Double pole (DP) RCCB, 100 mA, 25A to 63A — earth-leakage protection for single-phase equipment circuits and as an upstream RCCB; 240 V AC.
- Trips on an earth leakage of 100 mA — for equipment protection and upstream use, not shock protection.
- Double pole (phase and neutral), for single-phase 240 V AC, 50 Hz supplies.
- Rated current 25A, 40A or 63A — pick from the options.
- Test button — press it once a month; the RCCB must trip.
- Opens all poles together, including the neutral, when it trips.
- Does not trip on overload or short circuit — always install it with an MCB or fuse.
- 2 modules wide; snaps onto a standard 35 mm DIN rail.
An RCCB (residual current circuit breaker, often still called an ELCB) compares the current going out on the phase and neutral with the current coming back, and switches the circuit off if part of it leaks to earth — through damaged insulation, a faulty appliance or a person.
A 100 mA RCCB is commonly used for equipment protection and as an upstream (main) RCCB above 30 mA ones, so a small leak trips only the local 30 mA device. It also suits circuits whose normal leakage — many computers, UPS units or long cable runs — would nuisance-trip a 30 mA device. It does not give the shock protection of a 30 mA RCCB.
It does not trip on overload or short circuit, so it always works with MCBs or fuses. Ratings in this listing: 25A, 40A and 63A — choose one at or above the MCB that protects it.
Which RCCB do I need
- DP for single-phase supplies; FP for three-phase + neutral supplies.
- 30 mA: protects people — homes, bathrooms and socket circuits.
- 100 mA: equipment protection and upstream RCCBs.
- 300 mA: fire protection at the main incomer.
Where to use it
- Upstream (main) RCCB above 30 mA RCCBs in a single-phase board.
- Equipment and machine circuits in shops, offices and workshops.
- Computer, UPS and server circuits, with people protected by 30 mA devices.
How to install
- Switch off the main supply, confirm the board is dead, and snap the RCCB onto the DIN rail after the main MCB or isolator.
- Connect the supply to the LINE side and the outgoing circuits to the LOAD side, with the phase and neutral on their marked terminals.
- Take every neutral of the protected circuits through the RCCB, and never join neutral and earth after it — either mistake makes it trip.
- Switch on, press the test button (the RCCB must trip), reset it and label the board.
Electrical work should be done by a licensed electrician. For AC circuits only.
Frequently asked questions
- Do I need an RCCB if I already have MCBs?
- Yes. MCBs trip on overload and short circuit; an RCCB trips on earth leakage — current escaping to earth through a fault or a person. A safe board needs both.
- Can I use a 100 mA RCCB in my home?
- Only upstream of 30 mA RCCBs, not instead of them: the CEA safety regulations of 2023 require a residual current device of 30 mA or less in homes.
- Which current rating do I need?
- One at or above the MCB or fuse that protects the RCCB. Typically 25A for a single circuit or a small sub-board, 40A for a typical shop, office or home board and 63A for larger boards and main incomers.
- Will it trip together with a 30 mA RCCB below it?
- For small leaks, no — only the 30 mA device trips. On a large fault both can trip, as a standard RCCB has no time delay; full selectivity needs a time-delayed (S type) RCCB upstream.
- Why does my RCCB keep tripping?
- Usually a real leak: a faulty geyser element, washing machine or pump, damp wiring, or a neutral touching earth or shared with a circuit outside the RCCB. Switch off all MCBs, reset the RCCB, then switch the MCBs on one by one to find the faulty circuit.
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