PTC THERMISTORFOR TEMPERATURE SENSING LEAD TYPE PSL type has been developed for protecting power transistor, etc. from overheating for preventing stereo main amplifiers from overheating and also for sensing the temperature of other components which may be overheated. The element of PTC offers an excellent temperature sensing ability, exhibiting a steep change in electrical resistivity near the temperature setting. PSS type is usable as a sensor for temperature in air. SYMBOL TYPE [ S : Straight, F : Forming, L : LUG ] NOMINAL DIA [ 04 : 4mm ] CURIE POINT( ) [ A : 40, B : 50, C : 60 ] RESISTANCE VALUE [ 101 : 100 ] PS 04A 101 S & & & & & & PSL type is of a screw - fixing type and PSS/PSF is of a lead type, therefore mounting is easy. Compact and light design as well as excellent thermal response. Elements of solid-state construction withstand mechanical vibration and impact sufficiently. Contactless operation provides a prolonged service life, yet permits noiseless operation. The operating point of PTC is set on the steepest point along the resistance-temperature characteristic curve, thus performing the overheat protective operation securely. PSL type and PSS/PSF type have the same temperature characteristic, providing a selection depending on the mounting method. FEATURES SPECIFICATIONS 5.0 max. 7.0 max. 28 min. T : 4.0 max. 28 min. 18 MICROTECH (HONG KONG) LTD. Tel: +852-2799 4649 Fax: +852-2121 8310 Email: [email protected] 19 -50 0 100 101 102 103 104 105 106 107 108 109 50 100 150 200 250 300 TEMPERATURE( C) R E S I S T A N C E ( ) W -50 0 100 101 102 103 104 105 106 107 108 109 50 100 150 200 250 300 TEMPERATURE( C) R E S I S T A N C E ( ) W P T C Transformer PTC switches if either temperature or current limits are exceeded Power Transistor if the transistor overheats, the PTC will sense the over-temperature condition and prevent thermal runaway. Load Electric Motor The motor is switched off when one or more of the wincingsoverheats. AC PTC PTC PTC P T C APPLICATIONS RESISTANCE / TEMPERATURE CHARACTERISTICS The typical standard PTC has an extremely high temperature coefficient of resistance at and above the switch temperature, this characteristic makes it ideal for various temperature sensing applications, especially over-temperature detection. SAMKYUNG manufactures unit specifically designed for sensing the temperature of various devices including power transistors, heat sinks, motor windings, transformers, etc. Figure illustrates some of the applications. MICROTECH (HONG KONG) LTD. Tel: +852-2799 4649 Fax: +852-2121 8310 Email: [email protected]