UX30C30C01 datasheet(8/94 Pages) HONEYWELL

8 / 94 page

Basic Switches

Definitions of Terms

Honeywell Sensing and Control

For application help: call 1-800-537-6945.

Actuator – Mechanism of the switch or

switch enclosure which operates the con-

tacts.

Auxiliary Actuator – A mechanism, sold

separately, to provide basic switches with

easier means of operation and adjust-

ment and adapt switches to different op-

erating motions by supplying supple-

mental overtravel.

Basic Switch – A self-contained switch-

ing unit. It can be used alone, gang-

mounted, built into assemblies or en-

closed in metal housings.

Bifurcated Contacts – A movable con-

tact, generally gold plated, which is

forked to provide two contact mating sur-

faces in a parallel, for more reliable con-

tact.

Break – To open an electrical circuit.

Break Distance – The minimum open

gap distance between stationary and

movable objects.

Characteristics – This term is used by

MICRO SWITCH in a restricted sense and

refers only to switch operating character-

istics such as pretravel, operating force,

etc.

Circuit – The contact arrangement with

switch actuator and contacts in their nor-

mal position.

Dead break – Exists in all mechanical

switches. Definition: When the switch

plunger is being depressed, dead break

is non-contact immediately before the

plunger reaches the operating point.

When the switch plunger is being re-

leased, dead break is non-contact imme-

diately before the plunger reaches the re-

lease point. Dead break is expressed in

distance of plunger travel during which

the non-contact occurs. Manufacturing

specifications for most BZ/BA basic

switches allow a maximum dead break of

0.00005 in. (0,001 mm) measured at the

switch plunger. Switches are evaluated

while moving the plunger with the switch

installed in a 10 VDC, 0.100 ampere cir-

cuit. This specifiction does not apply to

switches that have been in service or have

not received proper handling or storage.

For applications sensitive to dead break,

call Freeport for information on applica-

ble electrical and mechanical conditions.

Dead make – When the switch plunger is

being depressed, dead make is non-con-

tact immediately after the plunger reac-

hes the release point. Dead make is ex-

pressed as the distance of plunger travel

during which the non-contact occurs.

Non contact is a failure of open contacts

to close (that is, the switch resistance ex-

ceeds the specified value) within the

specified range of plunger positions. If a

plunger position is specified with respect

to time, a non-contact is a contact miss.

Double Break Contacts – (Twin break).

This breaks the circuit in two places. Re-

ferred to as form Z circuitry also.

Form Z

Double-Pole Double-Throw (DPDT) –

Switches which make and break two sep-

arate circuits. This circuit provides a nor-

mally open and normally closed contact

for each pole.

Enclosed Switch – A basic switch unit

(contact block) enclosed in a durable

metal housing. The enclosure protects

the switching unit, provides mounting

means, and fitting for conduit connection.

Environment-Proof Switch – A switch

which is completely sealed to ensure con-

stant operating characteristics. Sealing

normally includes an ‘‘O’’ ring on actuator

shaft and fused glass-to-metal terminal

seals or complete potting and an elas-

tomer plunger-case seal.

Explosion-Proof Switch – A UL listed

switch capable of withstanding an inter-

nal explosion of a specified gas without

igniting surrounding gases.

Hermetically Sealed Switch – A switch

completely sealed to provide constant

operating characteristics. All junctures

made with metal-to-metal or glass-to-

metal fusion.

Magnetic Blow-Out Switch – Contains a

small permanent magnet which provides

a means of switching high d-c loads. The

magnet deflects arc to quench it.

Maintained Contact Switch – Designed

for applications requiring sustained con-

tact after plunger has been released, but

with provision for resetting.

Make – To close or establish an electrical

circuit.

Momentary Switch – A switch with con-

tacts that return from operated condition

to normal condition when actuating force

is removed. Unless otherwise stated, all

switches in this catalog are momentary.

Mounting Dimensions – All dimensions

on the mounting dimension drawings in

this catalog are subject to change without

notice. Request current drawings from

the nearest MICRO SWITCH Sales Office

or write to Freeport.

Normally Closed Contacts (N.C.) – Pro-

vide a normally closed circuit when actua-

tor is in free position.

Normally Open Contacts (N.O.) – Pro-

vide a normally open circuit when actua-

tor is in free position.

Precision Snap-Acting Switch –An

electromechanical switch having prede-

termined and accurately controlled char-

acteristics, and having a spring loaded

quick make and break contact action.

Projection Contacts – A design in which

one or more truncated projections are ar-

ranged on the stationary contacts. When

closed on the smooth, spherical surface

of the opposing contact this configuration

tends to break thru oxides and other film

contaminants to avoid the particulate

contaminants. Used with silver contacts,

this design can be a useful substitute for

the more expensive gold or gold alloy

contact material.

Pulse Switch – Provides a single pulse of

current for each cycle of operation.

Quick Connect Terminal – A plug-in type

terminal designed for quick switch wiring.

Repeatability – Ability of a switch to re-

peat its characteristics precisely from one

operation to the next operation.

Single-Pole Double-Throw (SPDT) –

Switch which may either make or break a

circuit, depending on how it is wired. Also

referred to as form C circuitry.

Form C

Single-Pole Single-Throw (SPST) –

Switch with only one moving and one sta-

tionary contact. Available either normally

open (N.O.) also referred to as form A cir-

cuitry; or normally closed (N.C.) also re-

ferred to as form B circuitry.

Form A

Form B

Terminal Enclosure – A housing that fits

over switch terminals to protect against

electrical shock and accidental shorting,

and facilitate wiring.

Two Circuit Switch – In one position,

moving contacts complete one circuit, in

the other position, contacts complete an-

other separate circuit.

UX30C30C01 Datasheet(PDF) 8 Page - Honeywell Solid State Electronics Center

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