Residual Current Relay

Residual current relay is a device that detects the leakage currents that occur during the operation of the electrical circuit and thus prevents the negative consequences that may arise. Leakage currents leaking from the electrical circuit can cause problems such as fire, electric shock, relays are therefore very important devices.

Residual current relay is a type of circuit breaker that is automatically activated in case of leakage current in electrical systems. Leakage current is dangerous for both people and devices. Relays, which are a precaution against leakage current, cut the circuit and the power supply to the load when they detect such a situation. This device is used to prevent damage to people or equipment.

What is Residual Current Relay?

These devices have an electromechanical or electronic structure. Basically, it is used to prevent electricity leakage.

Residual current relays help prevent electrical accidents and hazards. They reduce the risk of electric shock, prevent fire hazards and ensure human safety. They also support the safe and efficient operation of electrical systems. Therefore, it has a critical importance in terms of electrical safety.

Where is a residual current relay used?

  • In homes and residences, to reduce the risk of electric shock and prevent fire hazard,
  • In industrial plants, for worker safety and machine protection,
  • For the safe operation of temporary installations at construction sites,
  • To ensure the safe use of sensitive devices in healthcare organizations.
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Residual Current Relay Working Principle

The main purpose of residual current relays is to detect electrical leakage and to cut off the energy in the circuit in these cases. It is similar to an automatic fuse in terms of appearance and is generally used side by side in the installation. In terms of function, it does not have the same tasks as an automatic fuse. There are different types of residual current relays suitable for use in different areas.a

  • Constant Current Type (AC/DC): Constant current relays detect leakage currents above a certain current threshold. They are available in different types for use in alternating current (AC) or direct current (DC) circuits.
  • Timed: These relays detect leakage currents above a certain current threshold within a certain time interval. These types of relays are useful to avoid unnecessary circuit breaks by taking into account short-term high current changes.
  • Electronic Type Relays: These are more advanced relays that can quickly detect current changes using microcontrollers and sensitive sensors. They can offer very precise sensing and faster response times.

In addition to these, there are also adjustable, breakwater type, portable, etc. current relay types.

The working principle of these devices is as follows;

  • The device detects the imbalance between phase and neutral currents in the circuit. The currents entering and leaving a device are expected to be equal. If this imbalance exceeds a certain threshold, the leakage relay automatically breaks the circuit.
  • It compares the currents using two coils or transformers placed at the input and output of the device. If there is a difference between the currents, this may indicate the presence of leakage current.
  • The device detects leakage currents within a certain time interval or above a certain current threshold. These time settings are used to prevent unwanted circuit interruptions of the relay or to prevent unnecessary alarm conditions.
  • Advanced leakage current relays can detect current changes very quickly using microcontrollers and sensitive sensors. Such relays are more sensitive and capable of reacting quickly.

KRAFTEK supplies and sells many products in this field. You can contact us to get detailed information about residual current relay price and other issues and to create an order.

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