Reader for a digital trip device associated with a current breaking device

Claim 1

A display device used with a circuit breaker having a digital solid-state trip unit, the trip unit being fixed to the circuit breaker and comprising entering means for entering operating parameters, current measuring means, a first microprocessor coupled to said entering and measuring means and arranged to send a tripping order to said circuit breaker upon occurrence of an overload or a fault, on-off display means located in the trip unit for indicating the causes of a trip, said first microprocessor comprising first memory areas in which said parameters and current measurement data are stored, the display device being portable and capable of being coupled temporarily with the trip unit without mechanical contact, and comprising: a second microprocessor including second memory areas, alphanumerical display means coupled with the second microprocessor, and transmission means coupled with the second microprocessor for communicating with complementary transmission means with the trip unit coupled with the first microprocessor, to transfer the contents of the first memory areas to the second memory areas for selective display of the contents on said alphanumerical display means during or after temporary coupling of the display device to the trip unit, whereby said display device can be coupled selectively with different trip units.