Page 1
Hubbell Industrial Controls, Inc.
QUICK BREAK POWER LIMIT SWITCH
General Information
Euclid quick break limit switches for
hoists are normally closed by the
weight of the striking lever. The
movement of the lever on its upward
travel, when engaged by the hoist
hook block on its upward travel,
causes the switch to quickly break the
circuit to the motor with very little upward movement of the crane hook.
The switch is automatically reset by
the weight of the striking lever when
the hook is lowered.
♦ NEMA & CEMA ratings 1, 3, 4, 9
general purpose, weather proof, watertight, explosion-proof enclosures.
♦ Mill duty construction.
♦ Reversible finger tips and seg-
ments for longer life.
♦ Easy maintenance and access to
fingers, contact tips, drum segments
and tension springs.
♦ Moving and stationary contacts
are made from hard drawn copper.
♦ Automatic reset.
Application
Euclid quick break hoist limit switches
are used with reversing drum and
magnetic controllers on cranes and
hoists, either as a main line limit
switch or as a pilot circuit limit switch
to operate magnetic contactors in
main line motor circuits.
CATALOG
NUMBER
Description
There are two general types of main
line limit switches - - - the standard
and the plugging type. The plugging
limit switch utilizes the motor to stop
the upward travel by plugging the motor when the limit switch is tripped.
This is accomplished by the switch
quickly reversing two lines of the motor, plugging it to a stop and then lowering the hook until the limit switch
resets. Some motors require plugging
resistors when such a limit switch is
AC & DC HOIST MOTOR APPLICATIONS
MAXIMUM HORSEPOWER RATINGS
AC DC
220
VOLTS
440-550
VOLTS
115
VOLTS
NON-PLUGGING DUTY
230
VOLTS
Specification
4225
February 2006
Repl.: Nov. 1986
Schedule E5
used. Consult our representative or
the factory for recommendations on
such applications.
All switches in the line are furnished
with reversible finger tips that can be
easily replaced. The drum segments
are easily replaced. Both the finger
tips and segments are made of harddrawn copper. Tension is maintained
on the fingers by means of high quality
tension springs that are easily replaced.
NO.
OF
POLES
4225-LS-900
4225-LS-1950B
4225-LS-312
3
10
25
3
10
25
1
2.5
5
2
5
10
3
3
3
Page 2
APPROXIMATE DIMENSIONS
(NEMA 1 ENCLOSED)*
Three Pole Non-Plugging Type – A.C.
4225-LS-900
4225-LS-1950B
4225-LS-312 •
• Purchaser to provide striking plate & additional weight at 12” radius to reset.
* NEMA 3, 4, 9 enclosure dimensions available upon request.
1 8-7/16” 1-13/16” 1-5/8” 3-15/16” 9-1/8” - - - - - - - - - - - - - - - 2 Pounds 20
2 9-3/4” 2-3/8” - - - - - 4-1/2” 10-1/4” - - - - - - - - - - - - - - - 5 Pounds 34
3 11-3/4” 3” 4” 6-1/4” 13” 4-1/4” 4-1/4” 8-1/2” 30 Pounds 60
Hubbell Industrial Controls, Inc.
a subsidiary of Hubbell Inc.
4301 Cheyenne Dr., Archdale, NC 27263
Telephone (336) 434-2800 • FAX (336) 434-2803
http://www.hubbell-icd.com
sales@hubbell-icd.com
Loading...