5-1437567-8 Datasheet, PDF (293/326 Pages) Tyco Electronics – DIP Switch Part Number Index

Index/Matrixes
Glossary
• End of Life Criteria: Those specifications that a switch must
meet at the end of its specified electrical life. Typically contact
resistance and/or heat rise of contacts at full rated load at end of
life.
• Environmental Seal: A seal that totally encapsulates the switch
or relay providing a specified level of protection against
intrusion of solids, liquids or gases into the body of the device.
• Fixed Contact (Stationary or Statis Contact): The non-moving
contact. Typically integral to the end of the terminal inside the
switch body.
• Leakage Barrier: A ridge or web molded into a switch housing
between terminals or contacts to increase the surface distance
between them.
• Leakage Resistance: Dielectric Strength.
• Life: See Electrical Life: Mechanical Life.
• Logic Level: Refers to power levels typical of solid state
electronic circuits (TTL, CMOS, etc.). For switch selection see
Dry Circuit.
• Low Energy: See Dry Circuit.
• Flux: A material added during soldering to the metal surfaces
• Maintained: A position (throw) of a switch which remains
which on heating prevents oxidation and aids the flowing of the unchanged when actuation force is removed from switch
solder.
actuator. Contrast with Momentary.
• Gas-Tight Contact: A contact interface (movable to fixed
contacts) in which the forces holding the contacts together are
high enough to prevent gases from migrating between the
members. This prevents static oxidation of the contact and
subsequent intermittencies of high contact resistance. Typical
forces are 280,000 PSI and higher.
• Gold Flash: A plating of gold typically less than 10 microinches
(millionths) thick. Used only as a barrier to oxidation or
corrosion of terminals to maintain solderability.
• Heat Rise: An indirect measurement of contact resistance used
by rating agencies. The temperature rise over ambient of a
contact set carrying a prescribed current is measured to
determine whether it falls within safe limits.
• Inductive Load: A load in which the initial current on making
(closing) of the contacts is lower than the steady state. On
breaking (opening) of the contacts, the current is greater than
the steady state. Current lags voltage in inductive loads. Motors
are the most common inductive load. See Resistive Load,
Capacitive Load, Power Factor.
• Inrush: A transitory high-level of current through a contact set
on making (closing). A characteristic of capacitive and some
resistive loads. The inrush currents can be large and long
enough to cause severe degredation of the contacts. See
Resistive Load, Capacitive Load, Power Factor.
• Make-Before-Break (Shorting Contact, Make First): Movable
contact makes the next circuit before breaking the first circuit.
Typically found in slide switches. Contrast with Break-Before-
Make (MBB).
• Make First: See Make-Before-Break.
• Mechanical Life: The number of operations of a switch without
electrical load that does not result in a degredation of
parameters beyond the standard set by the applicable end-of-
life criteria.
• Momentary (Spring Return): A momentary switch position
(throw) is held only for duration of force applied to the switch
actuator.
• Movable Contact (Dynamic Contact): The contact moved by
the switch actuator into and away from contact with a fixed
contact thus forming the electrical circuits possible for a given
device.
• N.C.: See Normally Closed.
• NEMA: National Electrical Manufacturers Association. A US
Standards setting group for switch products most often applied
to switches mounted in various enclosures offering specified
degrees of protection against intrusion of liquids, dust,
corrosive elements, etc. NEMA ratings are common in
industrial or outdoor applications. See IP.
• Insert Molding: In switches and relays used to refer to
• NO: See Normally Open.
terminations that are placed in the mold so that plastic is
molded around the terminations. The chief benefit is an
• Non-shorting: See Break-Before-Make.
inherent seal against the intrusion of flux into the body of the
device. Therefore no epoxy terminal seal is required.
• Non-switching Rating: The power carrying capacity of a switch
after contact closure and end of contact bounce. Typically far
• Insulation Resistance: The resistance between insulated parts
measured at a specified DC voltage. Unit of Measure:
higher than the contact rating (switching rating) of a switch.
Unit of Measure: Volts and Amps.
Megohm.
• Normally Closed (NC): Normally closed contacts are closed
• IP: An industrial specification used in Europe (and worldwide) to ^{when switch actuator is in its unactuated position (e.g., the}
indicate the degree of protection provided by a component
plunger is in the resting position in the case of a pushbutton
M
against accidental contact, penetration of solids or liquids into
switch).
or through the component. See NEMA.
• Normally Open (NO): Normally open contacts are open when
the switch actuator is in its unactuated or resting position.
M8
Catalog 1308390
Issued 9-04
www.tycoelectronics.com
Dimensions are in inches
Dimensions are shown for
and millimeters unless otherwise reference purposes only.
specified. Values in parentheses Specifications subject
or brackets are metric equivalents. to change.
USA: 1-800-522-6752
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-5-729-0425
South America: 55-11-3611-1514
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
UK: 44-141-810-8967