CN2037116U - Over-voltage automatic cutoff switch - Google Patents
Over-voltage automatic cutoff switch Download PDFInfo
- Publication number
- CN2037116U CN2037116U CN 88209903 CN88209903U CN2037116U CN 2037116 U CN2037116 U CN 2037116U CN 88209903 CN88209903 CN 88209903 CN 88209903 U CN88209903 U CN 88209903U CN 2037116 U CN2037116 U CN 2037116U
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- CN
- China
- Prior art keywords
- relay
- over
- voltage
- cutoff switch
- automatic cutoff
- 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.)
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an over-voltage automatic cutoff switch which belongs to a safety protective device for electrical equipment, comprising two relays, a resistor, a fuse and a push button, and the over-voltage automatic cutoff switch is simple in structure. When the voltage of the power supply exceeds the rated allowable value, the utility model can automatically cut off rapidly the connection between the electrical equipment and the power supply, which can protect effectively and reliably the electrical equipment.
Description
A kind of overvoltage automatic power-off switch.
The invention belongs to the security appliance protective device.
As everyone knows, in the electric equipment use, the reliable and stable of voltage is vital.For various reasons, the accident that raises and cause electric equipment to burn suddenly because of line voltage also often takes place so far, what have causes very serious economy loss.People have designed and produced all overvoltage Protector for electric appliance for this reason.But in existing overvoltage electric prospection product type; the electronic component that the has reliability deficiency that seems greatly influenced by ambient temperature because of being adopted; have because of complex circuit, element is many and make product price higher, so all do not reach practical and universal desired level as yet.
The objective of the invention is to propose a kind of simple in structure, the overvoltage automatic power-off switch that constitutes with electric component.
Accompanying drawing one is a schematic diagram of the present invention.
Electrical equipment identifier declaration in the accompanying drawing one is as follows: RD-fuse, QA-button.The RW-resistor.The ZJ1-relay, two normally opened contacts of ZJ1A, ZJ1B-relay ZJ1, the ZJ2-relay, the normally-closed contact of ZJ2A-relay ZJ2, II '-power input, OO '-power output end is connected to the electric equipment of being protected.
The realization of the utility model structure is described as follows in conjunction with figure one: be equipped with resistor R W in the overvoltage automatic power-off switch.Relay ZJ2 and normally-closed contact ZJ2A, resistor R W connects with relay ZJ2, and normally closed interlock ZJ2A one end is between QA and ZJ1, and the other end is connected to a bit mutually with ZJ1B, ZJ2.
The operation principle of this overvoltage automatic power-off switch is such: shown in accompanying drawing one; after supply voltage adds to II '; press the button QA; the action of just switching on of relay ZJ1 coil; normally opened contact ZJ1A, ZJ1B closure also realizes self-insurance; supply voltage is switched to the electric equipment normal power supply through OO ', and relay ZJ2 is in the protection standby condition simultaneously.When supply voltage raises suddenly, in the time of will jeopardizing electric equipment safety, relay ZJ2 action; normally-closed contact ZJ2A disconnects, relay ZJ1 coil blackout then, and normally opened contact ZJ1A, ZJ1B disconnect; cut off the supply voltage that goes to electric equipment OO ', thereby reached the purpose of protection electric equipment.
The condition of above-mentioned relay ZJ2 action is to debug in advance, promptly adjusts the ohmic value of resistor R W, makes that (for example more than the 250V) can make relay ZJ2 action when voltage reached a certain rated value between A, the I ' as shown in accompanying drawing one.
As one embodiment of the present of invention, for the automatic power-off protection of the overvoltage of general domestic electric appliance, each electric elements can adopt following type product in the accompanying drawing one:
The RD-fuse, the BLF-1 type;
The QA-button, the LA19-11 type;
The ZJ1-relay, 522, coil voltage 220V a.c;
The ZJ2-relay, JZX-2F type, coil voltage 220V a.c;
The RW-resistor, RXYC-10 type, 51-2700 Ω (adjust the RW value, making relay ZJ2 operation voltage is 250 volts)
Claims (2)
1, a kind of overvoltage automatic power-off switch; belong to the electric equipment safety guard; it comprises fuse RD, button QA; relay ZJ1 and normally opened contact ZJ1A, ZJ1B is characterized in that also comprising in the overvoltage automatic power-off switch resistor R W; relay ZJ2 and normally-closed contact ZJ2A; resistance R W connects with relay ZJ2, and normally closed interlock ZJ2A one end is between QA and ZJ1, and the other end is connected to a bit mutually with ZJ1B, ZJ2.
2, overvoltage automatic power-off switch according to claim 1, it is characterized in that: resistor R W is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88209903 CN2037116U (en) | 1988-08-25 | 1988-08-25 | Over-voltage automatic cutoff switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88209903 CN2037116U (en) | 1988-08-25 | 1988-08-25 | Over-voltage automatic cutoff switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2037116U true CN2037116U (en) | 1989-05-03 |
Family
ID=4843464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88209903 Withdrawn CN2037116U (en) | 1988-08-25 | 1988-08-25 | Over-voltage automatic cutoff switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2037116U (en) |
-
1988
- 1988-08-25 CN CN 88209903 patent/CN2037116U/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |