| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermal overload relay capable of stabilizing operation characteristics of a pushing shifter, a pull shifter, and a differential lever on the occurrence of an overload current or occurrence of phase interruption and transmitting bending displacement of a bimetal efficiently to a contact mechanism. SOLUTION: Slits for shifter sliding 10a, 15a, 16a are formed in a housing space partition 10 and bimetal partitions 15, 16, and the pushing shifter 7 and the pull shifter 8 are inserted into these slits for shifter sliding. Guiding long holes 22, 23, 30, 31 which extend in straight line shape along the bending displacement direction X are formed respectively in the pushing shifter and the pull shifter. Engaging protrusions 24, 25, 32, 33 which are engaged with the inner wall in major axis direction of guiding long holes 22, 23, 30, 31 are formed on the slit face of the slits for shifter sliding 15a, 16a of the bimetal partitions. These guiding long holes and engaging protrusions are used as a shifter displacement guide to displace the pushing shifter and the pull shifter. COPYRIGHT: (C)2011,JPO&INPIT
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