From The Engineering Mindset.
How RCDs and GFCIs prevent electric shock. Many people think a standard circuit breaker (MCB) protects them, but it only protects wiring. In this video we explain RCD / GFCI protection, how they work, and when they fail.
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WHAT WE COVER IN THIS VIDEO:
⚡ MCB vs RCD — Why a standard circuit breaker only protects your wires, while you can still get a lethal shock.
⚡ THE PHYSICS OF A TRIP — How a toroidal transformer and magnetic flux detect tiny current imbalances (leakage) in milliseconds.
⚡ GLOBAL STANDARDS — The difference between RCCB, RCBO, and GFCI (North America vs. UK vs. Europe).
⚡ THE "BLINDED" RCD — Why modern LED chargers and EV chargers can cause Type AC RCDs to fail (Saturation).
⚡ LIVE BENCH TESTING — We use a Fluke Multifunction Tester and an Oscilloscope to see the trip waveform in real-time.
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VIDEO CHAPTERS:
0:00 Why standard circuit breakers don’t stop electric shock
1:43 How RCDs / GFCIs protect people
2:44 RCCB vs RCBO vs GFCI
4:49 How an RCD works
5:39 Magnetic field and sense coil explained
7:35 How RCDs detect leakage current
8:38 How the trip mechanism works
9:04 Electronic RCD design
10:25 When an RCD will not protect you
11:24 Type AC vs Type A vs Type F vs Type B RCDs
13:05 How to test an RCD
13:26 Fluke RCD test
15:54 Oscilloscope view of an RCD trip
16:49 How RCDs save your life
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