1. A RELAY COMPRISING A HOUSING INCLUDING A DIELECTRIC CUP PORTION, AT LEAST THREE SPACED TERMINAL LEADS EXTENDING INTO AND SUPPORTED ON THE DIELECTRIC CUP PORTION TO PROVIDE INNER AND OUTER SPACED TERMINAL ENDS, A PAIR OF FIXED CONTACTS WITHIN THE DIELECTRIC CUP PORTION SUPPORTED ON THE INNER TERMINAL ENDS OF TWO OF THE TERMINAL LEADS AND COMPRISING RIGID PLATE-LIKE CONDUCTIVE MEMBERS HAVING SPACED FREE-END PORTIONS PROVIDING FIXED CONTACT SURFACES, AN ELONGAED MOBILE CONTACT SUPPORTED WITHIN THE HOUSING AND NORMALLY RESILIENT URGED IN A FIRST DIRECTION TO DISPLACE THE MOBILE CONTACT TO MAKE A CIRCUIT THROUGH ONE OF THE FIXED CONTACTS OF THE PAIR AND THE THIRD TERMINAL LEAD, AND AN ACTUATING ASSEMBLY MOUNTED ON THE HOUSING AND CONNECTED TO THE MOBILE CONTACT INTERMEDIATE ITS ENDS AND OPERABLE TO MOVE THE MOBILE CONTACT IN A SECOND DIRECTION OPPOSITE TO SAID FIRST DIRECTION TO DISPLACE THE MOBILE CONTACT TO BREAK A CIRCUIT THROUGH SAID ONE OF SAID FIXED CONTACTS AND MAKE A CIRCUIT THROUGH THE OTHER ONE OF THE FIXED CONTACTS AND SAID THIRD TERMINAL LEAD, SAID TERMINAL LEADS COMPRISING TUBULAR METALIC MEMBERS HERMETICALLY BRAZED AROUND THEIR OUTER PERIPHERIES TO THE DIELECTRIC CUP PORTION AND TWO OF WHICH HAVE FLATTENED AND HERMETICALLY SEALED END PORTIONS WITHIN THE HOUSING CONSTITUTING SAID PAIR OF FIXED CONTACTS.