In this video:
* We take a look inside a thermal magnetic circuit breaker to see how it works with both AC and DC.
* I do a practical demonstration on how the circuit breaker works to protect against overloads and short circuits.
* We take a look at some circuit breaker ratings such as:
In: Rated current – maximum current that the breaker is designed to carry continuously at an ambient air temperature of 30 °C.
Icu: Ultimate short-circuit breaking capacity.
Ics: service short-circuit breaking capacity.
* I test what parameters (voltage vs current) affect the overload protection of a circuit.
* I demonstrate the instantaneous breaking / tripping capability of a circuit breaker on an oscilloscope under various loads.
* I show circuit beakers that are designed to cater for electric motor start-up inrush current with an adjustable instantaneous trip setting.

Watch the entire playlist here:  http://www.mjlorton.com/ac-power-and-electrics/

http://en.wikipedia.org/wiki/Circuit_…

Understanding Electric shock / Electrocution:
http://en.wikipedia.org/wiki/Electric…