CN2346070Y

CN2346070Y - Open-phase protective A. C. contactor

Info

Publication number: CN2346070Y
Application number: CN 98231663
Authority: CN
Inventors: 喻吉平; 邹泽辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-11-16
Filing date: 1998-11-16
Publication date: 1999-10-27
Anticipated expiration: 2008-11-16

Abstract

The utility model relates to an AC contactor of open-phase protection, which comprises a contactor (1) and a phase interruption protection relay part (2). The utility model is characterized in that the utility model can achieve three-phase parameter control, the phase interruption protection relay part (2) which is adjacent to the contactor (1) controls the power supply switching of the magnet coil of the contactor (1), and any one phase of electric current breaks, the utility model can cut off rapidly the power supply to achieve reliable phase interruption protection.

Description

The open phase protection A.C. contactor

The utility model is a kind of open phase protection A.C. contactor in the control apparatus.

The electromagnet action of A.C. contactor of the prior art all is that when having only the disconnection mutually of the control participated in, main noddle on contactor just can disconnect by a phase or two-phase control.When not joining the disconnection mutually of control, electromagnet core is adhesive still, and main noddle on contactor can not disconnect, and electrical equipment is easy to damage because of the phase failure like this.In practice, motor burnout failure over half all is due to the open-phase running.

The purpose of this utility model is to overcome shortcoming of the prior art, and a kind of open phase protection A.C. contactor of three coherent controls is provided, and any one opens circuit mutually in the three-phase, and A.C. contactor can both cut off main power source rapidly, realizes open phase protection reliably.

The utility model can be realized by following technical proposal:

A kind of open phase protection A.C. contactor comprises contactor (1), open phase protection relay part (2), it is characterized in that realizing three coherent controls, at other open phase protection relay part (2), the on/off of control contactor solenoid of being provided with of contactor (1).

Below in conjunction with accompanying drawing the utility model is further described:

Fig. 1 is a structure chart of the present utility model; open phase protection relay part (2) is made up of an operating magnet, trace and a group or more normally open contact; open phase protection relay part (2) can be fixed on the shell of contactor (1), also can be fixed on the base plate.

Fig. 2, Fig. 3 are schematic diagrams of the present utility model, press starting button OA, and open phase protection relay part (2) coil J gets electric, and normally open contact J gets electric self-insurance, and the coil C of contactor (1) gets electric, often opens auxiliary contact C ₁, the closed self-insurance of main contact C, motor D work.When something unexpected happened: A opens circuit mutually, cenotype protection relay part (2) coil J dead electricity, normally open contact J disconnects, and contactor (1) coil C dead electricity, is often left auxiliary contact C at main contact C ₁Disconnect, motor D quits work; When C opened circuit mutually, contactor (1) coil losing electricity, often left auxiliary contact C at main contact C ₁Disconnect, motor D quits work.B has two kinds of situations when opening circuit mutually.When B opens circuit mutually among Fig. 2, contactor (1) coil losing electricity, main contact C, auxiliary contact C ₁Disconnect, motor quits work.When B opens circuit mutually among Fig. 3; the coil J of the coil C of contactor (1) and open phase protection part (2) forms the polyphone loop; each coil both end voltage descends, be lower than keep voltage can not self-insurance, each normally open contact disconnects simultaneously (says it is main contact C and auxiliary contact C from microcosmic angle ₁Disconnect earlier), motor D quits work.A, B, the arbitrary the utility model that opens circuit mutually of C can both be cut off the electricity supply rapidly like this, realize open phase protection reliably.

Claims

1, a kind of open phase protection A.C. contactor comprises contactor (1) and open phase protection relay part (2), it is characterized in that realizing three coherent controls, at other open phase protection relay part (2), the on/off of control contactor (1) solenoid of being provided with of contactor (1).