Microtek RCCB is one of our safety solution designed to protect the consumers from fatal electric shocks and prevent fire caused by earth faults. The RCCB is a mechanical switching device that carries and breaks current under normal service conditions and to causes the opening of the contacts when the leakage current attains a given value under specified conditions. The high quality insulation and wires adds to the safety of consumer.
The RCCB Works on the Current Balance Principle. The Supply Conductors, i.e. The Phases and The Neutral are Passed through a toroid and form the primary windings of a current transformer. Its Secondary Winding is connected to a highly Sensitive electromagnetic Trip relay, which operates the Trip Mechanism.
In a Healthy Circuits, sum of the current in Phase is equal to the current in the Neutral and the vector sum of all current is equal to zero. If there is any insulation Fault in the circuits and Leakage current flows to earth, the current do not Balance and their Vector Sum is not equal to zero. This Imbalance is detected by the Core Balanced Current Transformer, The RCCB is tripped and Supply to Load is interrupted. The Trip Mechanism is operated at a residual Current Between 50-100% if it’s Rated Tripping Current.
PROTECTION AGAINST ELECTROCUTION
The Use of Exposed, Substandard Badly Wired Wrongly Connected or Damaged Equipment as well as frayed or badly Repaired Cables Reduce the Safety of an Installation and increases the risk of person receiving an electric shock. Electrocutions is a passage of current through human body. Which is dangerous. The flow of current through Human body effect vital functions such as
1. Breathing 2. Heartbeat
A correctly chosen RCCB can detect small Current Flowing to earth and reduce the risk electrocution. Effect of electric current through Human body have been well researched and following chart summarizes the Result:
However, electrical shock should not be viewed in terms of “current” alone, but in terms of ‘contact Voltage’. A Person gets electrocuted by coming in contact with an object that has a different potential from His/her own. The difference in potential causes the current to flow through the body.
TRIP INDICATION WINDOW – Provided With Trip Indication Window Which Turns Red in Case of any Trip Due to Fault, Signaling to Check the Electrical Circuit For any Leakage.
Bi CONNECT TERMINALS – The Terminal Size in Devices Adapts Convenience and Flexibility While Wiring. The 25sq mm Terminals are designed to hold Cables tightly are designed to Hold Cable Tightly to avoid loose Connection. The Bi-Connect Terminal Provides the Flexibility by allowing the Lines to be connected through Wires and Bus Bars.
PROTECTION IP-20 – We Realize The Importance of Safety and have Designed the range in Such a way That no Live Parts are Exposed to Human Contact, thus making Devices Safe to use.
TEST BUTTON ‘T’ – A Test Circuit Included with the Residual Current Devices Ensures That the Reliability of RCCB is tested. When the Test Button is pushed the Current Starts to Flow through the Test Circuits. As it creates an imbalance on the neutral coil of the devices, the RCCB trips and Supply is disconnected thereby checking RCCB’s Reliability.
SUPERIOR SENSITIVITY & RAPID OPERATING MECHANISM – Superior Sensitivity to the Core to Sense the Faults & Danger Swiftly as they Approach the Circuits to Occur with on Time Operation Agility.
Range - 25A - 63A
Execution - Double Ploe (DP) / Four Pole (FP)
Specification - IS 12640 Part 1 / IEC 61008-1 / EN 61008-1
PROTECTION IN THE EVENT OF DIRECT CONTACT
To provide extra protection in the event of direct contact with an (unearthed) live part, extremely Sensitive RCCBs with a rated residual operating current of TO mA (Ian = 30 mA) are used instead of More conventional RCCBs with higher residual operating fault currents. This extra protection is necessary in the following cases:
The insulation of totally insulated devices or their load is damaged
The earth wire is interrupted
The earth wire and live wire have been accidentally transposed
A component which is live in normal operation is touched during repair work
In case of a socket outlet power circuit in rooms with bath or shower
For caravans, boats and yachts and the power supply on camping or berthing sites
For electrical appliances used in medical facilities
The drawn-in-switch-off characteristics of residual current devices with a rated fault current of 10 mA and 30 mA is proof that these are able to prevent the occurrence of dangerous heart chamber Fibrillation. For this reason, residual current circuit breaker with rated fault current of 10 mA Are used for protection of particularly exposed individually equipment. Residual current circuit breaker with 30 mA rated fault current are already specified for many Areas (bath, rooms with medical facilities, outside areas, agricultural land etc.).
A 30 mA RCCB will provide a high degree of protection against electrocution in an accidental shock Hazard situation. The current flowing through human body could be between 80mA and 240mA depending On the resistance of the human body and the voltage across it. To be within zone of IEC curve, it is necessary for the RCCB to operate within 50ms at 240 mA and 150ms at 80mA. Both these conditions are satisfied by 30mA RCCB. For households, individual Outlets, wet areas and temporary installations, RCCB with sensitivity not exceeding 30mA is Advisable.
A 100 mA RCCB will normally give high degree of protection against electrocution but there is a Possibility that the shock current could fall below the tripping level of RCCB. This could occur if Additional resistances to that of human body are included in the earth path. The 100 mA RCCB protects against leakage currents and in direct contact with earth loop impedance Up to 500 Ohms.
300 / 50OmA
A 300/500 mA RCCB may be used only where fire protection is required. For example, on lighting Circuits where the risk of electric shock is small. 300/500 mA RCCB will not give any protection Against electrocution.