1. Introduction
This manual provides essential information for the installation, operation, and maintenance of the Hirschmann RS20-0800T1T1SDAUHH Ethernet Rail Switch. This unmanaged Fast Ethernet switch is designed for industrial applications, offering reliable network connectivity with 8 ports and DIN rail mounting capabilities. Please read this manual thoroughly before operating the device.

Figure 1: Hirschmann RS20-0800T1T1SDAUHH Ethernet Rail Switch in its original packaging. The packaging indicates the model number and brand for verification.
2. Setup and Installation
Follow these steps for proper installation of your Hirschmann RS20-0800T1T1SDAUHH switch.
2.1 Unpacking
- Carefully remove the switch from its packaging.
- Verify that all components are present and undamaged. The package should contain the switch and any included hardware.
2.2 Mounting
The RS20-0800T1T1SDAUHH is designed for DIN rail mounting.
- Attach the switch securely to a standard DIN rail in an industrial enclosure.
- Ensure adequate ventilation around the device to prevent overheating.
2.3 Power Connection
Connect the power supply to the switch.
- The switch operates on 24V AC or 24-48V DC.
- Ensure the power source matches the specified voltage range.
- Connect the power cables to the designated power input terminals on the switch.
2.4 Network Connections
Connect Ethernet devices to the switch ports.
- The switch features 8 Fast Ethernet ports.
- Use standard Ethernet cables (e.g., Cat5e or Cat6) to connect your network devices (e.g., PLCs, industrial PCs, sensors) to any of the 8 ports.
- The switch automatically detects link speed and duplex mode.

Figure 2: The Hirschmann RS20-0800T1T1SDAUHH switch, illustrating the 8 Ethernet ports and the power input terminal block for connection.
3. Operating Instructions
The Hirschmann RS20-0800T1T1SDAUHH is an unmanaged switch, designed for simple plug-and-play operation.
3.1 Power On
Once the power supply is connected, the switch will power on automatically. There is no power button.
3.2 Network Connectivity
Upon connecting Ethernet devices to the switch ports, the switch will automatically establish network links. Data transmission will commence without further configuration.
3.3 LED Indicators
Observe the LED indicators on the switch for status information:
- Power LED: Indicates the power status of the device. Typically green when powered on.
- Link/Activity LEDs (per port):
- Solid Green: Indicates a successful network link.
- Flashing Green: Indicates data activity on the port.
- Off: No link detected or device is not connected.
4. Maintenance
The Hirschmann RS20-0800T1T1SDAUHH switch requires minimal maintenance.
4.1 Cleaning
- Ensure the device is powered off before cleaning.
- Use a soft, dry cloth to wipe the exterior of the switch.
- Do not use liquid cleaners or solvents, as these can damage the device.
4.2 Environmental Considerations
The switch has an IP00 rating, meaning it is not protected against dust or water ingress. It must be installed in an appropriate enclosure that provides protection from environmental factors.
5. Troubleshooting
This section provides solutions to common issues.
5.1 No Power
- Symptom: Power LED is off.
- Action:
- Check the power cable connection to the switch.
- Verify the power source is active and providing the correct voltage (24V AC / 24-48V DC).
- Inspect the power terminals for secure contact.
5.2 No Network Connectivity
- Symptom: Link/Activity LED for a port is off, or devices cannot communicate.
- Action:
- Ensure the Ethernet cable is securely connected to both the switch port and the connected device.
- Try a different Ethernet cable.
- Verify the connected device is powered on and functioning correctly.
- Try connecting the device to a different port on the switch.
6. Specifications
Technical specifications for the Hirschmann RS20-0800T1T1SDAUHH Ethernet Rail Switch.
| Feature | Specification |
|---|---|
| Model Number | RS20-0800T1T1SDAUHH |
| Brand | Hirschmann |
| Switch Type | Unmanaged Fast Ethernet Switch |
| Number of Ports | 8 |
| Mounting Type | DIN Rail |
| Operating Voltage | 24V AC / 24-48V DC |
| Connectivity Protocol | Ethernet |
| Product Dimensions (L x W x H) | 0.31 x 0.31 x 0.28 inches |
| Weight | 5.67 Pounds |
| International Protection Rating | IP00 |
| Contact Material | Copper |
| Date First Available | May 11, 2018 |

Figure 3: Product label for the Hirschmann RS20-0800T1T1SDAUHH, displaying key identification numbers such as UPC 4002044252977 and Alt ID 943 434-999.
7. Warranty and Support
7.1 Warranty Information
For specific warranty details regarding your Hirschmann RS20-0800T1T1SDAUHH switch, please refer to the warranty documentation provided with your purchase or contact Hirschmann directly. Warranty terms typically cover manufacturing defects for a specified period from the date of purchase.
7.2 Technical Support
If you encounter issues that cannot be resolved using the troubleshooting guide, or require further technical assistance, please contact Hirschmann customer support or your authorized distributor. Have your product model number (RS20-0800T1T1SDAUHH) and serial number ready when contacting support.





