Your first step to avoid residual currents

Residual currents caused by the failure of insulation can constitute a significant risk to safety in electrical systems. Using an appropriate protective concept it is possible to detect residual currents, eliminate insulation faults in good time and therefore ensure the availability of the system.

RCM stands for Residual Current Monitoring and means the monitoring of residual currents in electrical systems. This current is calculated as the sum of the currents of all conductors, apart from the protective earth (PE), which feed into the system. Residual currents are typically the result of insulation faults, leakage currents or EMC filter leakage currents for example.


Your benefits at a glance

Detection and reporting of residual currents in a timely manner

Detection and reporting of residual currents in a timely manner

through the use of residual current measuring devices

Timely and preventative maintenance

Timely and preventative maintenance

through the information additionally gained from an RCM measuring device

Continuous indication of actual value

Continuous indication of actual value

RCM devices record the long-term development and report the exceeding of critical value

The fundamental RCM measuring process

The fundamental RCM measuring process

RCM measuring is based on the differential current principle. This requires guiding all phases (without PE) through a residual current transformer at the measuring point - the outlet to be protected. If there is no failure in the system, the sum of all currents will be nil. If, however, a residual current is flowing to ground, the current difference causes an evaluation by the electronics in the RCM measuring device.

Typical applications

RCM measuring instruments are mainly used in systems where a high level of availability is required, such as:

• Data processing centres, production and telecommunications facilities, hospitals, etc.

• TN-S systems with strict EMC requirements

• Equipment at risk of fire

• Equipment in cleanroom conditions

• Research facilities, laboratory technology areas

Errors that are detectable by a RCM measurement

• Insulation faults of lines and electrical operating resources

• Residual currents from electrical loads

• Defective PP power capacitors for the PFC

• Defective components in switched mode power supplies e.g. in computers

• Correctness of TNS systems (Terra Neutral Separate)

• Disclosure of impermissible PEN connections

• Avoidance of neutral conductor reverse currents to grounded equipment

These measuring instruments support RCM measurement

Energy Analyzer 750

Energy Analyzer 750

Energy Analyzer 750

Our Energy Analyser 750 facilitates the comprehensive monitoring of specific parameters of voltage quality, and supports compliance with all required standards.

Energy Analyzer 550

Energy Analyzer 550

Energy Analyzer 550

The Energy Analyzer 550 measures all quality parameters of the electrical supply network: from the characteristics of the symmetry to the transients - and many more parameters.

Energy Meter 700-PN

Energy Meter 700-PN

Energy Meter 700-PN

The Energy Meter 700-PN has two PROFINET-compliant Ethernet interfaces and an integrated switch for establishing line topologies.

Energy Meter 750

Energy Meter 750

Energy Meter 750

The capabilities it offers allow comprehensive error detection, because in addition to continuously recording consumption it also monitors residual currents.

Perfect complementation

Benefit from Weidmüller services and market experience

Orange Selection

Orange Selection

Products of the Orange Selection are available at any time. If your order is received by 3 p.m., your items will already be on their way the following day.

Time-saving data provision

Time-saving data provision

CAD 3D models in various formats and CAE data are available for download in our product catalogue.

Electronic product data for distribution partners

Electronic product data for distribution partners

Electronic catalogue in BMECat and other formats. Fast access to article data thanks to proven standards.

Market and industry experience

Market and industry experience

We speak the language of our customers. With expertise and passion for the automotive and transmission & distribution industry.

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