Why Does a Differential Circuit Breaker Keep Tripping?
Introduction
A differential circuit breaker (GFCI breaker/RCD) is a crucial safety device that protects your home from short circuits, overloads, and ground faults. However, if your breaker keeps tripping unexpectedly, it could indicate an underlying issue in your electrical system.
This guide covers:
✔ Common reasons why your breaker trips
✔ How to troubleshoot and fix the problem
✔ Preventative measures to avoid frequent shutdowns
How Does a Differential Circuit Breaker Work?
A differential circuit breaker monitors the difference between the incoming (hot/live) current and the outgoing (neutral) current.
Key Functions:
✔ Overload Protection: Trips when too many devices draw power beyond the breaker's limit.
✔ Short Circuit Detection: Instantly shuts off power if a short occurs in wiring or appliances.
✔ Ground Fault Protection: Cuts power if leakage current is detected (i.e., electricity flowing where it shouldn't).
Why Does It Trip?
If the breaker senses a discrepancy in current flow, it automatically shuts off power to prevent electrical hazards.
Top Reasons Your Differential Circuit Breaker Trips
1. Overloaded Circuit
Signs:
- Breaker trips when multiple devices are plugged in.
- Lights flicker or dim when large appliances turn on.
Causes:
✔ Too many devices on one circuit (exceeding amperage).
✔ High-power appliances (heaters, microwaves, air conditioners) pulling excess current.
✔ Undersized wiring for the total electrical load.
Solution: