SIEMENS
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Siemens IC 10 · 2017
SIRIUS 3SE5, 3SE2 Mechanical Safety Switches
With Tumbler
General data
12
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Benefits
The new generation of 3SE53 safety switches offers:
•
More safety through higher locking forces:
- 1300 N with plastic enclosure
- 2600 N with metal enclosure
•
Various release mechanisms: Lock release, escape release
and emergency release
•
Two contact blocks each with three contacts as standard
equipment, hence fewer versions needed
•
Same dimensions for all enclosure versions:
Plastic, metal or with integrated ASIsafe
•
An extensive range of actuators
•
An optional LED status display 24 V DC, 115 V AC or 230 V AC
for all switch versions
•
Devices with ASIsafe electronics integrated in the enclosure
(see page 12/103)
•
3SE5322-1S.21-1AG4 series with high degree of protection
IP69, IP69K in accordance with IEC 60529, cover with foamed
seal
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Application
The safety switches with tumbler are exceptional safety-related
devices which prevent an unforeseen or intentional opening of
protective doors, protective grilles or other covers as long as a
dangerous situation is present (i.e. follow-on motion of the
switched-off machine).
The safety position switches with tumbler have the following
functions:
•
Enabling the machine or process with closed and locked
protective device
•
Locking the machine or process with opened protective
device
•
Position monitoring of the protective device and tumbler
Standards
The switches comply with the standards IEC 60947-1
(Low-Voltage Controlgear, General) and IEC 60947-5-1
(Electromechanical Control Devices).
The mechanical design of the switch corresponds to the require-
ments of the fail-safe principle according to EN ISO 14119.
Approvals
The switches are approved for use with locking devices
according to EN ISO 14119 and EN 292, Parts 1 and 2.
Category 3 according to EN ISO 13849-1 can be attained with a
safety switch with tumbler if the corresponding fail-safe
evaluation units are selected and correctly installed, e.g. the
3SK or 3TK28 safety relays or matching units from the ASIsafe,
SIMATIC or SINUMERIK product ranges.
Category 4 can be achieved when using an additional
3SE5 safety switch.
These switches are approved according to UL 508, UL 50 and
UL 746-C.
Tumbler
The separate actuator operates in a similar way to the coding of
a key and protects against manipulation. It transmits the locking
force to the protective device and helps to monitor its position.
There are two versions of locking:
Spring-actuated lock (closed-circuit principle)
•In the standard version, the safety switch locks by means of
spring force and releases by means of electromagnetic force.
In the case of voltage failure, it reliably prevents the protective
device from opening when machine parts are still moving.
•The switch is equipped with an auxiliary release for emergency
situations or setup mode.
•An auxiliary release which can be secured with a lock to
prevent misuse is available as a version.
Auxiliary release
Auxiliary release with lock
The 3SE5 3 safety switches are also available with an escape
release or emergency release.
•Personnel working inside the hazard zone can use the escape
release feature to manually release the tumbler without tools
from the escape side (hazardous area side) so that they can
exit the hazard area.
An intentional act (in this case pulling the
gray actuator) is required to release the locking mechanism
and restore the normal operating state.
•The emergency release enables someone in an emergency
situation to manually release the tumbler without tools from the
access side (outside the hazardous area). Releasing the lock
and restoring the normal operating state must require effort
which is comparable to repair activity: in this case disassembly
of the red actuator and resetting of the mechanical lock.
Escape release from the front
Emergency release from the back
Solenoid-locked (open-circuit principle)
•The second version offers locking by means of electromag-
netic force and release by means of spring force. This version
has an advantage when it is necessary to quickly access the
machine after a power failure occurs, or in the case of very
short coasting times.
© Siemens AG 2016