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ELECTRO-DYN ELECTRONICS CORP.
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CURRENT SUPPRESSION DISC THERMISTORS High inrush currents initiated at turn-on can be effectively suppressed by use of ELECTRO-DYN disc type thermistors until the initial surge current has decreased to a tolerable level. The high inrush current, which is caused by the initial low impedance of the capacitor while being charged can damage the bridge rectifiers and/or other power supply components. The thermistor has relatively high starting cold resistance which provides protection for a sufficient period of time until the storage capacity reaches the tolerable level. This usually takes from 1 to 3 seconds depending on the thermistor type. The choice of thermistor in terms of it's size and it's cold and hot resistance is primarily dictated by the parameters of the capacitor. Contact us for Specifications or to Special Order. Thermistors decrease in resistance as a result of self-heating due to current flow, and they usually require a cool down period in the range of 60 to 120 seconds to again provide inrush current protection. The cool down time depends on the amount of current and time applied, the size of the thermistor, and the ambient temperature. |
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