SIEMENS
4/19
Siemens IK PI · 2015
AS-Interface
ASIsafe
3SF1 mechanical safety switches with separate actuator
4
■
Overview
The 3SF1 safety switches with safety-related communication can
be directly connected using the AS-Interface bus system. The
safety functions no longer have to be conventionally wired up.
With the 3SF1 safety switches the ASIsafe electronics compo-
nent is integrated in the switch enclosure.
3SF1 safety switches head with separate actuator and with
integrated ASIsafe electronics
The 3SF1 safety switches with separate actuator have the same
enclosure as standard switches.
Operation
The actuator head is included in the scope of supply. For actua-
tion from four directions it can be adjusted through 4 × 90°. The
switches can also be approached from above.
The actuator is not included in the scope of supply of the safety
switch and must be ordered separately. There are six variants to
choose from, depending on the application.
The actuator is encoded. Simple overruling by hand or auxiliary
devices is impossible.
A high-grade steel blocking insert for attaching up to eight
padlocks is available for even more safety.
A rubber cap to protect the actuator entry of the actuator head
from contamination is available for operation of the enclosures in
dusty environments.
Display
The switches have a status display with three LEDs:
•
LED 1 (yellow):
F-IN1
•
LED 2 (yellow):
F-IN2
•
LED 3 (green/red): AS-i/FAULT
Connection
Connection to the AS-Interface is by means of a 4-pole M12
connector socket (plastic version) connected to the yellow
AS-Interface bus cable.
The wide enclosures (50 or 56 mm) also have an M12 socket for
connecting a second safety switch. Category 4 according to
ISO 13849-1 is thus achieved.
Benefits
The new generation of 3SF1 safety switches with separate
actuator offers
•
ASIsafe electronics component integrated in the enclosure,
with low power consumption < 60 mA
•
An extensive range of actuators
•
Status display with three LEDs
Operating conditions
Safety switches with separate actuator are used where the
position of doors, covers or protective grilles must be monitored
for safety reasons.
The safety switch can only be operated with the matching coded
actuator. Simple overruling by hand or auxiliary devices is
impossible.
Devices are available with enclosure versions to suit the
particular ambient conditions. Different control tasks can be
performed with the best contact blocks suited for the particular
purpose. Dimensions and fixing points of the enclosure are in
accordance with EN 50041 or EN 50047 standards.
The devices are suitable for use in any climate.
Standards
The switches comply with the standards IEC 60947-1 (Low-Volt-
age Switchgear and Controlgear, General) and IEC 60947-5-1
(Electromechanical Control Circuit Devices).
The mechanical design of the switches corresponds to the
requirements of the fail-safe principle according to EN 1088.
Approvals
AS-Interface according to EN 50295 and IEC 62026-2.
With a 3SF1 safety switch it is possible to achieve Category 3
according to ISO 13849-1 or SIL 2 according to IEC 61508.
Category 4 according to ISO 13849-1 or SIL 3 according to
IEC 61508 can be achieved by using an additional 3SE5 safety
switch.
The 3SF1 safety switches are approved according to UL 508,
UL 50 and UL 746-C.
© Siemens AG 2014