RCCB replacement and DB box upgrades for HDB and condos
Power trip repair in Singapore is from S$138 to S$480 for a like-for-like 30mA RCCB or MCB from Hager, ABB, Schneider or Legrand. A power socket install on an existing circuit is S$55. A dedicated 20A, 32A or 40A appliance circuit is S$220 to S$450. An HDB 12-way to 18-way consumer unit is S$480 to S$780. A condo, landed or small-office 18-way to 24-way overhaul with LEW testing is S$780 to S$1,150.
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One breaker, one hungry appliance, or a full board
If the RCCB opens during rain or when the water heater and aircon start together, isolate before anyone replaces the whole board. The RCCB and MCB troubleshooting guide is the half-split. The DB upgrade calculator prices the board, the new circuit and the LEW test.
| What you see | Likely cause | What to do first / typical cost |
|---|---|---|
| Whole flat trips, including in the rain | 30mA RCCB is seeing leakage | Diagnose and replace one RCCB or MCB: from S$138 to S$480 |
| Hob, oven or heater trips only its own way | That circuit is undersized or shared | Dedicated 20A, 32A or 40A pull: S$220 to S$450 |
| No spare ways, handwriting on the door | HDB board is a 12-way that is full | 12-way to 18-way Hager or ABB DB: S$480 to S$780 |
| Landed house or office board is full | 18-way to 24-way metal-clad unit | Overhaul and LEW test: S$780 to S$1,150 |
2026 DB box and circuit bands
Pre-1985 HDB flats are in the EMA 30mA RCCB requirement as well. A new DB is not an HDB hacking permit. A new water point for a heater is still a PUB Licensed Plumber.
| Job | 2026 SGD band | Inclusions |
|---|---|---|
| Emergency power-trip diagnostic and one RCCB or MCB | S$138 to S$480 | Faulty circuit isolation and one 30mA RCCB or MCB. Hager, ABB, Schneider or Legrand. |
| Dedicated 20A, 32A or 40A appliance circuit | S$220 to S$450 | High-load pull and a double-pole switch or isolator for an induction hob, oven, dishwasher or storage water heater. |
| Power socket install | S$55 | One power socket on an existing circuit. A new high-load appliance circuit stays S$220 to S$450. |
| HDB 3-room, 4-room or 5-room DB upgrade, 12-way to 18-way | S$480 to S$780 | Hager or ABB enclosure, dual or split RCCB, and full circuit labelling. |
| Condo, landed or small-office DB overhaul, 18-way to 24-way | S$780 to S$1,150 | Metal-clad or flush consumer unit and EMA LEW testing. |
A shop board is the same licence, a different load
The rows on this page stay the rows. A shop above 45 kVA needs a higher class of licensed electrical worker.
Plan RCCB replacement and DB box upgrades for HDB and condos
Confirm which rooms die, and whether the trip happens in the rain or with one appliance.
Isolate before the cover comes off. The test button on a 30mA device is a homeowner check. Opening the board is the electrician.
Replace or repair the fitting that matches the fault. Do not bridge a protective device.
Label the way, test, and leave the cover on.
- Emergency power-trip diagnostic and one RCCB or MCBS$138 to S$480
- Dedicated 20A, 32A or 40A appliance circuitS$220 to S$450
- Power socket installS$55
- HDB 3-room, 4-room or 5-room DB upgrade, 12-way to 18-wayS$480 to S$780
| Access | HDB | Condo | Landed |
|---|---|---|---|
| Board | Many HDB boards are 12-way and already full. | MCST may require the licensed electrician’s form and quiet hours. | The intake and the sub-board can be far apart. Measure the run. |
| Protection | EMA 30mA protection applies, including pre-1985 flats. | The same device rule. The management office may ask for notice. | Outbuildings and wet outdoor points need the correct enclosure, not an indoor faceplate. |
| New circuits | A new cable is electrical work, not a handyman spur. | The building may ban surface trunking in common corridors. | A charger or a workshop circuit is designed, not tapped off a socket. |
- Photo of the DB door and the schedule
- Note which appliance was on when it tripped
- Do not reset a burning smell
- Clear a path to the board
- Say if the home is HDB, condo or landed
Frequently Asked Questions
How much is an RCCB replacement in an HDB flat?
Diagnosis, isolation and one like-for-like 30mA RCCB or MCB is from S$138 to S$480. Brands on the van are Hager, ABB, Schneider and Legrand.
Do older HDB flats need an RCCB?
Yes. EMA requires a 30mA RCCB, including flats built before 1985. A full 12-way to 18-way HDB DB upgrade is S$480 to S$780.
Can you add a circuit for an induction hob?
A dedicated 20A, 32A or 40A circuit with a double-pole isolator is S$220 to S$450. The hob itself is not in that band.
How much is a power socket install?
A power socket on an existing circuit is S$55. That is not a new 20A, 32A or 40A appliance circuit, which stays S$220 to S$450.