Circuit Protection Flashcards
What is the amount of heat generated proportional to?
to the square of the current (I2R)
What happens if the current doubles?
the heat is doubled
What is an over current device?
any device capable of automatically opening an electric current
What is an overload device?
device which protects from excess current but not necessarily short circuit protection
What is a heat sensitive device?
The operation of a fuse is it is a heat sensitive device that contains and element of metal alloy
What is the metal alloy?
weakest link in the circuit
Max current rating of plug fuses?
30a
Where are plug fuses mainly used?
In domestic ranges
how are circuit breakers made to be?
trip free
What happens if you hold the circuit breaker handle in the on position?
it will still trip “open”
What must you do if the circuit breaker is tripped?
turn it to the off position before it can be turned back on
What type of trip elements do most circuit breakers have?
both thermal and magnetic trips
