RCCBs detect tiny imbalances in electrical currents, cutting power in milliseconds to prevent electric shocks or fires. But when they trip repeatedly, frustration overshadows their lifesaving role. Why does this happen? How do you fix it? And what should B2B buyers know when selecting RCCBs? Let’s demystify the chaos.
The RCCB(full form in electrical: Residual Current Circuit Breaker), also commonly referred to as a circuit breaker, is an electrical safety device designed with the primary purpose of immediately interrupting the electricity supply upon detecting any leakage of current that could potentially lead to an electric shock. This rapid disconnection is crucial in minimizing the duration of exposure to hazardous electrical currents, thereby significantly reducing the risk of injury or even fatality. You might also encounter RCCBs being referred to as Residual Current Devices (RCDs) or Residual Current Breakers (RCBs), all denoting the same essential safety component.
Learn More: RCCB Guide
A ground fault occurs when current escapes the circuit, often due to damaged insulation, frayed wires, or faulty appliances. For example, a cracked washing machine cord might leak current into its metal body, triggering the RCCB.
Outdoor sockets, bathrooms, or kitchens with water ingress are prime suspects. Even condensation in a garage socket can cause intermittent RCCB tripping.
Old or damaged devices like refrigerators, microwaves, or heating elements often leak current. Plug them in, and the RCCB reacts instantly.
Some RCCBs trip due to minor fluctuations, like a flickering LED bulb or nearby lightning strikes.
This is a common misconception. Let’s clarify:
Overloads: Caused by too many devices drawing power. Handled by MCBs (Miniature Circuit Breakers), not RCCBs.
Short Circuits: Occur when live and neutral wires touch. Again, MCBs manage this.
RCCB’s Role: Focuses solely on current leakage. However, if a short circuit also causes leakage (e.g., through water), the RCCB may trip.
Key Takeaway: RCCBs don’t replace MCBs—they complement them.
Lightning strikes induce massive voltage surges. While RCCBs aren’t surge protectors, they can trip if:
Surges create temporary current imbalances.
Surges damage wiring, causing leaks.
Solution: Pair RCCBs with surge protection devices (SPDs) to absorb lightning-induced spikes.
Learn More:
How to Stop Your RCD from Tripping
Top 10 Reasons and Solutions for Frequent Tripping of MCBs
| Step | Fixing |
| 1. Isolate the Fault |
Turn off all electrical appliances. Reset the RCCB. If it stays on, the issue lies with a device. |
| 2. The “One-by-One” Test | Plug in appliances sequentially. If the RCCB trips when connecting your dishwasher, you’ve found the culprit. |
| 3. Check for Moisture |
Inspect outdoor sockets, pipes near wiring, or damp walls. Dry affected areas and seal leaks. |
| 4. Test the RCCB |
Use the built-in test button monthly. If it doesn’t trip, replace the RCCB immediately. |
| 5. Call a Professional For |
Persistent tripping despite no visible faults. Burning smells or scorch marks. Older homes with ungrounded wiring. |
| Solution | Prevent |
| 1. Replace Faulty Appliances | A leaking water heater? Repair or replace it. Use a portable RCCB tester to confirm faults. |
| 2. Waterproof Critical Areas |
Seal outdoor sockets with silicone. Install weatherproof covers in gardens or balconies. |
| 3. Upgrade to RCBOs | RCBOs combine RCCB and MCB functions, reducing nuisance tripping by isolating faults to specific circuits. |
| 4. Install Surge Protectors | Lightning-prone areas need SPDs to shield RCCBs from voltage spikes. |
| 5. Rewire Problematic Circuits | Replace outdated aluminum wiring with copper, especially in damp zones. |
ANS: Inspect your wiring regularly for loose or exposed connections. Hire a certified electrician to tighten any loose connections. Too many appliances connected to a single circuit can cause power fluctuations, potentially tripping the RCCB. Distribute appliances across different circuits to prevent overload.
ANS: Conclusion. RCCB tripping problems often stem from moisture, wiring faults, or appliance issues. Resolving these involves systematic steps like resetting the RCCB, inspecting connections, and isolating faulty equipment.
ANS: RCCB ratings (or levels) for households are expressed in Amps (e.g., 16 Amps, 20 Amps, etc.), corresponding to load requirements, with tripping sensitivities ranging from 30 and 100 mA. Electricians recommend modern RCCB types (Type A or similar) with a 32-63A rating and a tripping sensitivity of 30 mA.
ANS: RCCB does not protect from current overload. It has been designed to protect only when the live current and neutral current are different. However, a current overload cannot be detected. RCCB does not protect against line-neutral shocks.
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