The Teltonika 4-PIN Power Adapter with I/O Access (PR5MEC21) is a tool made for Teltonika networking devices that use a 4-pin power connector. It helps you give power to the device and also lets you use the Input/Output connections through a screw terminal block.
This adapter is especially helpful for networking, IoT, remote monitoring, automation, and vehicle connectivity projects where you need both a steady power source and I/O access.
Key Specifications
- Brand Teltonika Networks
- Product Name 4-PIN Power Adapter with I/O Access
- Order Code PR5MEC21
- Input Connector 4-pin 3 mm pitch, 4-way screw terminal block
- Output Connector 4-pin 3 mm pitch
- Cable 4 × 0.20 mm² (24 AWG) 100 mm
- Conductor Size – Solid/Flexible 0.14–0.50 mm² (20–26 AWG)
- with Ferrule 0.25–0.30 mm² (22–23 AWG)
- Pin 1 Power +
- Pin 2 Ground –
- Pin 3 Input/Output
- Pin 4 Input/Output
- Screwdriver Type: Micro slotted
- Weight 15 g
Specifications are based on information from Teltonika Networks.
Main Features
- 4-pin power connection for Teltonika networking devices that’re compatible.
- I/O access using the adapter makes it easier to handle device connections.
- 4-Way screw block for simple wiring.
- 100 Mm cable with 4 × 0.20 mm² (24 AWG) wires.
- Works with flexible wires from 0.14 to 0.50 mm².
- Small and light design that weighs 15 grams.
- Made as a part for Teltonika Networks products that are compatible.
How Does the 4-PIN Power Adapter Work?
The adapter makes a link between a Teltonika device that works with it and other wires.
The first pin sends the power, and the second pin connects to ground. The other two pins allow access to the Input/Output connections depending on the Teltonika device being used.
This is helpful when an installation needs more than power. For example, Teltonika’s documentation shows the adapter used to get I/O access while powering a networking device in an ignition detection setup.
Where Can You Use It?
The Teltonika PR5MEC21 can be helpful in projects like:
- Industrial networking
- Industrial IoT (IIoT)
- Remote equipment monitoring
- Vehicle and fleet connectivity
- Ignition detection setups
- Automation systems
- Remote monitoring systems
- Machine and equipment connections
- Telematics setups
- IoT gateway setups
For vehicle projects, Teltonika shows an ignition detection setup where the 4-pin connector gives power and I/O access.
Compatible Teltonika Devices
The PR5MEC21 is listed as an accessory for many Teltonika networking devices, including models like the RUT240, RUT951, RUT956, and RUTM30, among others. You should check the device model before buying to make sure it works.
Why Do You Need the Teltonika PR5MEC21?
If your Teltonika router or networking device needs a 4-pin power connection and you also want to use its I/O, the PR5MEC21 offers a way to handle both with one small tool.
By using separate wiring, the adapter gives installers a single point for power and I/O, making industrial IoT, vehicle, and automation projects easier to connect and manage.

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