1.JR29 series Thermal overload relay 2.The Most ... up electro-magnetic starters with B series AC contactors.JR29-16/25 thermal relays have a function trip operating ... trip operating mechanism(jump mechanism) for JR29-84/45;backpack jump mechanism for JR29-250/370. All of these prod ... -ucts have open phase protection.Main technical parameter JR29 series thermal ...