Cut Sheet

V8-T1-2 Volume 8—Sensing Solutions CA08100010E—January 2015 www.eaton.com
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Safety Products
Introduction
Technical Reference
LS-Titan To protect personnel and
equipment, often the need
arises for a device to provide
a signal indicating that a door
or a panel has been closed
before a machine can be
turned on or operations can
be restarted.
While a standard limit switch
or sensor may be able to do
this function, the possibility
exists that the unit could
be false tripped or false
actuated either accidently
or deliberately, thereby
posing a danger to the
machine operator.
In response to this problem,
many switch manufacturers
offer safety-rated interlock
switches.
Designed with two parts—
the sensor and the actuator,
the sensor is typically
mounted on the stationary
portion of a structure and
the actuator is mounted on
the movable portion. The
sensor is designed to work
with the correct actuator
(keyed or coded magnet)
to reduce tampering and
increase safety.
Interlock Switch
Actuation of the interlock
switch occurs only when the
corresponding key is inserted
into the key slot. The key is
usually mounted on a door
or machine guard in such a
way that when the door or
the guard is closed, the key
fits into the slot actuating the
switch. The special key
design makes the safety
interlock switch extremely
difficult to defeat. When
inserted into the slot, the
key performs three separate
mechanical functions.
In addition to being difficult to
override, the safety interlock
is also designed to fail to a
safe mode. If, by chance, the
contacts were to become
welded together, removal of
the key will physically tear the
contacts apart, resulting in a
safe condition.
LS-Titan™ key interlock
switches by Eaton’s Electrical
Sector are available in both
NEMA
®
and DIN style
housings. NEMA style key
interlock switches feature
durable metal housings,
which remove power to the
machine when the guard is
opened.
DIN style key interlock
switches feature a reduced
size and economical plastic
housings. They remove
power to the machine when
the guard is opened.
Non-Contact Interlock
Switch
Activation of the non-contact
interlock switch occurs only
when the corresponding
magnetic actuator is within
operating range. The actuator
is usually mounted on a door
or machine guard in such a
way that when the door or
the guard is closed, the
actuator is within operating
range and actuates the
sensor. The design of the
sensor/actuator combination
reduces the likelihood of
defeating the sensor with a
simple magnet.
Key Slot
Key