2 layers53 × 67.8 mm
2 layers98 × 67.8 mm
Eumesmo rl-8ch8a v1
thermseekr/eumesmo-rl-8ch8aRelay board with 8x 24V 8A NO relays.
- Size
- 98 × 67.8 mm
- Copper layers
- 2
- Thickness
- 1.69 mm
- Parts
- 48
- Nets
- 33
- Pads
- 138
- Tracks, vias
- 341, 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Nov 2024
- Updated
- 19 Oct 2026
Overview
Eumesmo rl-8ch8a v1 is an open-source printed circuit board by thermseekr, from the thermseekr/eumesmo-rl-8ch8a repository on GitHub. It is a 2-layer board of 98 × 67.8 mm with 48 parts on 33 nets, routed with 341 tracks and 2 vias.
It is built around the G5Q-1A4-DC24V and DB142V-5.08-4P-GN. Its parts include 16 diodes, 8 resistors, 8 switches and 7 connectors. It belongs with the home automation and IoT boards of this library.
Main components
2README
README.mdeumesmo-rl-8ch8a
Relay board with 8x 24 VDC NO relays. This board is designed to be used togheter with eumesmo-io-24v16ch, but can be driven by any 24V control circuit compatible with NPN inputs. It uses Omron 10A relays and is limited to 8A/channel per copper trace capacity.
The board is compatible with the SP7 DIN rail system from Metaltex.
VERSION HISTORY
V1.2 - 2026/06/13 - Repository renamed from RELAY-24V-4CH-8A to eumesmo-rl-4ch8A to align the design with the eumesmo line of building automation products.
V1.1 - 2026/06/13 - Input terminal blocks replaced from 2.54mm to 3.5mm pitch for easier installation in the field.
V1.0 - 2024/11/24 - Initial release.
LICENSE
This project is licensed under the Creative Commons BY-NC 4.0 License. Commercial use is not permitted without prior written consent. See the LICENSE.txt file for details.
Parts
48| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k/125mW | Tales:R_0805_2012Metric | R1, R2, R3, R4, R5, R6, R7, R8 |
| 8 | 1N4148 | Tales:D_SOD-123 | D2, D4, D6, D8, D10, D12, D14, D16 |
| 8 | 275VAC | Tales:RV_Disc_D9.50mm_W3.6mm_P5.08mm | RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8 |
| 8 | G5Q-1A4-DC24V | Tales:Relay_SPST_Omron-G5Q-1A | K1, K2, K3, K4, K5, K6, K7, K8 |
| 8 | ORANGE/0603 | Tales:LED_0603_1608Metric | D1, D3, D5, D7, D9, D11, D13, D15 |
| 4 | DB142V-5.08-4P | Tales:TerminalBlock_Dibo_DB142V-5.08-4P_1x04_P5.08mm_Vertical | J4, J5, J6, J7 |
| 2 | 250-204 | Tales:TerminalBlock_Wago_250-204_1x04_P3.5mm_45Degree | J2, J3 |
| 1 | 250-202 | Tales:TerminalBlock_Wago_250-202_1x02_P3.5mm_45Degree | J1 |
| 1 | LOGO | Tales:Eumesmo_small_silk | G*** |
Questions
How big is the Eumesmo rl-8ch8a v1 PCB?
It measures 98 × 67.8 mm and has 2 copper layers, 1.69 mm thick.
What parts does the Eumesmo rl-8ch8a v1 use?
48 parts, built around the G5Q-1A4-DC24V and DB142V-5.08-4P-GN. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Eumesmo rl-8ch8a v1 KiCad files?
From the thermseekr/eumesmo-rl-8ch8a repository on GitHub, at the commit this page was made from: the board is V1/eumesmo-rl-8ch8a-v1.kicad_pcb and its schematic V1/eumesmo-rl-8ch8a-v1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Eumesmo rl-8ch8a v1 design in my own project?
Its repository states no licence, so its author keeps all rights: ask thermseekr before reusing the design.
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