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what is the inverse time of the theraml overload?
If you are describing a circuit breaker then its electromagnetic trip component will operate in the event of a line*-to-ground (*not 'phase'!) short circuit. The thermal overload component will only operate in the event of a sustained overload.
The load current is made to flow through the thermal overload relay, which is actually a bimetalic strip. Beyond a prespecified current the bimetalic strip tend to deflect due to heat (thermal effect) thus cutting off the circuit and hence it acts as an over load relay protection.
125 percent of full current rating of the motor
Full load current ofthe motor x 0.58
what is the inverse time of the theraml overload?
depend on to existence of test equepment. if we have a single phase injection current and we want test the thermal overload we have to do serie the heater and inject current two time of thier setting.
If you are describing a circuit breaker then its electromagnetic trip component will operate in the event of a line*-to-ground (*not 'phase'!) short circuit. The thermal overload component will only operate in the event of a sustained overload.
multimeter from 1 end to the other.
there is a bi metalic strip is thre in thermal overload relay so when the currtent is high then its settings so that strip bend due to thermal and it touches the other side of the contact so when u touch the tester on that side u will find that its overload if u dont under stand contact me......
overload model no Ke-FKR4(D)
There are two sections of the fuse; a straight wire section that provides quick acting response to short circuit conditions, and a coiled spring section with a soldered lump with thermal mass that provides time delay for normal overload. When inspecting a blown fuse, you can tell if it was a short or an overload by looking at where the blowout occurred.
Motors are protected in two ways. Against a short circuit by fuses or breakers. Against overload by thermal overload heaters.
The load current is made to flow through the thermal overload relay, which is actually a bimetalic strip. Beyond a prespecified current the bimetalic strip tend to deflect due to heat (thermal effect) thus cutting off the circuit and hence it acts as an over load relay protection.
All types electromechanical and electronics. It is a design precaution to insure that cannot be any thermal runaway
Thermal setting plastic is plastic that can only be heated once and then set into the shape needed
stretching farther then normal