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In the category of products belonging to electrotechnical modular equipment, you will find differential-current switches, called RCDs (from the English Residual Current Device) or simply differentials. It is enough to visit the site https://stroysklad.com.ua/automatic-m.html where electrotechnical equipment is presented.
Technical specifications
The limit switch is an extremely important electrical protection device. His task is to turn off the circuit when he finds that the electric current flowing from it is not equal to the current returning to it (which also regulates Kirchhoff's law). Nevertheless, it is worth remembering that the final current switch: this is an additional protection along with the automatic power cut-off, which works in the event of a direct short circuit between the phase and the case.
Nevertheless, the final current switch protects people from electric shock by means of contact (indirect and direct), and also minimizes the consequences of damage to electrical equipment, as well as the possibility of fire. It is mounted in TN-S and TN-CS network systems, on the site with separated protective conductors PE and neutral N. In addition, RCDs are used in TT networks, rarely in IT.
How to choose a differential switch - types, models and application
When choosing a differential switch, pay special attention to the sensitivity and different types of detectable leakage currents.
For a household, choose a highly sensitive device that reacts to a differential current with a height not exceeding 0,3 mA. Choose the number of poles accordingly. The classic automatic switch is capable of interrupting all active wires (L1, L2, L3, N), so on the market you will find automatic switches:
- bipolar (in single-phase circuits - single-phase differentiation),
- four-pole (in three-phase circuits with a neutral conductor),
- three-pole (in three-phase circuits without a neutral conductor).
A single-phase differential will work in a typical 230 V installation. This is a widely used solution in residential, office and other buildings where electricity is used to power lighting, sockets and standard household appliances. The equipment has impressive performance characteristics.
