thanks you guys found the problem! bs 5424 breaker the coil is gone and found out that this device belongs to the suppler. so i will let them fix it. but just want to find out way there was no power to this board. i opened this device removing the mains fuse first, so that everything was dead retested it was dead. in side this device bs5424 was a 3amp fuse which was fine. energized the board and depressed the coil to find the board became live release it the board went dead. hence the coil must be burnt out. thanks again
