PROBLEM TO BE SOLVED: To provide a multi-pole type circuit breaker to make assembly work simple.;SOLUTION: An apparatus body 1 is constructed by putting a second side case 1B on a first side case 1A and connecting them. This connection is done by locking claw shaped locking parts 101 of tips of elastic locking pieces 100... projecting as one body from both side upper and lower four places of the first side case 1A toward the second side case 1B side with projection parts to be locked 102 provided on the second side case 1B corresponding to the locking parts 101. This connection is released by inserting a driver 151 from each release hole 150 opened on the second side case 1B corresponding to each part to be locked 102... and pressing the locking part 101 of each elastic locking piece 100... upward and releasing from a condition of locking with the part to be locked 102.;COPYRIGHT: (C)2001,JPO
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