JM1-2.5, JM1-2.5D type lsmall bus bar wiring shelf is it exchange relay protection, FHIYGCF of 440V reject, direct current control electric equipment of rejecting etc. To 660V (50Hz or 60Hz ) to suitable for mainly, used to erect the small bus bar that is not greater than 120A in the electric current. JM1-2.5, 2.5D type little bus bar wiring shelf both sides have two M4 make screw up, can is it connect 4 and a half stick of to press respectively generally each. 5mm2 and putting the wire, uses and obtains exchanging in the direct current source.