Installing a circuit breaker is essential to ensure safety and electrical standards of Singapore. If you are considering installing a new aircon, you might be thinking whether it’s necessary to install a circuit breaker along with the aircon unit. Let’s discuss why you need to install the circuit breaker and how can a licensed electrician can do this job properly.
Do You Need a Circuit Breaker for Aircon in Singapore?
Yes, every aircon system in Singapore should have a dedicated circuit breaker. This is a requirement by the Energy Market Authority (EMA). A circuit breaker helps protect your home from electrical faults. Without this, the risk of fire or related damage increases during power surges or faulty electrical operation.
Benefits of a Circuit Breaker
Below are the way how a circuit breaker can benefit you:
Protects from electrical overload
It stops the flow of electricity if your aircon draws too much current.
Prevents short circuits
In case of faulty wiring or internal faults, the breaker cuts power instantly.
Improves safety
Reduces the risk of electric shocks and fire hazards in your home.
Easy to reset
Unlike fuses, breakers can be switched back on once the problem is fixed.
Supports maintenance
It allows you to safely isolate your aircon circuit during repairs or servicing.
Tools and Materials Needed To Install A Circuit Breaker
Before a technician install the circuit breaker, below are tools they need to have:
- Circuit breaker (correct amp rating for your aircon)
- Distribution board (if not already installed)
- Electrical wires (sized to match your aircon’s power needs)
- Insulation tape
- Screwdriver
- Voltage tester
Aircon Circuit Breaker Installation Guide – Step by Step
A licensed technician will follow below steps during installing the circuit breaker:
1. Turn Off the Main Power
Safety comes first. Always switch off the main power supply from the distribution board before starting your work.
2. Check the Aircon’s Power Requirements
Most air conditioners in Singapore use between 15A and 20A. Check the label on your aircon or consult the installer.
3. Choose the Right Circuit Breaker
Use a Miniature Circuit Breaker (MCB) with the correct amp rating. For most HDB flats, a single-phase MCB works.
4. Install the Circuit Breaker in the Distribution Board
Open the distribution board cover. Place the breaker into an empty slot. Clip or screw it into position based on your board type.
5. Connect the Wires
Now, connect below wires carefully:
- Connect the live wire from the aircon to the output side of the breaker.
- Connect the input side to the power supply line.
- Connect the neutral and earth wires to their proper terminals.
6. Double Check All Connections
Use a voltage tester to confirm no current is flowing while you work. Ensure all screws are tightened and wires are fully inserted.
7. Turn On the Power
Once everything is in place, close the distribution board. Restore the main power supply. Test the aircon to confirm everything works properly.
Do You Need a Licensed Electrician?
Yes, in Singapore, it’s required by law to hire a licensed electrician for any fixed electrical installation, including circuit breakers. Doing it yourself without proper qualification may result in safety risks and fines. Always check that the electrician is registered with EMA.
FAQ
What is the right circuit breaker size for a typical HDB aircon?
Usually, a 15A or 20A breaker is enough. Check the specification of the aircon for confirmation.
Can I use one breaker for multiple aircon units?
No. If you have multiple aircons, you need separate circuit breaker for each one.
Is an RCCB the same as a circuit breaker?
No. An RCCB protects from electric shock, while an MCB protects from overload. Both should be present in a proper setup.
How much does it cost to install a circuit breaker in Singapore?
Installing a circuit breaker for aircon in Singapore may cost around $80–$150, including labor and materials.
Can I upgrade my breaker if I change my aircon?
Yes. If your new unit has different power requirements, the breaker should be upgraded accordingly by a licensed electrician.
