Antique radios, Old Time Radios
235NO-120A
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| Tube type: |
Relay in glass (not Relay Triode) |
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| Identical to |
235NO-120A
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| Was used by |
Industrial |
| Filament |
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| Description |
Two-way mercury displacement contactor. In these devices an iron plunger floats on a mercury pool into a glass tube mounted inside a coil. When the excitation current flows into the coil, the plunger is attracted downwards so forcing the mercury to rise until it wets the contacts on the top of the bulb.
Due to the properties of mercury this kind of switch exhibits unique features which can be summarized in a very long and stable life, quite operation, extremely fast switching time, typically under 50 ps. Its operation is also safe against possibility of contact glued due to melting by overloads.
Unfortunately use of mercury contactors has been greatly reduced due to the problems that mercury creates for the environment when it is disposed of incorrectly.
- DPST, 35 A at 600 V resistive load
- 3 milliohms contact resistance, 250.000 cycles
- No arcing or contact bouncing. 50 ms operate, 80 ms release
- Fail-safe operation when coil is de-energized
- Coils can be series connected for 230 V AC operation
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| Information source |
- - Manufacturers Literature Datasheet
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Collection of
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