CN2134741Y - Security protecting switch for motor - Google Patents
Security protecting switch for motor Download PDFInfo
- Publication number
- CN2134741Y CN2134741Y CN 92230116 CN92230116U CN2134741Y CN 2134741 Y CN2134741 Y CN 2134741Y CN 92230116 CN92230116 CN 92230116 CN 92230116 U CN92230116 U CN 92230116U CN 2134741 Y CN2134741 Y CN 2134741Y
- Authority
- CN
- China
- Prior art keywords
- phase
- contactor
- thermal relay
- alternating current
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Control Of Ac Motors In General (AREA)
- Motor And Converter Starters (AREA)
Abstract
The utility model relates to a security protecting switch for motor, which is suitable for the protection of three-phase motors, comprising a three-phase AC contactor, a single-phase AC contactor, a thermal relay, an opening button and a closing button. The utility model can make a motor automatically switched off under the condition of loss of phase, under voltage, overload or overcurrent to perform the function of protecting motors.
Description
The present invention is the various motor safety guards of a kind of three-phase.
Existing plug-in strip, A.C. contactor, air switch, often not reaching desirable motor more than 90 percent by fuse thermal relay protection motor safety all is that phase shortage is to burn out.
Advantage of the present invention is that the phase shortage switch cuts out automatically, also can close automatically under the effect of thermal relay when under-voltage overload current increases.So can play the safety effect of protection motor.
The present invention is that following mode is finished.At first A, B, C three phase mains are connected on the three-phase ac contactor, connect thermal relay again by three-phase ac contactor, are connected by B again, lead to load by the single phase alternating current (A.C.) contactor.C phase power supply is connected on out button one end by the three-phase ac contactor sucking coil, and B is connected on out the other end of button mutually.
One of the sucking coil of single phase alternating current (A.C.) contactor terminates at A and goes up mutually, and the other end is connected on B or C goes up mutually.One of pass button terminates at the lower end of single phase alternating current (A.C.) contactor, the other end is connected on the long close point of thermal relay, the B that is connected on the three-phase ac contactor sucking coil by thermal relay goes up mutually again, at this moment press out button, the three-phase ac contactor turn-on power is by thermal relay, at this moment the single phase alternating current (A.C.) contactor also conducting at any time lead to load; At this moment B phase power supply passes through from the lower end of single phase alternating current (A.C.) contactor.Closing the button thermal relay and go up mutually towards the B of three-phase ac contactor sucking coil, is the self-insurance power supply with opening the button coincidence at this moment, works as usual so unclamp out the button motor.Because 4 the end of a thread of two A.C. contactor sucking coils are connected on respectively on A, B, the C three-phase, A, B, any phase phase shortage of C three-phase all can cause two one of them disconnections of A.C. contactor, as long as one disconnects another and also disconnects at any time, this just forms switch, and to close another kind automatically be that supply voltage is crossed low or overload current when increasing, and disconnects three-phase ac contactor sucking coil power supply and the principle of closing under the thermal relay effect.
Below with reference to accompanying drawing the present invention is described in further detail.
Among the figure, (1) three-phase ac contactor.Among the figure, (2) thermal relay.
Among the figure, (3) single phase alternating current (A.C.) contactor.Among the figure, (4) open button.
Among the figure, (5) close button.
Claims (1)
- A kind of motor safety protection switch, be made up of a three-phase current contactor, single phase alternating current (A.C.) contactor, shift knob and a thermal relay, it is characterized in that: (1) three-phase ac contactor and single phase alternating current (A.C.) contactor sucking coil, 4 joints are connected on respectively on three phase mains A, B, the C three-phase; (2) on the long close point of a termination thermal relay of the self-insurance power supply of three-phase alternating current contact sucking coil,, be connected on again on the lower end binding post of single phase alternating current (A.C.) contactor by thermal relay, pass button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92230116 CN2134741Y (en) | 1992-08-09 | 1992-08-09 | Security protecting switch for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92230116 CN2134741Y (en) | 1992-08-09 | 1992-08-09 | Security protecting switch for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2134741Y true CN2134741Y (en) | 1993-05-26 |
Family
ID=33773317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92230116 Expired - Fee Related CN2134741Y (en) | 1992-08-09 | 1992-08-09 | Security protecting switch for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2134741Y (en) |
-
1992
- 1992-08-09 CN CN 92230116 patent/CN2134741Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |