SIEMENS
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Siemens IC 10 · 2017
SIRIUS 3SE5 Mechanical Position Switches
General data
12
Contacts for every application
•
Snap-action contacts:
NC and NO contacts switch
simultaneously – regardless of the actuating speed
(
v
min
= 0.01 m/s) and contact erosion.
•
Slow-action contacts:
Difference in travel between
"NC contact opens" and "NO contact closes"; the switching
speed is the same as or proportional to the actuating speed
(
v
min
= 0.4 m/s).
•
Slow-action contacts with make-before-break:
e.g. suitable for
adding a second function to a sequence control.
Operating mechanisms for every application
Standard, rounded and roller plungers
•
Operation in direction of the plunger axis or in case of roller
plunger with bar at right angles to the plunger axis.
•
The roller plunger is recommended for lateral actuation and
relatively long overtravel.
Roller levers and angular roller levers
•
For actuators made of finely ground steel in the form of cams,
straight-edges (approach angle 30°) or cam disks.
Spring rod
•
Can be used for undefined actuations and changing starting
conditions
•
Starting from any direction is possible
Twist levers and rod actuators
•
For a high starting speeds (
v
= 1.5 m/s)
•
Variety of starting options
•
Insensitive to oil, grinding dust and coarse-grained material
•
Adjustment of the lever in increments of 10°
•
Can be adjusted with left or right switching
Fork lever
•
Switchable in two directions
•
Latching actuator
•
For reciprocating movements
Monitoring with fail-safe evaluation units from the 3SK and 3RK3 series
Note:
Taking account of certain fault exclusions (e.g. actuator
breakage), use of just one hinge switch or a switch with separate
actuator with or without tumbler up to SIL 2 or PL d is possible as
described in the table.
Since the machine manufacturer must provide proof of fault
exclusion, the component manufacturer is unable to carry out a
definitive assessment of the measures taken.
For more information,
see
.
The maximum achievable SIL or PL always depends on other
assumptions as well. Factors to be taken into account include
the DC (declaration), the CCF, and the number of actuations.
For information on the safe evaluation units and an introduction
to safety systems,
see from page 11/1
.
Safe evaluation units
Maximum achievable safety level according to type of switch
Compact
Standard
Hinge
Separate
actuator
Tumbler
3SK
3RK3
3SE54
q
3SE51 / 3SE52
q
3SE51 / 3SE52
q
3SE51 / 3SE52
q
3SE53
q
Use of only one position switch/safety switch
Monitoring with 1 contact:
1 x NC contact
SIL 1 / PL c
Monitoring with 2 contacts:
2 x NC contact or 1 x NC contact + 1 x NO contact
SIL 1 / PL c
SIL 2 / PL d
Use of a second position switch/safety switch
Standard switch
3SE51 / 3SE52
SIL 3 / PLe
Safety switch / hinge switch
3SE51 / 3SE52
Safety switches with separate actuator
3SE51 / 3SE52
Safety switches with tumbler
3SE53
© Siemens AG 2016