A contact making and breaking device improves the dielectric absorption property of capacitance between one signal wire brought out from a reed switch and an conductive casing. A low current measurement system using the contact making breaking device greatly shortens the measurement waiting time when low current is measured. The contact making and breaking device includes a reed switch with first and second signal wires brought out from either end, a conductive casing, and an insulating material formed between at least the first signal wire and the conductive casing. A tubular conductor is emplaced in the region in which the insulating material is formed and at least partially encloses the reed switch. The tubular conductor is connected to the first signal wire.
A reed relay with which offset current is prevented competently, even when a coil is excited for relay operation, and high-speed, high-accuracy measurement of very low signals is possible, and energy consumption and production costs during assembly are low. The reed relay comprises a reed switch, an electrostatic shielded pipe through which the reed switch passes, an insulating support members and that support the reed switch inside the electrostatic shielded pipe, a coil bobbin that has a tube for insertion of electrostatic shielded pipe, and a coil wound and installed around the bobbin.
