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Poznámky redaktora
• Travel and operation diagrams. contacts.Main Summary Index
Limit Switches
Plastic Metal Casing
Terminology
Double Insulation S
Class materials, according IEC 536, are designed with double insulation..O. For the part travel that separates the contacts, there must positive drive, with resilient member (e.
Positive Opening Operation ©
A control switch, with one more break-contact elements, has positive opening operation when the switch actuator ensures full contact opening
of the break-contact. _
T r
State rest
m i
Completely closed
Contact shape according IEC 947-5-1.
DC-13: switching electromagnets using direct courant.
n
IQJ
State rest
D
^ i
Contact change
\m m
i
Positive opening
Slow Action
Slow action contacts are characterised release position that the same the operating position.
Minimum Actuation Force/Torque
The minimum amount force/torque that applied the switch actuator produce change contact position.
Every control switch with positive opening operation must indelibly marked the outside with the symbol: .
Control switches with positive opening operation may provided with either snap action slow action contact elements.
T 4
-14I 1
Za ”!14l 1
Zb
Contacts with the same polarity The moving contacts are electrically separated
Utilization Category
AC-15: switching electromagnetic loads electromagnets using alternating current (>72 VA). Snap breaking of
moving contacts independent the switch actuator's speed and contributes regular electric performance even for slow switch actuator speeds. This measure consists doubling the functional insulation with an
additional layer insulation eliminate the risk electric shock and thus not having protect elsewhere.
Minimum Force/Torque achieve Positive Opening Operation
The minimum amount force/torque that applied the switch actuator ensure positive opening operation the N. springs),
between the moving contacts and the point the actuator which the actuating force applied. use several contacts
on the same control switch with positive opening operation, they must electrically separated from each other, not, only one may used.
Change-over contact elements with terminals must indelibly marked with the corresponding symbol the diagrams below.g. conductive part "double
insulated" material should connected protective conductor. page page 58• Standards
56
1SBC QQ16 R1QQ2
Main Summary
L lta cts
. contact.
Snap Action
Snap action contacts are characterised release position that distinct from the operating position (differential travel).C.
The positive opening operation does not deal with N. The switch actuator's speed directly
conditions the travel speed contacts.
Terminals
Limit switches with metal casings must have terminal, for protective conductor, that placed inside the casing very close the cable inlet and
must indelibly marked
