Antique radios, Old Time Radios
HB-7020
|
|
|
|
|
| Tube type: |
Relay in glass (not Relay Triode) |
|
| Identical to |
HB-7020
|
| Was used by |
Industrial |
| Filament |
|
| Description |
SPST 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.
- SPST, 30 A at 110 VAC or 20 A at 220 VAC
- 110 VAC 60 Hz coil
- Fail-safe operation when coil is de-energized
|
| Information source |
-- Collector info (Sammler) Label on the device
- - Manufacturers Literature 1946 HB catalog
|
Collection of
|
|
|
|
You reach this tube or valve page from a search
after clicking the "tubes" tab or by clicking a tube
on a radio model page. You will find thousands
of tubes or valves with interesting links. You
even can look up radio models with a certain tube
line up.
[rmxtube-en]
| Data Compliance |
More Information |
|
|
|
