Transcript Presentacfinal - ingles-escrito-uah-08

THE MICROSWITCH

History
 Types
 Troubleshooting
 Parts
 Ranges
History

The first micro switch was invented by Peter McGall in 1932 in
Freeport, Illinois. McGall was an employee of the Burgess Battery
Company at the time. In 1937 he started the company MICRO
SWITCH, which still exists as of 2008. It is now owned by Honeywell
Sensing and Control.

The MICRO SWITCH was one of the first components to
supercharge the race to miniaturization and high performance in
electronics. Prior to its debut, no switching mechanism had its strength,
repeatability, reliability, high current capacity, small size or weight,
according the company.

While modern technology has improved some of the materials used
in the MICRO SWITCH, most of the initial design has remained
unchanged, enabling the advancement and affordability of many of
today's modern machines and appliances.

"We began using MICRO SWITCH technology in the 1930s, and
Honeywell has gained our trust through decades of dependable
service," says Cheryl O'Connell, director of materials of United Electric
Controls. "The superiority of the MICRO SWITCH truly lies in its quality
and reliability. With 80 percent of our mechanical products using the
technology, we know we can depend upon the MICRO SWITCH to
exceed the performance requirements of our customers."

The first MICRO SWITCH— known as the Large Basic—was used to control
the temperature of chicken brooders. From those humble beginnings, the
MICRO SWITCH today has become the industry standard in electromechanical
control, used in millions of products from smoke alarms and dishwashers to
computer products and airplane landing gear.

In 1972, a WWII Hurricane bomber was recovered from a Canadian swamp.
While the aircraft had been submerged under water for 30 years, a Honeywell
MICRO SWITCH in the cockpit was still intact, sealed and functioning.

In 1975, a Honeywell MICRO SWITCH survived the 505 million-mile journey to
Mars aboard NASA's Viking Mars Lander. The switch, used in the retractable
surface sampler, helped scoop up Martian soil and deliver it safely back to the
biological laboratory.

Today, Honeywell manufactures more than 120 million MICRO SWITCHES
annually for aerospace and defense, industrial, off-highway and medical
applications. Honeywell's portfolio of MICRO SWITCH technologies include
subminiature switches, miniature switches, limits and enclosed basic switches,
toggle switches and rocker switches, among others.
Types Of Microswitches
Microshitches of lever
Microshitches specific for
high temperatures
Level sensors microswitches
(liquid-resistant microswitches)
WHAT IS A MICROSWITCH: Microswitch is a very
small component witch mission is to allow or not to
allow the electrical current in specific mechanical
situations.
Posible initial status:
NC: Normally Closed, it means that the
microwitch initially permit to the current
through the component when the switch
isnt activated
NO: Normally Open, it means that the
microwitch initially doesnt permit to the
current through the component when the
switch isnt activated
Electrical equivalences
INTERNAL PARTS
Plastic Switch
Hitter
Phase
Spring
Phase
Hitter Arm
Ground
This component is a highly reliable due to its simply
mechanical internal parts, but for this not less
important than other components, his utility is more
extended than we think, for example, automatic
doors or industry machines.
Also this device can opertate on Direct Current (DC),
or Alternate Current (AC)
Possible Problems: This component have many few
problems. The manufacturer reconmmend us review
the terminals if we have some problem. It have very
long life-time, up to 100,000 operations( for Standard
Microswitch ).
Maximum Values
• Current ranges
• Voltage ranges
• Temperature ranges
If a microswitch has a current, voltage or
temperature highest than the maximum and
minimum values, the device will be destroy.
Current Ranges
The current ranges depends on the microswitch size in
some models. This current can change.
For example, in the model S Serie Snap Action, we can
see this change of range:
The model Ultraminiature can support between 0.1 A
and 3 A
 The model General can support between 0.1 A and 15
A

In general, the current range is between 0.1 A and
15 A
Voltage Ranges
The voltage range depends on the model, if the device
works with AC, the voltage ranges can be between 22 V
and 250 V.
Temperature Ranges
The temperature range is the minimum and
maximum temperature that a device can work.
The temperature range in microswitches is about -30º
and 80º.