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RCCB is an abbreviation for Residual Current Circuit Breaker. It is a current-operated safety device that breaks the circuit when current leaks are detected, thus ensuring protection against electric shock.

Current leakages mainly happen when the current flowing in the circuit gets branched by a person who has direct or indirect contact with the current-carrying conductor. An MCB cannot detect these irregularities, whereas it can be easily detected by the RCCB.

A major advantage of RCCB is that it can control unbalanced electric current almost instantaneously, taking only 20 milliseconds to trip. Pressfit’s SFT1 RCCBs come with current ratings: 25A, 40A & 63A and rated residual operating current (IΔn): 30mA, 100mA & 300mA. SFT1 RCCBs adhere to the IS 12640 -1:2000, IEC 61008 norms and are a perfect fit for your electrical installations.






Neutral Advance Mechanism

The neutral wire makes first, and breaks last before the phase connections are switched on. This helps with the discharge of current in the case of capacitive current. Conversely, if the RCCB is switched off.

Comes With Test Button

SFT1 RCCBs are equipped with a test button which is marked with the symbol “T“. The main purpose of this button is to check whether the RCCBs are working properly or not. One thing to note is that it can only be checked when it is powered. A fully functional powered RCCB should get triggered immediately when the button is pressed. It is always advisable to test RCCBs once a month to make sure you are well-protected against electric shocks.

Voltage Independent

Since RCCB is a purely current-operated circuit breaker, it is independent of the voltage supplied. Even if the voltage drops, it does not trip and thus offers protection against leakage current even at low voltage.

IP20 Protection

Pressfit’s SFT1-RCCBs are devised with IP20 protection, which eliminates the risk of accidental contact with the live parts. It denotes the penetration protection level against solid objects of up to 12 mm, e.g. a person’s fingers. All live parts are shrouded to avoid direct contact with the internal parts of the RCCB, ensuring the safety of the installers.

High Short Current Capacity

Due to high short-circuit breaking capacity, SFT1 RCCBs are perfect for heavy electrical applications. They are competent to prevent electrical shocks by breaking the circuit, even if the current is up to 6 kA.

Fast Tripping Mechanism

It works according to the Core Balance Current Transformer (CBCT) principle, using which differential current in the circuit is measured with a sensitive relay for immediate fault detection. Any current leakage is sensed by the relay and consequently, the RCCB gets triggered.


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