| 摘要 |
An electricity limit protection switch includes a relay, a sample-hold circuit having a current mutual inductor and an operational amplifier, and a compare and execution circuit having a plurality of operational amplifiers to operate the signal from the sample-hold circuit and a control element to control operation of the relay according to operation of the operational amplifiers so as to turn on or turn off the relay. Thus, the electricity limit protection switch can achieve an electricity limit protection purpose by sensing the magnitude of the current passing through the load.
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