Omron B3U-1000 Series Technical Information

Tactile Switches
Technical Information
Cautions
Use the Switch within the rated voltage and current ranges, other-
wise the Switch may have a shortened life expectancy, radiate heat,
or burn out.
Correct Use
■ Storage
Storage Environment
To prevent degradation, such as discoloration of the terminals during
storage, do not store the Switch in locations that are subject to the
following conditions;
• High temperature or humidity
• Corrosive gases
• Direct sunlight
Storage condition
Store the Switches in the packaging box.
After the packaging box is opened, use the contents as quickly as
possible. When storing leftover parts, make sure that appropriate
measures are taken against humidity and corrosive gases.
■ Handling
1. Operation
Do not repeatedly operate the Switch with excessive force. Applying
excessive pressure or applying additional force after the plunger has
stopped may deform the contact dome of the Switch, resulting in mal-
function. In particular, applying excessive force to side-operated
switches may damage the caulking, which in turn may damage the
switch. Do not apply force exceeding the maximum (29.4N {300 gf}
for 1 minute, one time) when installing or operating side-operated
switches.
Be sure to set up the Switch so that the plunger will operate in a
straight vertical line. A decrease in the life of the Switch may result if
the plunger is pressed off-center or from an angle.
Incorrect Incorrect
Tactile Switch is not recomended to use for detection purposes.
Omron's Detection or Snap-action switches are recommended for
this purpose.
Operating part
Plunger
Correct
Tactile Switches
This particularly applies to the instantaneous voltages and currents
when switching.
2. Dust Protection
Do not use switches that are not sealed in dust-prone environments.
Doing so may cause dust to penetrate inside the switch and cause
contact failure. If a switch that is not sealed must be used in this kind
of environment, use a resin sheet as shown below or other measure
to protect it against dust.
3. Usage Environment
Before installing the switch, make sure that the area of installation is
not subject to corrosive gases emited from surrounding parts.
Do not use in areas subject to high temeratures, high humidity or
toxic gases such as sulfuric gas (H
nitric gas (HNO ), or chlorine gas (Cl
3
age to the contacts and result in malfunction.
If there is silicon in the atmosphere, it may stop the contacts from
functioning properly. If silicon products such as silicon oil, silicon filler
or silicon wires are used in the surrounding area, install a contact
protection circuit to prevent arching or remove the silicon source.
The following situations may cause water to enter inside of the
Swtich, resulting in a malufunction due to contact failure or corrosion:
• Using the switch in an outdoor environment where it is
exposed to water drops for an extended period of time.
• Using the switch in an underwater setting where it is sub-
ject to strong water pressure.
Do not use switches that have been dripped. The mating section or
other internal parts may be damaged, resulting in malfunction.
■ PCBs
The Switch is designed for a 1.6-mm thick, single-side PCB.
Using PCBs with a different thickness or using double-sided,
through-hole PCBs may result in loose mounting, improper insertion,
or poor heat resistance in soldering. These effects will occur,
depending on the type of holes and patterns of the PCB. Therefore, it
is recommended that a verification test is conducted before use.
If the PCBs are separated after mounting the Switch, particles from the
PCBs may enter the Switch. If PCB particles or foreign particles from the
surrounding environment, workbench, containers, or stacked PCB's
become attached to the switch, contact failure may result.
Technical Information
Resin sheet
Switch
S, SO ), ammonia gas (NH ),
2 2 3
). It can cause corrosive dam-
2
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