Feet | $32.10 | $29.45 | Yes |
Out of stock |
| 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 | |
Out of stock. ETA Jan 8, 2025
| Quantity | Price |
|---|---|
| 1+ | $33.70 |
| 10+ | $31.05 |
Out of stock. ETA Jan 8, 2025
| Quantity | Price |
|---|---|
| 1+ | $32.10 |
| 10+ | $29.45 |
| Quantity | Price |
|---|---|
| 1+ | $6.95 |
| 10+ | $6.50 |
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.