Over-current quick-protection circuit for measurement instrument
A power analyzer and protection circuit technology, which is applied in the detection field, can solve problems such as endangering personal safety and damaging measuring instruments, and achieves the effects of fast protection action, strong overcurrent capability, and wide application range
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[0012] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.
[0013] A fast overcurrent protection circuit for a power analyzer, comprising an input terminal 1 of a measuring instrument channel board, an input terminal 2 of a measuring instrument panel, an electromagnet 3, a dry reed switch and a relay. The electromagnet is an ironless electromagnet, dry The reed switch passes through the electromagnet coil, the normally open contact 4 of the reed switch is connected to the relay coil 5, the normally open contact 9 of the relay is connected to the input end of the channel board of the measuring instrument, and the input end of the measuring instrument panel is connected to the electromagnet ; Use ironless electromagnet and dry reed switch passing through the electromagnet coil to monitor whether the current input terminal of the measuring instrument is over-current.
[0014] When the protected current loop...
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