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This model explains the roles of the differential circuit breaker and the importance of connecting an electrical installation to the earth. The aim is to supply the electrical circuit with alternative 6V voltage (which simulate 230V AC) to run a DC motor in safety conditions. A metal frame around the motor simulate the metal carcass of the machine. A figurine with a LED on heart enable students to see when they are in situation of electric shock. The students can experiment dangerous situation (overcurrent, leakage current, earth fault, etc) and determine the best way to protect goods and persons. The device is supplied with 20 mm riders.