Residual current circuit breakers

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Residual current devices

Residual current devices are important elements protecting any electrical installation. As they protect directly against electric shock during direct or indirect contact, they are also called electric shock switches. They are a must-have for any home switchgear. They not only effectively protect against electric shock, but also minimize the risk of fire.

Electric shock circuit breaker: an important element of electrical installation protection

Each electric shock circuit breaker must be installed in such a way that the phase conductors and the neutral conductor pass through it. If everything is working correctly, the current in the wire is the same value as the current in the neutral wire. On the other hand, when the installation is damaged, the current escapes and may end up on the housings or the cover of electrical devices. Then the value of the current in the phase conductors and in the neutral conductor is different, and the difference of these values ​​itself is called the differential current. Residual current device, or differential , is a device designed to disconnect the installation from the power supply if a failure is detected.

Each electric shock circuit breaker consists of four elements. They are:

  1. contact of current circuits with a button that enables the device,
  2. trigger acting as a polarized relay,
  3. test circuit to check the operation of the differential,
  4. Ferranti earth fault transformer, responsible for the measurement of the leakage current.

Thanks to this structure, high protection against electric shock is guaranteed.

RCDs differ in the residual current they handle.

  1. Up to 30 mA are referred to as high-sensitivity circuit breakers. Such a differential is used where the risk of a fire resulting from damage to the electrical installation is considerable, i.e. in kitchens, bathrooms or workshops.
  2. From 30 to 500 mA, there are medium-sensitivity switches, which are used in residential buildings and on construction sites.
  3. In turn, from 500 mA onwards we refer to low-sensitivity switches used in circuits high leakage current. They are used as main circuit breakers in an electrical installation.

You should be aware that each differential is used as additional protection for the electrical installation. The most frequently used are devices with a rated differential current of 30 mA, which start at 20 mA.

Current of lower intensity allows the affected person to break away from the damaged installation, but does not always save from electric shock.

Electric shock circuit breaker: wide range of products

A product such as an electric shock switch is the basis of any electrical installation. The wide range of products in our store allows you to choose devices ideally suited to the needs of a given household. It is worth getting acquainted with the exact technical specification so that protection against electric shock is maximum. It is a good idea to check the circuit breaker once a month by using the test button to verify that it is working properly. If the accessory works immediately, it is mechanically sound. Available differentials have different values ​​of rated current, so they can be easily adapted to specific electrical installations. An important technical parameter for RCDs is the rated voltage. The rated voltage of the switch should not be less than the rated voltage of the network in which it will be installed. Also important is the rated frequency, which is 50 and / or 60 Hz for standard devices. It is these parameters that should be checked before making a purchase. The anti-shock switches can also be equipped with additional accessories, such as auxiliary contacts. They are responsible for remote signaling of circuit breaker tripping. They may also be responsible for controlling the control circuit.