Doepke e.Guard is a modular system for the continuous monitoring of residual currents (earth leakage currents) in electrical installations. It enables ongoing condition monitoring, supports predictive maintenance, and can be used as an alternative measure to periodic insulation testing in final circuits. The system is divided into five successive performance levels, each offering different functions and degrees of expansion depending on requirements: Level 1 – basic: Entry-level solution with local software for visualising and storing residual currents. Enables continuous monitoring and simple alarm notification; Level 2 – expertise: Extended with the e.Guard gateway. Data is stored without the need for a separate PC and can be accessed via a web browser. Provides convenient monitoring and alarm management; Level 3 – cloud: Cloud-based solution with location-independent access to data and audit-proof storage. Ideal for central monitoring of multiple installations; Level 4 – advance: Uses machine learning to analyse residual current patterns. Detects anomalies at an early stage and enables predictive maintenance; Level 5 – excellence: Customised end-to-end solution for complex installations. Includes advanced data integration, tailored algorithms, and integration into higher-level systems.

The system is used for the early detection of insulation faults, gradual leakage currents, and critical system conditions—particularly in industrial, commercial, and safety-critical installations.

For low-voltage installations in industry, commerce, infrastructure, data centres, agriculture, hospitals, and larger building complexes.

No. e.Guard does not replace RCDs (RCCBs); it complements them through continuous monitoring and data analysis.

e.Guard continuously measures residual currents and analyses their progression over time.

By means of trend analysis and intelligent evaluation of measurement data, increasing leakage currents can be identified at an early stage—before protective devices trip.

Measured values are stored and visualised locally in the software (Level 1), on the gateway (Level 2), and optionally in a cloud solution (from Level 3 onwards).

Yes. Through data analysis and pattern recognition, maintenance measures can be planned in a targeted manner before failures occur.

Alarms can be issued locally, via network, or through connected systems (e.g. building management systems). Notification via email is also possible.

The system consists of residual current monitors, a gateway, and software for analysis. Depending on the selected level, the components may vary: for example, level 1 operates without a gateway and uses locally installed software, whereas from level 2 onwards a gateway is used on which the software is run.

The gateway is the central communication unit. It collects measurement data from the connected residual current monitors and makes it available for visualisation and analysis. The e.Guard gateway also provides the interface to the cloud.

Yes. Additional monitors and measuring points can be added as required.

The number depends on the hardware used and the system configuration level. Up to 20 residual current monitors can be evaluated per e.Guard gateway; from level 3 onwards, the capacity increases to up to 40 residual current monitors. By increasing the number of gateways, larger installations with many residual current monitors can also be monitored.

Under certain conditions, permanent residual current monitoring in accordance with DIN VDE 0105-100 can replace periodic insulation testing. However, the specific implementation should be coordinated with a qualified specialist.

e.Guard is designed for use in accordance with applicable electrical standards. Installation must be carried out by qualified personnel.

Installation is carried out by qualified electricians. Existing installations can generally be retrofitted, as only residual current transformers need to be added.

Yes. The system can be integrated into existing management or control systems via standard interfaces (Modbus TCP).

No. The system can also be operated entirely locally.

• Early fault detection • Reduction of unplanned downtime • Increased system availability • Support for maintenance planning • Transparent documentation

Yes, particularly in installations with high downtime costs. Even a single avoided downtime can justify the investment.

Industrial production, data centres, logistics centres, agriculture, critical infrastructure, and hospitals.

Operating costs depend on system size, maintenance model, and, if applicable, cloud usage.

Yes. The hardware is designed for continuous operation. However, software updates must be carried out individually on each device.

Depending on the application, including: DIN VDE 0100 (erection of low-voltage installations), DIN VDE 0105-100 (operation of electrical installations), DIN EN 62020 (RCM – residual current monitoring devices). The specific system design must be assessed on a project-specific basis.

In general, the following should be monitored: Outgoing circuits with high availability requirements, Circuits with loads influenced by frequency converters or power electronics, Installations with increased fire load or critical infrastructure, Main and sub-distribution boards for condition-based maintenance. A risk assessment of the installation is recommended.

The selection depends on: Conductor cross-section or outer diameter, Rated current of the circuit, Expected leakage current spectrum (type A or F depending on the application), Available installation space in the switch cabinet. Important: The transformer must encompass all active conductors (L1, L2, L3, N (if present)) together.

Residual current monitoring using RCM is only possible in a TN-S system (5-conductor system). If the equipment to be monitored (e.g. frequency converters) does not require a neutral conductor connection, only the three line conductors are routed through the residual current monitor.

The monitors are installed: • Downstream of the protective device (e.g. MCB or RCD), • As close as possible to the outgoing circuit , • Without mechanical stress and without compressing the conductors. Installation directly on the rail system is also possible, provided that all active conductors are routed together

No. The protective conductor must not be routed through the monitor. Only the active conductors are measured.

In the case of parallel conductors, all parallel active conductors must be routed together through the same transformer in order to avoid measurement errors.

The monitors require a separate supply voltage (depending on the version, e.g. 24 V DC or PoE). A stable and protected auxiliary power supply must be provided.

Je nach Ausführung: • Ethernet (z. B. PoE-fähig), • Anbindung an das Gateway, • optionale Cloud- oder Serveranbindung. Es wird empfohlen, das System in ein separates VLAN oder ein gesichertes Anlagennetz einzubinden.

The system supports static IPv4 addressing as well as DHCP. A fixed IP address assignment is always recommended.

Depending on the system configuration level, interfaces for higher-level systems are available (e.g. Modbus TCP).

The system requires the following ports to be enabled: 2002, 2003 (UDP).

1. Mechanical inspection of the monitor installation, 2. Verification of correct conductor routing, 3. Activation of the power supply, 4. Establishment of the network connection, 5. Registration of devices in the gateway, 6. Configuration of measurement channels, 7. Definition of alarm thresholds, 8. Functional test by simulating an increase in residual current.

Yes. Alarm and pre-warning thresholds are defined on a project-specific basis. Typically, the following are defined: • Pre-warning in the event of an increasing trend • Main alarm when a critical residual current value is reached

The devices are factory-calibrated. Recalibration is not required. However, regular functional testing as part of system maintenance is recommended.

In installations with frequency converters, PV inverters or charging infrastructure, the following may occur: High-frequency leakage currents, Smooth DC residual currents or Mixed frequencies. Selecting a suitable monitor type (e.g. type B) is essential.

Incorrect measurements may occur due to: separate routing of active conductors, incomplete conductor detection or inductive coupling. Proper wiring is essential.

In many cases, yes—provided that the conductors are accessible. Work must only be carried out in compliance with the five safety rules.

For the installation of the transformers, generally yes.

Measurement data is recorded continuously and stored locally for one year. Access is provided via the gateway or the software, depending on the system version. When using the cloud, the data is also available independently of location and over a longer period. In addition, measurement values can be documented and analysed in the form of PDF reports.

Continuous residual current monitoring can, under certain conditions, support or supplement periodic inspections in accordance with DIN VDE 0105-100. The decision lies with the person responsible for the installation.