4 Basic Relays

Mercury Displacement Relays

The mercury displacement relay works by isolating the load terminals from each other. The “plunger assembly,” which includes a ceramic insulator, a magnetic sleeve and other related parts, floats on top of the mercury pool. When the coil is power causing a magnetic field, the plunger assembly is pulled down into the mercury pool, which is in turn displaced and moved up to make contact with the electrode, closing the circuit between the top and bottom load terminals. This relay must be mounted vertically and is good for millions of cycles.

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