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Residual Circuit Current Breaker
RCCB (Residual Circuit Current Breaker)
RCCB - Residual Circuit Current Breaker is an electrical wiring device whose function is to disconnect the circuit when it detects currents leaking to the earth wire. It also gives protection against electric shock or electrocution caused by direct contacts. RCCB is particularly useful in situations where there is a sudden earth fault occuring in the circuit. e.g. A person accidentally comes in contact with an open live wire in the circuit. In such situation, in absence of an RCCB in the circuit, an earth fault may occur and the person is at the risk of receiving an electrical shock. However, if the same circuit is protected with RCCB, it will trip the circuit in fraction of a second thus preventing the person from receiving an electrical shock. Therefore, it is a good and safe practice to install RCCB in your electrical circuit. A person can feel prickling sensations when he contacts with 10 mA of current. If he gets contact with 30 mA of current, he will face muscle contraction that might leads to respiratory paralysis. And when he gets in touch with above 100 mA, it will lead to electrocution.
Rated residual current An is the value of residual current 1A specified by the manufacturer at which
the residual current circuit breaker must switch out under specified conditions. Alternating residual current must release the residual current circuit breaker within An.
Rated current In is the value of current specified by the manufacturer, which can be transferred by the residual current circuit breaker continuously. So, the current In can pass through the contacts for an
unlimited time.
Rated operating voltage Un is the voltage the residual current circuit breaker is to be connected to and which properties are related to. The connected voltage has no effect on the device function but
on the function of the test circuit and isolation properties.
Rated frequency fn is the frequency the residual current circuit breaker is designed for and at which it works correctly under stated conditions. Majority of residual current circuit breakers are designed for
fn=50 to 60 Hz. As the residual current circuit breaker function is based on the induction principle, the residual current behaviour and frequency show an effect upon tripping. When using a device
designed for 50/60 Hz in a network with a different frequency, the user must count on a change of the tripping threshold i.e., a change of |1An
Ambient temperature T for the residual current circuit breakers is (-5 + +40) °C according to almost all international standards. Some residual current circuit breakers work in an extended range (-25 +
+40)°C. This possibility is identified by the following symbol on the rating plate.
Residual current circuit breaker - type AC - reacts to sine-wave residual current - it is used in conventional AC networks.
Application: Protection against indirect contact (indirect personnel protection). Protection is provided by
disconnecting hazardous high touch voltages caused by a short circuit to exposed conductive parts of equipment.
- Protects against Earth fault / Leakage Current & fulfil Isolation function.
- Advance Neutral breaks after phases, ensuring complete discharge.
- Truly current operated, operates even at very low voltage.
- Elegant appearance & Easy to operate & replace.
- Low-temperature rise.
- Truly current operated, operates even at very low voltage Higher operational endurance.
- Finger proof terminal protecting(IP20) against accidental contact with live part.
- Clear indication of the operational status of device.
- RCCB Body is Moulded Flame Retardant Thermoplastic material.
- Bi-connect terminals for bus bar as well as cable connections.
