CloSure™ Test
Introductione:
The CloSure™ Test is a simple yet
extremely effective means to determine and monitor
the ability of the mechanism to close the circuit breaker
contacts fully. It provides a quantitative measure of the
extra energy available in terms of over travel in inches
to close the circuit breaker contacts to their full extent.
It may be used periodically to monitor the health of the
mechanism.
At times, circuit breakers are called upon to operate
MOC (Mechanism Operated Control) switches that
place extra load upon the closing mechanism of the
circuit breaker. If this load is excessive, it can prevent
the circuit breaker from closing fully. In such a case, it is
important to determine that the circuit breaker will close
fully. The CloSure™ Test provides this assurance.
General Informatione:
If the CloSure™ travel obtained
is as specified, the mechanism performance is
satisfactory. If the CloSure™ travel does not conform as
shown in the demonstration, contact Eaton for further
information.
WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE OR TESTS ON THE EQUIPMENT WHILE
IT IS ENERGIZED. NEVER PUT YOUR HANDS NEAR THE
MECHANISM WHEN THE CIRCUIT BREAKER IS IN THE
CHARGED OR CLOSED POSITION. DEATH OR SEVERE
PERSONAL INJURY CAN RESULT FROM CONTACT WITH
ENERGIZED EQUIPMENT. ALWAYS VERIFY THAT NO
VOLTAGE IS PRESENT BEFORE PROCEEDING WITH THE
TASK, AND ALWAYS FOLLOW GENERALLY ACCEPTED
SAFETY PROCEDURES.
Safety Precautionse:
Read and understand the
instruction manual for specific instructions before
attempting any maintenance, repair or testing on the
circuit breaker. The user is cautioned to observe all
recommendations, warnings and cautions relating to the
safety of personnel and equipment.
The recommendations and information contained herein
are based on experience and judgment, but should
not be considered to be all-inclusive or covering every
application or circumstance which may arise. If further
information is required, you should consult an Eaton
Electrical Services and Systems representative.
Testing Procedurese:
Assuming that the circuit breaker
is safely removed from the switchgear enclosure and
positioned in an area outside the arc fault boundary,
follow this procedure to perform the CloSure™ test. For
further instructions on removal of the circuit breaker
from the switchgear, refer to the appropriate section of
the instruction manual.
Table 5. CloSure™ Tool Mounting / Testing Hole Locations
Circuit breaker
LINE
APPROXIMATE
MECHANISM
CABINET
WIDTH (INCH)
UPPER
MOUNTING
HOLE
LOWER
MOUNTING
HOLE
MARKER
PLACEMENT
HOLE
18WR
20WR
29WR
18
20
27
A1
A1
A1
B2
B2
B2
C1
C2
C5
CloSure™ Tool Showing Mounting / Testing Hole
Locations (6352C49H01)
Illustrative Testing Tape Sample
(Illustration not to scale)
A-1
A-2
A-3
A-4
B-1
B-2
C-2
C-3
C-4
C-5
C-6
C-1
"X" Inches
Date / # of Breaker Operations / CloSure Distance
TM
CloSure Distance
TM
* Note:
Use the center of the marker diameter to determine "X" distance
8.0
” to
10
”
5
3/16"
Approx
otee:
N
18WR element shown.
11
EATON
| Visual Instruction Booklet Essentials | DST-2-VR - 18WR Element | May 2017
