RCCB vs ELCB vs RCBO: Know the Difference
RCCB vs ELCB vs RCBO: Know the Difference
When it comes to electrical safety, it’s crucial to understand the distinct roles of RCCB, ELCB, and RCBO. Let’s break them down:
1️⃣ RCCB (Residual Current Circuit Breaker)
Function: Detects leakage currents and trips to prevent electric shocks.
Use: Protects humans from electrical faults (e.g., leakage to ground).
⚠️ Does not provide overload or short-circuit protection.
Example: Trips when someone accidentally touches a live wire and current leaks to ground.
2️⃣ ELCB (Earth Leakage Circuit Breaker)
Types: Voltage ELCB and Current ELCB.
Function: Monitors earth leakage voltage or current and disconnects the supply when leakage exceeds a safe limit.
Difference from RCCB: ELCBs detect voltage on the grounding system, while RCCBs sense current imbalances.
Note: ELCBs are older technology and are gradually being replaced by RCCBs in modern installations.
3️⃣ RCBO (Residual Current Breaker with Overcurrent Protection)
Function: A combination of RCCB and MCB. It protects against:
Earth leakage
Overload
Short circuits
Use: Ideal for circuits where both shock protection and fault protection are needed.
Versatile option for residential or commercial panels.
⚡ Summary:
RCCB: Leakage protection only
ELCB: Monitors grounding voltage/leakage (older tech)
RCBO: Combines leakage and overcurrent protection
Pro Tip: Use RCCBs for basic human protection, RCBOs for critical circuits where overloads might occur, and phase out old ELCBs wherever possible.
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Source: LinkedIn
Credits: Mr. Ibrahim Salman