NETIO PowerPDU 4C is a small 110/230V PDU (Power Distribution Unit). Each of the four IEC-320 C13 outlets can be independently controlled (On / Off / Reset / Toggle). Electrical parameters (A, W, kWh, TPF, V, Hz) are measured with high accuracy at each outlet. The device features two LAN ports (and a built-in Ethernet switch) for connecting to a LAN. Each power output supports ZCS (Zero Current Switching) to protect the connected equipment. With the NETIO Cloud service, the outputs can be controlled from anywhere. The NETIO Cloud service, provided for a fee, uses SSL security and servers in Europe.


We announce, that product NETIO PowerPDU 4C is EOL. We recommend not to use it in the new projects. Last pieces are in stock, but no further production is planned.


Replacement for PowerPDU 4C is PowerPDU 4KS – read product specifications carefully, there could be some minor differences. PowerPDU 4KS is ready in stock, orders possible immediately.


We apologize in advance for any inconvenience.


Outputs can be controlled in the device web administration, using a mobile app or over various M2M API protocols (REST API, SNMP, MQTT, Modbus/TCP and more). Custom Lua scripts can run directly in the NETIO PowerPDU 4C. As a special feature, NETIO PowerPDU 4C provides a RS-232 serial port (green 3-pin terminal block) that can be controlled with a Lua script or used as a TCP tunnel (remote serial port).


M2M API: Open interface (13 protocols)

NETIO PowerPDU 4C is a smart PDU (Power Distribution Unit). With the support for many network protocols that can be used to control each power outlet individually and measure electricity consumption, the device is unique on the market.

Thanks to many supported M2M APIs, NETIO devices are easy to integrate into existing systems that consist of HW/SW from many different producers.

For example, NETIO PowerPDU 4C supports the following M2M APIs: XML, MQTT, SNMP v3, Telnet, Modbus, JSON, ... For each open M2M protocol, a detailed specification is available the Downloads section.

>> Glossary: API protocols


Security in M2M protocols (HTTPs / SSL)

NETIO PowerPDU 4C supports a high level of network security.

  • The HTTPs protocol secures the connection between the browser and the web server. As long as HTTPs is activated, the device administration as well as M2M protocols over HTTPs (URL-APIXMLJSON) are secured with SSL encryption.
  • The third SNMP v3 generation offers a better password protection in comparison to previous SNMP versions.
  • The MQTT protocol for IoT cloud applications includes SSL security.


Usecases for NETIO PowerPDU 4C:

  • In IT, the NETIO 4C smart PDU is typically used to distribute electricity in a 19" rack (cabinet) in a data center.
  • NETIO PowerPDU 4C is frequently used in conferencing rooms and in multimedia AV applications – whenever there is a need to individually control 110/230V electrical outlets from a master system (e.g. a control panel in the meeting room).
  • Typical applications also include energy metering for equipment monitoring (3D printer, lab equipment, ...)
  • In the area of Digital signage or AV multimedia, companies often use NETIO sockets to control multimedia screens and to monitor their functionality (using power measurements). NETIO supports the publishing of drivers for most common systems in this field.
  • Remote or autonomous restarting of equipment in monitoring centers or information stands – at places that must operate 24/7 without outages (airports, shopping malls, railway dispatching centers, call centers, ...)
  • NETIO is used to monitor (watchdog & measurement) and control a couple of devices such as light controller, filter pump, flow pump, heating etc. of a larger aquarium. The start-up behavior after a power failure and alert functions are also important.

>> NETIO usage examples

Ask for a price or technical parameters

Documents to download




Power measurement

NETIO PowerPDU 4C is small PDU with power measurement and IEC-320 outputs

NETIO PowerPDU 4C measures electrical parameters separately for each output. Measured values are displayed in the web administration interface and accessible via M2M protocols. NETIO PowerPDU 4C measures with accuracy better than 1%.

  • 4x Current [A]
  • 4x Output power [W]
  • 4x Energy [Wh]
  • 4x TPF (True Power Factor)
  • Voltage [V]
  • Grid frequency [Hz]
  • Phase [-180 … 180°]

>> More about electrical measurements



This product can be connected to the NETIO Cloud service (100 outputs can be controlled from 1 web screen). NETIO Cloud is an ideal solution for remote control and restarting.
The paid NETIO Cloud service is operated by NETIO products a.s. as a support for manufactured equipment.

  • All products manufactured by NETIO products can be connected to NETIO Cloud.
  • The user can control connected devices securely via the web from anywhere (HTTPs).
  • The first 3 years are free connection to the service thanks to the "Welcome credit".
  • NETIO Cloud can be used in parallel with other Open API protocols.
  • Secure device communication to the Cloud service (port 8883 - MQTTs - TLS)
  • NETIO Cloud has its own Open API, which can be used to control all devices in a specific user account (MQTTS protocol).

>> More about NETIO Cloud service


RS-232 serial port of NETIO 4C

NETIO PowerPDU 4C smart PDU controlled via RS-232 serial port

NETIO PowerPDU 4C provides a RS-232 serial port at its 3-pin green terminal block. The serial port can be used as a remote serial port (tunnel from a TCP connection to the serial port), or controlled with Lua scripts.

Lua scripts can send strings to this serial port and read any responses. This makes it easy to connect various industrial devices in order to, for example, react to a high temperature sensed by a RS-232 sensor by switching on a particular outlet.

>> More about RS-232


Lua – Programmable scripts

PowerPDU 4C is controllable over custom Lua script

PowerPDU 4C can run custom scripts written in the Lua language. The user enters the script in the device’s web administration interface. There is no need to install any additional software. The scripts run directly in the device and do not require any cloud connection.

User Lua scripts can:

  • Switch individual power outlets on/off (AN01)
  • Send e-mails
  • Read values or send commands over RS-232 (AN18)
  • Send and receive ICMP PING requests and replies (AN09, AN24, AN25)
  • Download and parse XML files from other devices (from a given IP address) – (AN13, AN14)
  • Communicate with other IP products using SNMP and Modbus/TCP as a client – M2M Active Client
  • Work with date and time (Scheduler / Calendar) (AN07, AN17)

The Application Notes (ANxx) page contains more examples of Lua scripts as well as practical tutorials for individual functions.

>> More information about NETIO Lua


Monitoring of network devices (IP WatchDog function)

The IP WatchDog function of NETIO PowerPDU 4C monitors PING (ICMP) responses

The IP WatchDog function of NETIO PowerPDU 4C monitors PING (ICMP) responses. The monitored device (router, IP video camera, …) can be easily restarted without human intervention. The function can be configured over the web interface.

Lua extensions of the IP WatchDog

As a unique feature of NETIO products, Lua scripts can be used to write more complex conditions for monitoring other devices. For example, the correct operation of other devices (heartbeat) can be checked by parsing XML files, loading web pages, and so on.

>> Function IP Watchdog


PowerUp state

User can define output state after power restoring - PowerUp state

For some applications, it is important to set the correct state of a power output immediately after power is turned on (or restored). The “PowerUp state” parameter defines the behavior of the 110/230V outlets just after power is restored, before the standard communication with the master system is established.

  • On 
  • Off 
  • LAST state restores the last state before the power was disconnected

Delayed switch-on function ensures that the 110/230V power output is switched on with a configurable delay (several seconds) after the power is restored. This can avoid circuit breaker tripping when power is restored after an outage. 

>> PowerUp state

Built-in Ethernet switch

NETIO PowerPDU 4C includes two RJ45 ports for connecting to a LAN. The device includes a built-in (unmanaged) Ethernet switch. Several PowerPDU 4C units can be “daisy-chain” connected to a single RJ45 LAN socket; each PowerPDU 4C will have its own IP address. 


ZCS (Zero Current Switching)

An important feature of NETIO PowerPDU 4C is ZCS (Zero Current Switching). ZCS means that the control relay switches the IEC-320 C13 output power outlet on or off when the current crosses the zero level.

  • Thanks to ZCS, the device can control switching power supplies (servers, computers and other IT equipment) up to the maximum rated power.
  • Using ZCS (Zero Current Switching) to switch on the outputs reduces the chance of a circuit breaker tripping when power is restored after an outage.
  • Since the relay switches when the sinusoidal current curve crosses the zero level, negative effects of inrush current are significantly reduced.
  • ZCS significantly reduces EMC interference generated by connecting and disconnecting 230V appliances.
  • In the long term, ZCS reduces PowerPDU 4C failures due to internal relay damage.
  • ZCS extends the lifetime of connected equipment; especially in case of frequent on/off switching of devices that are not designed for that (such as switching power supplies).
  • When a load is switched several times per day, ZCS puts less stress on the connected equipment and saves maintenance costs (power supply replacements for frequently switched equipment).

>> More about ZCS


IOC (Independent Output Control)

NETIO PowerPDU 4C can be used for professional applications, such as powering servers. With servers in particular it is important to avoid momentary power switch-on or switch-off.

Output control is therefore completely independent from the LAN communication subsystem. The on/off status of an output outlet is not affected by any LAN disconnection, internal device reboot or firmware upgrade.

>> IOC (Independent power control)


Scheduler (timed switching of individual outlets)

The switching of outlets can be time-controlled by the Scheduler with a graphical interface. Switching on/off at specific times can be easily configured.

  • Each output can have its own schedule, according which the output is switched
  • While Scheduler (calendar) is running, the output can be controlled from NETIO Cloud, web interface or Open API
  • The Scheduler does not require an internet connection (requires a time source – NTP server – for example a local ADSL / WiFi router)


For more detailed settings, extensions of the Scheduler function using Lua scripts are also possible (AN07, AN17).

>> More information about Scheduler


Mobile app controlled power socketsMobile application

This device can controlled from mobile App NETIO Mobile 2 (Android & iOS).

  • LAN: NETIO Mobile 2 can control all outputs of devices within local LAN (WiFi).
  • Cloud: User account on the NETIO Cloud service can be connected to the mobile app.

You can do with mobile app

  • Control individual power outputs – switch ON, switch OFF, RESET
  • Read power consumption data (A, W, Wh), if this one output (device) supports energy metering
  • QR code for NETIO Mobile 2 AndroidQR code for NETIO Mobile 2 iOSActivate / deactivate the week Scheduler function per each output
  • Sorting of outputs within groups (by function or location)
  • Output grouping – default group per one device can be changed individualy
  • Group control - Switch the whole group of outputs On / Off
  • Group control - Activate / deactivate the week Scheduler function for each output in whole group
  • Change output / device name (visible in the mobile application only)
  • Add multiple devices to the mobile app.
  • LAN discover: Search your LAN/Wifi network for NETIO devices.


>> NETIO Mobile 2


General properties

LAN Web NETIO Cloud Lua scripts WatchDog Scheduler Mobile App Open API 19“ 1U
PowerPDU 4C 4xC13 4 2 Yes Yes Yes Ping Yes iOS + Android 15 protocols RM1 / RM2 
PowerPDU 4PS 4xC13 - 1 Yes Yes - Ping Yes iOS Android 10 protocols RM1 / RM2 
PowerPDU 4KS 4xC13 - 1 Yes Yes - Ping + Power Yes iOS Android 10 protocols RM1 / RM2 
PowerPDU 8QS 8xC13 2 1 Yes Yes - Ping + Power Yes iOS Android 10 protocols Yes ZVS




Open API interface

Unique features of PowerPDU 4C

  • Built-in Ethernet switch
  • No momentary output switching even during FW upgrade
  • Lua scripts running directly in the device
  • Scheduler function with a graphical interface
  • IP WatchDog function
  • Support for measurements with external sensors
  • Support for reading from / writing values to UPC using SNMP 


Technical specifications

Power ratings

  • Supply voltage: 110/230 VAC / Max 10A
  • Low internal consumption: 2 to 5 W
  • Surge protection: Yes
    • Max energy 125J
    • Maximum applied voltage  300Vrms
    • Max. peak current  20/80us  4500A
    • Max. clamping voltage 775V

Power outputs

Power measurement

  • 4x Current [A]
  • 4x Consumption [kWh]
  • 4x Output power [W]
  • 4x TPF (True Power Factor)
  • Frequency [Hz]
  • Voltage [V]
  • Phase [-180° to 180°]
  • Accuracy:  better than 1% (25°C)


  • 2x LAN 10/100 Mbps (RJ-45)
  • Built-in unmanaged Ethernet switch
  • RS-232 serial port (3 pins: Rx, Tx, GND)
  • USB: Only as a 5V / 1A supply output
  • Mobile app: NETIO Mobile 2 (Android & iOS)
  • FW upgrade over the Web interface: Yes


  •  Cloud connection needed for installation: No
  •  Service: NETIO Cloud (paid service, secured by TLS)


  • Main power switch
  • 4x button for individual sockets
  • LED indication of current outlet states
  • Sound indication: Yes

Open M2M API


Lua Active Client protocols:

  • Lua PING request  (AN09, AN24, AN25)
  • Lua XML over HTTP get (AN13, AN14)
  • Lua URL API over HTTP get (AN06)
  • Lua SNMP v1 (AN16)
  • Lua MQTT (AN35)
  • Lua RS-232 (Serial port) (AN18)


Build-in functions

Lua scripting

Operating conditions

  • Temperature: -20°C to +65°C
  • For indoor use only (IP30)

Package contents

  • NETIO PowerPDU 4C
  • QIG (printed Quick Installation Guide)
  • Power cable (Europlug C13 by default)


  • Warranty: 24 months
  • NETIO PowerPDU 4C: 220 x 40 x 120 (w x h x d)
  • Cable length: 1m
  • Weight: 0.8 Kg
  • Package: 255 x 73 x 204 mm (w x h x d)
  • Standards:
    • EN 61010-1 ed.2:2011
    • EN 61326-1 ed.2:2013
    • EN 55011 ed.3:2010
  • Designed and made in the Czech Republic


M2M API Interface

The NETIO PowerPDU 4C smart PDU devices support open API protocols for controlling outputs and measuring parameters.


A simple system for switching individual outlets on/off by accessing a URL. A REST-type protocol. 

SNMP (v1 / v3)

IT and Telco infrastructure management protocol. SNMP v3 is well-secured. 


Text files in XML format transferred over HTTP or secure HTTPs. A REST-type protocol. Bidirectional communication (http GET/POST).


Simple industrial M2M protocol for controlling NETIO 4x smart socket devices from various PLCs, SCADA systems etc. 


Text files in JSON format transferred over HTTP or secure HTTPs. A REST-type protocol. Bidirectional communication (http GET/POST).

MQTT (generic / MS Azure)

Protocol for IoT (Internet of Things) cloud applications, with SSL security. The smart sockets device maintains a connection to the cloud application that can control it. 

Telnet (ssl)

Simple command-based protocol over a TCP connection.  The communication can be secured using SSL. This protocol is backwards-compatible with NETIO-230B (Kshell).

SIP (VoIP aplikace)

Telephony protocol; individual outlets can be controlled using an IP telephone in a way similar to opening doors.

>> M2M API interface


Expand all

I have just unpacked the NETIO PowerPDU 4C unit, how do I configure it?

For the up-to-date procedure, please refer to the QIG (Quick Installation Guide) enclosed in the package.
Connect NETIO PowerPDU 4C to the Ethernet (LAN) and run the “NETIO Discover” utility (Windows or Java version). NETIO Discover finds the device and displays its IP address. When the IP address is clicked, the product web interface opens. The default login/password to access the device configuration is “admin”/“admin”.


I forgot my password. How do I reset NETIO PowerPDU 4C to factory defaults?

For the up-to-date procedure, see the product manual – look for “Forgotten password”. To restore factory defaults:
“To restore factory defaults, press and hold the buttons for outlets 1 and 2 and turn on the device. Keep the buttons pressed until the device beeps 3 times. While restoring factory defaults, all LEDs for the outlets flash red. As soon as the reset is finished, the device beeps twice.“

What does NETIO 4x mean?

NETIO 4x is the overall designation of NETIO 4 / 4C / 4All products.

What is a “tunnel” to the serial port?

In the settings, the 3-pin serial port can be connected to a specified TCP port. Then, on a computer, a Telnet connection to an IP:port can be established, and whatever you type into the terminal will be sent to the physical serial port. RS-232 speed and other parameters are configured in the WEB configuration interface of NETIO PowerPDU 4C.

How to mount NETIO PowerPDU 4C into a 19" rack?

NETIO provides a complete range of rack brackets.

What is the purpose of the USB connector at the PowerPDU 4C front panel?

This connector is for factory configuration only. The USB port can be used as a 5V / 1A supply to power RS-232 devices.

PowerPDU is without a load (no appliances connected to the outlets) but the web interface still shows 0.01 or 0.02 A.

This is correct, a small load may be drawn by the protective snubber at each output. This protection consumes about 2Wh / day.

Is NETIO PowerPDU 4C a smart PDU or a smart socket device?

The distinction is not entirely clear-cut but in general, PDUs are intended for 19" racks.  Also, the IEC 60320 C13 /C14 connectors are typical for the IT world.

Products with the wall-type 230V sockets (Type F (Schuko), Type E, ..) are usually called „smart sockets“.

Is it possible to control NETIO PowerPDU 4x outlets from a mobile app?

Yes, use the NETIO Mobile app. The mobile phone and all connected devices must be in the same network (mobile phone connected via WiFi). The app supports NETIO 4 / 4C / 4All and can control several smart socket devices. 

Can NETIO PowerPDU 4C switch an output on or off at a specified time?

Yes, the on/off timing of individual outputs can be configured in the “Scheduler” graphical interface.

Another option is to write a Lua script (AN07 or AN17) to switch the electrical outputs at specified dates and times.

Is it possible to control NETIO using an IoT cloud?

Yes, NETIO 4x (4 / 4All / 4C) supports the MQTT protocol (generic MQTT / MS Azure – IOT central) for connecting to IoT (Internet of Things) cloud applications.

Does NETIO 4x support daylight savings time?

Yes, all NETIO 4x products contain a Scheduler that switches the outputs on and off at the times specified in hours and minutes. The time is synchronized automatically according to the selected timezone. Daylight savings time is set automatically and cannot be disabled.

Is it possible to switch on/off a PowerPDU 4C output with a command over the RS-232 serial port?

Yes, but only with a Lua script. For an example, see “AN18 Lua access to RS-232 serial port”. The AN contains sample command formats; however, you can also define your own commands to switch each output on or off.

What is the difference between PowerPDU 4C and 4PS?

The 4PS model is simpler. It is intended for basic applications that require remote switching of power outputs.

PowerPDU 4PS does not support electrical measurements, RS-232 or Lua scripts. PowerPDU 4PS does not have buttons for direct control of the power outputs, and only has one RJ45 jack to connect to a LAN. 

What is the difference between MQTT and MQTT-flex?

MQTT-flex is a NETIO extension of the standard MQTT protocol. The extension uses a configuration text file to specify the MQTT message structure, the MQTT broker address where messages are sent, and the periodicity. In this way, a complete configuration of the MQTT communication can be transferred in a single text file.



Photo and video

Product comparison

  Connection Switched
Inputs NFC Web


Mobile App HTTPs Open APIs
2xLAN 4xC13 4 ZCS RS-232 - Yes Yes Lua scripts Ping Yes iOS

15 protocols

LAN 4xC13 - ZVS - - Yes Yes Condition
& Rules
Ping Yes iOS 
- 10 protocols
LAN 4xC13 4 ZCS 1xDI (S0) - Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols
PowerPDU 8QS LAN 8xC13 1+1 ZVS 1xDI (S0) - Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols
PowerPDU 8KS LAN 8xC13 8 ZCS 1xDI (S0) - Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols
2+2 2 ZCS / - 2xDI
- Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols
PowerBOX 3Px LAN 3x - ZVS - - Yes Yes Condition
​& Rules
Ping Yes iOS 
- 10 protocols
PowerBOX 4Kx LAN 4x 4 ZCS - - Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols
PowerBOX 4Kx WiFi


4x 4 ZCS - - Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols
PowerCable REST WiFi 1x 1 ZCS - Yes Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols
PowerCable 2PZ LAN
2x - ZVS - - Yes Yes Condition
​& Rules
Ping Yes iOS 
- 10 protocols
PowerCable 2KZ LAN
2x 2 ZCS 2xDI
- Yes Yes Condition
​& Rules
Ping + Power Yes iOS 
- 10 protocols



Available models

PowerPDU 4C CH
LAN PDU (Power Distribution Unit) rated at 110/230V, energy metering, 4x IEC-320 C13 power output. 2x LAN interface, RS-232. Swiss power cable.
PowerPDU 4C Europlug
LAN PDU (Power Distribution Unit) rated at 110/230V, energy metering, 4x IEC-320 C13 power output. 2x LAN interface, RS-232. Europlug power cable.
PowerPDU 4C UK
LAN PDU (Power Distribution Unit) rated at 110/230V, energy metering, 4x IEC-320 C13 power output. 2x LAN interface, RS-232. UK power cable.
NETIO 4C can be installed with the 110/230V supply connectors at the front or at the back

Metal brackets to install one NETIO PowerPDU device into a 1U space in a 19” rack frame.

Metal brackets to install two NETIO 4C devices into a 1U space in a 19” rack frame.

Metal brackets to install two NETIO PowerPDU devices into a 1U space in a 19” rack frame.

Metal brackets to fasten one NETIO 4C device to a vertical bar in a rack frame.
NETIO RM3 4C vertical

Metal brackets to fasten one NETIO PowerPDU device to a vertical bar in a rack frame.

Universal metal brackets to fasten one NETIO 4C device e.g. to horizontal bars in a rack frame.
NETIO RM4 4C universal

Universal metal brackets to fasten one NETIO PowerPDU device e.g. to horizontal bars in a rack frame.

PWR adapter UNI to IEC-320

Adapter connecting many types of electrical plugs to NETIO 230C/CS. EU, UK, U.S., AU, Schuko , Switzerland and Italy plugs may be used. 

NETIO smart power sockets


Lan ports: 
LAN ethernet switch: 
WiFi AP mode: 
Blue Tooth 4.0 LE: 
Serial port (RS-232): 
SMS Alerts: 
Email alerts: 
Mobile App: 
Scheduler (Chytrý kalendář): 
IP Watchdog Hearbeat): 
Warranty 2: 
6 Months
Protection 2: 
Rack montage: 
Product dimensions: 
340 x 58 x 90 mm
Product weight: 
1,18 Kg
Shipping package: 
420 x 65 x 130 / 1350 g
SNMP v1: 
SNMP v3: 
User certificates: 
MS Azure (MQTT): 
Power Output: 
4x DE (Type F - Schuko)
Power Input: 
230V AC
Power Output sockets: 
Power Input: 
Europlug - cable 1m
Power In max current: 
Max one socket current: 
Power fuse: 
External, mechanical
Current meter: 
Metered values: 
Energy meter: 
XML interface accessible in LUA: 
SNMP interface accessible in LUA: 
Web buttons accessible in LUA: 
CGI interface accessible in LUA: 
PING interface accessible in LUA: 
RS-232 accessible in LUA: 
Online demo IP address:
Show download for mobile: 

Ask for a price or technical parameters

For device testing use name/password demo/demo