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Relay
Contact Life
Relay contacts are available in a variety of metals and alloys,
sizes and styles. There is no such thing as a universal
contact. The relay user should select contact materials,
ratings, and styles to meet, as precisely as possible, the
requirements of a particular application. Failure to do so can
result in contact problems and even early contact failure.
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The Need for Transient Suppression
When an electromechanical relay is de-energized rapidly by a
mechanical switch or semiconductor, the collapsing magnetic
field produces a substantial voltage transient in its effort to
disperse the stored energy and oppose the sudden change of
current flow. A 12VDC relay, for example, may generate a voltage
of 1,000 to 1,500 volts during turn-off. With the advent of
modern electronic systems, this relatively large voltage
transient has created EMI, semiconductor breakdown, and switch
wear problems for the design engineer. It has thus become common
practice to suppress relay coils with other components which
limit the peak voltage to a much smaller level.
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For Sales or Technical Information Call (818) 997-3933 or Toll Free (888) 997-3933 |
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13.Pickup and Dropout Voltages
14.Power Relays
Section II:
Guidelines for Relay Handling
1.Handling
2.Mounting
3.Flux Application
4.Preheating
5.Automatic Soldering
6.Hand Soldering
7.Relay Cooling
8.Cleaning
9.Coating
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