Protective relays for reliable mains protection

Protective relays

Our comprehensive portfolio of protection technology enables reliable grid availability in the voltage ranges of 10 kV to 110 kV. The protective and control devices can be used in, for example, single and double busbar applications, as well as radial, looped, and meshed grids. They can also be used in insulated, compensated, rigid, and low-resistance grounded grids.

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Protective relays for reliable mains protection

Your advantages at a glance Digital protective relays for intelligent mains protection

  • Large functional scope with protection, control, and measurement functions in a compact design
  • Intuitive operation with clearly laid-out front panel and simple configuration options
  • Long service life with battery-free design and extremely low power consumption
  • Satisfies IT security requirements in accordance with the BDEW white paper

Our protection technology at a glance Protect, monitor, and control electrical grids

Protective relay on front panel
Man during commissioning with the DIGICOM operating software in a control center
Open control box with protective relay
Protective relay on front panel

The front panels of the protective relays offer numerous options for interaction and for visualizing the current states.
The displays can be configured as needed and offer sufficient space to show system graphics, tables of measured value, and virtual LEDs.
Numerous navigation and operating keys allow easy control on site. The USB service interface on the front enables easy connection to the protective relay.

Man during commissioning with the DIGICOM operating software in a control center

The operating software makes device configuration quick and easy. For example, during step-by-step commissioning, dependencies between entered settings are taken into account and grayed out.
In addition to the general device settings, the interfaces to the primary technology and the protective functions are also configured.
In addition to I/O matrices, editors for creating the logic and visualization also provide support during the configuration.
Direct communication to a control system or a higher-level control engineering system is possible via various communication options.

Open control box with protective relay

With our comprehensive service portfolio, we help you digitalize and optimally adapt and expand your grids. By using highly available and technically mature products and solutions, we optimize the reliability of the supply. We provide you support from the planning phase through to implementation.

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Test the software without obligation
The DIGICOM operating and fault analysis program helps users configure all the protective relays, for example, via the USB interface on the front panel, and document the configuration files. A comprehensive measurement center allows grid faults to be saved, read out, analyzed, and evaluated graphically. The protective relays can also be updated and upgraded using the operating software.
Download the software free of charge
Man in a control center with DIGICOM software on screens

Which protective relay is right for me?

Protective relays of the KOMBISAVE+ product family on a wall

Intelligent mains protection with KOMBISAVE+

The protective relays of the KOMBISAVE+ product family are perfectly suited for use in the distribution grid. Motors, transformers, cables, and lines can be protected in switching devices with single or double busbars.
The devices include a large range of functions, from overcurrent protection through to QU protection, distance protection and line differential protection, synchro check, and automatic reconnection.

Transformer current-supplied mains protection with POWERSAVE

Transformer current-supplied mains protection with POWERSAVE

POWERSAVE is a compact and powerful protective relay with a
full range of protection, control, and measurement functions. With the optional integrated power management for direct triggering of the circuit breaker, the device solution is independent of the external power supply.

The combination of energy management and distance protection functions makes the protective relay indispensable as blackout protection.

Direct comparison of the protective relays

In just a few steps, identify the right system for you for reliable protection technology.



Protective function
Overcurrent and motor protection
Feeder protection with distance protection, ground fault detection, and field control
Transformer differential protection with field control -
Line differential protection with distance protection, ground fault detection, and field control -
Device properties
Integrated power management (energy storage, converter power supply) -
Maximum number of current/voltage/sensor inputs 8/5/0 4/3/3
Freely configurable function keys/indicators 4/0 3/2
Maximum number of binary inputs and outputs 22/23 8/8
Further information
Our protective relays in detail
Further details such as technical data of the protective relays and information on the operating and fault analysis software is available in the brochure.
View the brochure now
Employee with laptop using the operating and error analysis software