Miniaturization Technology in the “TK12” （小型化技术u201CTK12u201D）.pdfVIP

Miniaturization Technology in the “TK12” Thermal Overload Relay Fumihiro Morishita † Yukinari Furuhata † A B S T R A C T As resource and energy saving continue to progress, there are demands to reduce the size and improve the energy effi ciency of the control panels and machinery used in production facilities and other industries. There is also a higher demand to reduce the size and power consumption of the thermal relays which are the components in such equipment. Applying ever accumulated technology, Fuji Electric has developed the “TK12” thermal relay pur- suing miniaturization with reduction of part quantity, implementation of thermoplastic material for the housing, and improvement of the heating section design. The relays also meet global demands for safety and operability, and are equipped with terminal covers that conform to IEC 60529 as standard. 1. Introduction 2. Development Goals and Product Features Thermal type, electromagnetic type, induction type 2.1 Development goals and static type are available to apply overload relays The “TK12” thermal relay can be combined with for low-voltage induction motors. As in recent years, the “SK Series” miniature contactor to confi gure elec- the electronic control of motors using inverters and the tromagnetic switches. Amidst the recent trends to- like has become popular, electronic technology for over- ward resource and energy savings, the machinery current protection has also become progressed. and control p