Cutler Hammer, Div of Eaton Corp E48M1K, E48KL0 Data Sheet
1-2
Product Selection
1
SAFETY
PRODUCTS
Key Interlock Switches
DIN Models
Page Page 1-4 Page 1-7
Safety Products
Overview
Applications
Safety device that is designed to be used with
movable guards or covers which must be
closed for operational safety. This switch
automatically stops the machine when the
guard is removed.
Any machine with movable guards installed to
protect machine operators from injury.
August 2007
Key Interlock Switches
NEMA Standard Models
Safety device that is designed to be used with
movable guards or covers which must be
closed for operational safety. This switch
automatically stops the machine when the
guard is removed.
Any machine with movable guards installed to
protect machine operators from injury.
Product
Features
Contact Ratings NEMA A600 (UL/CSA Pilot Duty) NEMA A600 (UL/CSA Pilot Duty)
Enclosure
Ratings
Construction
Approvals
Meet UL, European and International
■
requirements.
Actuating keys are designed to be
■
difficult to defeat, reducing the
possibility of tampering.
Removal of key positively breaks the N.C.
■
contacts — unit is designed to fail to safe
condition.
■
Cost-effective and durable plastic
construction.
■
Head can be rotated in any of four
positions.
■
Dual entry points for operation key — top
or side.
■
Conduit entry.
NEMA 4, IP65 NEMA 3, 4, 4X, 6P, 13, IP67
Synthetic Resin Aluminum Die Cast
UL Listed
TUV
Meet UL, CSA, European and
■
International requirements.
Actuating keys are designed to be
■
difficult to defeat, reducing the
possibility of tampering.
Removal of key positively breaks the N.C.
■
contacts — unit is designed to fail to safe
condition.
■
Rugged cast aluminum body for use in
harsh industrial environments.
■
Head can be rotated in any of four
positions.
■
Conduit entry.
UL Listed
CSA Certified
TUV
For more information visit: www.eaton.com
PG08301004E
S
Safety Products
August 2007
Technical Reference
Safety Interlock Switches
Often the need arises for a device
to provide a signal indicating that
a door has been closed or that a
machine guard is in place before
a machine can be turned on or a
sequence of operations can begin.
While a standard limit switch would
probably 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 person operating the machine.
In response to this problem, many
switch manufacturers offer what is
known as a key interlock switch.
These switches look and operate
similar to standard limit switches
except for the operating heads.
Instead of a rotary or plunger
operating head, there is a key slot.
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.
Cutler-Hammer Key Interlock
Switches by Eaton’s electrical
business are available in both NEMA
and DIN style housings. NEMA Style
Key Interlock Switches feature
durable metal housings, which
removes 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.
Product information for these products begins on
Page 1-4.
1-3
1
AFETY
PRODUCTS
Key Slot
Key
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 guard is
closed, the key fits into the slot
actuating the switch. The special
design of the key makes the safety
interlock switch extremely difficult to
defeat. When inserted into the slot,
the key performs three separate
mechanical functions.
PG08301004E For more information visit: www.eaton.com
1-4
1
SAFETY
PRODUCTS
Key Interlock Switches — DIN Models
PG.05F.02.T.E
Key Interlock Switches
DIN Models
Contents
Overview . . . . . . . . . . . . . . . . . . . . 1-4
Model Selection, Switches . . . . . . 1-5
Model Selection,
Actuating Keys. . . . . . . . . . . . . . . 1-5
Specifications. . . . . . . . . . . . . . . . . 1-5
Dimensions . . . . . . . . . . . . . . . . . . 1-6
The Cutler-Hammer
Safety Key Interlock Limit Switch
by Eaton’s electrical business is
designed to be used with movable
guards or covers which must be
closed for operational safety. The
key portion of the switch is affixed to
the movable door, cover or other
such guard. The switch itself is
mounted to a rigid portion of the
machine. When the guard is opened,
the key is removed from the switch,
thereby
mally closed contacts. This interrupts the control circuit, stopping
machine operation.
positively breaking
Ratings and Approvals
■
UL Listed
TUV
■
IEC 947-5-1
■
■
EN60947-5-1
NEMA A600 (UL/CSA Pilot Duty)
■
■
Direct Opening N.C. contacts per
EN60947-5-1
Double insulation
■
®
E48 DIN-Style
Safety Products
the nor-
Cost-Effective Protection for Operators of
Moving Machinery
Self-Aligning Key
Accommodates
Small Guard
Swing Radius
Vertical and
Horizontal
Keys Provide
a Perfect Fit
1/2 – 14 NPT Conduit
Entrance (Bottom)
Compact
Switch Size
Actuating Key
May Be Inserted
into Top or
Side of Unit
Head Can Be
Rotated in 90˚
Increments
Hinged Cover
Provides Easy
Wiring Access
Product Features
■
Head mechanism is designed to be difficult to defeat with common tools
Three actuating key styles for mounting flexibility
■
■
Choose from 1N.O.-1N.C. or 2N.C. DPDB contacts
1/2 – 14 NPT conduit entrance
■
■
Four unique head mounting positions
Dual entry points for actuating key — top or side
■
Tough plastic construction
■
August 2007
For the most current information
on this product, visit our web site:
www.EatonElectrical.com
For Customer Service in the U.S. call 1-877-ETN CARE (386-2273) ,
For more information visit: www.eaton.com
in Canada call 1-800-268-3578 .
For Application Assistance in the U.S. and Canada
call 1-800-426-9184 .
PG08301004E
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