CN2304996Y - Three phase electric leakage breaker with protective terminals - Google Patents

Abstract

The utility model discloses a three-phase electric leakage breaker with protective wire connecting terminals, which relates to a protective electric appliance. On the basis of an ordinary electric leakage breaker, two wires are led out from a testing button and are arranged at proper positions; thus, two wire connecting terminals can be manufactured. The three-phase electric leakage breaker is used for being connected with a thermal relay or a travel switch, and for preventing the overheating, the phase failure, the overload, the spacing, etc. of a motor and devices thereof. Consequently, an AC contactor in the prior art, which is used for preventing the overheating, the phase failure, the overload, the spacing, etc. of the motor and the devices thereof is not needed. The utility model has the advantages that the link is simplified, a great deal of electric energy is saved, and the three- phase electric leakage breaker also has some functions of the AC contactor.

Description

The three-phase residual current circuit breaker of band protection binding post

A kind of three-phase residual current circuit breaker with the protection binding post relates to a kind of utility model of protecting electrical equipment.

The three-phase residual current circuit breaker of our use can only be to electric leakage now, overload, and protection is carried out in short circuit.As needs motor and equipment thereof are carried out phase shortage; overheated; during position limitation protection, must dispose A.C. contactor and its control switch in addition, indicator light; thermal relay or travel switch; just can finish these tasks, still, if after having used the three-phase residual current circuit breaker of this band protection binding post; just can save A.C. contactor and its control switch, indicator light.Can reach requirement equally.Finish the task of as much; and the three-phase residual current circuit breaker of this band protection binding post is just on the basis of three-phase residual current circuit breaker; draw two lines in the test knob; suitable position design in the three-phase residual current circuit breaker; make two binding posts; just make it possess some functions of A.C. contactor, can be used for being connected with thermal relay or travel switch and reaching, overheated, overload, the spacing protection phase shortage.

It is work like this in application; three-phase residual current circuit breaker protection binding post by a pair of normally open contact on the thermal relay of band open phase protection and this band protection binding post is connected; when motor and equipment generation phase shortage thereof; overheated; during overload; bimetal leaf in the thermal relay of band open phase protection will pests occurrence rule bending; thereby the lever machinery that promotes it makes its a pair of normally open contact closure; because of this is connected on the protection terminal normally open contact; and these two protection binding posts are to draw from two lines testing in the knob; so; at this moment just at ordinary times the test knob of residual current circuit breaker has been pressed the same like us; the three-phase residual current circuit breaker of this band protection binding post will be cut off the power supply at once; motor is stopped, play the effect of protection.

In machinery equipments such as lift; the travel switch of position limitation protection usually is installed on their the maximum home of movable body; in a single day machinery equipment has lost control; movable body has unexpectedly bumped against travel switch; make a pair of normally open contact closure in the travel switch; because this is connected with the protection binding post normally open contact; at this moment; just again as having pressed the test knob; the three-phase residual current circuit breaker of band protection binding post; will cut off the electricity supply at once; motor is stopped and reach purpose of safety, through test, it is slow when cooperating with A.C. contactor to carry out speed that spacing task reacts with the three-phase residual current circuit breaker of band protection binding post; so, selecting these characteristics that in form must consider it of travel switch for use.

According to chapter 7 second joint the 5th and the 7th regulation of " job site temporary electricity technical specification of security ", every power consumption equipment all should have special-purpose separately switch-box ...Must install earth leakage protective device in the switch-box ... so,, no matter be that any power switch case all should be provided with residual current circuit breaker.

In sum; as can be seen; it is overheated at needs motor and equipment thereof to be carried out; phase shortage; overload in the power switch case of position limitation protection, can be saved in the past A.C. contactor and its control switch; indicator light; and finish the task of as much, and reduced equipment cost, simplified link; improved reliability greatly; owing to, can save a large amount of electric energy, because want long-term consumed power during the work of the sucking coil of A.C. contactor without A.C. contactor; and the little sucking coil of the three-phase residual current circuit breaker of this band protective wire terminal is cold at ordinary times, has only when its execute protection task and just switches on work once.Do not had noise, circuit is simpler, and is more regular.When having overcome the cooperation of use A.C. contactor, the defect of main contact frequent tripping when motor starting.

Description of drawings: switch knob (1).Plastic casing (2).Test knob (3).Lead (4).Protection binding post (5).

When a pair of normally open contact in thermorelay or the travel switch is closed; because this is connected with protection binding post (5) normally open contact; and protection binding post (5) is to connect together respectively with two lines testing in the knob (3); so at this moment just look like to have pressed test knob (3) equally; the three-phase residual current circuit breaker of band protection binding post will disconnect immediately, and plays the effect of protection.

Claims (1)

1. A kind of three-phase residual current circuit breaker with the protection binding post; be by plastic casing (1); switch knob (2); test knob (3); and internal circuit and element composition, it is characterized in that having designed a pair of protection binding post (4) at plastic casing (1) inner edge, it is to be drilled with several Luo hole by the next door; hollow copper cylinder and the screw in the Luo hole constitute, and its inner is to be connected respectively with lead with two interior utmost points of test knob (3).

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