| 摘要 |
A rapidly acting condition responsive switch for selectively connecting an input circuit with an output circuit which includes a pair of silicon controlled rectifiers connected in inverse parallel relationship between the input and output circuits wherein respective diodes are connected in series with each of the silicon controlled rectifiers to prevent leakage currents from flowing therethrough. Control means is provided to produce gate signals to render the rectifiers conductive. Lead means is adapted to connect an energizing source to the control means. A thermal sensing device which is operable to rapidly change from a high impedance state to a low impedance state at a preselected temperature is provided and is connected with the energizing source and the control means. A heater is in heat exchanging relationship with the thermal sensing device and is responsive to a predetermined condition to heat the thermal sensing device to the preselected temperature whereby the impedance of the thermal sensing device drops rapidly to the low impedance state to provide for the flow of current through the control means.
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