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
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:
- contact of current circuits with a button that enables the device,
- trigger acting as a polarized relay,
- test circuit to check the operation of the differential,
- Ferranti earth fault transformer, responsible for the measurement of
the leakage current.
Thanks to this structure, high protection against electric shock is
RCDs differ in the residual current they handle.
- 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.
- From 30 to 500 mA, there are medium-sensitivity switches, which are
used in residential buildings and on construction sites.
- 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
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.