GENERAL
The compact Cooper Power
Systems two-position loadbreak/
loadmake switch is designed for
use in transformer (mineral) oil,
Envirotemp™ FR3™ fluid, or an
approved equivalent fluid-filled
"Class 1" pad-mounted
transformers or distribution
switchgear.
The switch mechanism uses a
manually charged over-toggle
stored spring assembly, which is
independent of operator speed.
The spring loaded activating
mechanism ensures quick
loadbreak or loadmake operation in
less than one cycle. The twoposition
switch incorporates a
double "O" ring shaft sealing
system and two types of mounting
systems, including a weld-in
bracket assembly, and an easy to
install ring mount system. Also
incorporated into the switch
mechanism are internal stops
which restrict the handle orientation
to only two positions.
The two-position switch is hotstick
operable and requires minimal input
torque to operate. The switch
contacts are factory assembled
and gaged to a predetermined
spring pressure to ensure uniform
contact pressure between the
contacts and the blades.
The silver-plated copper blades are
securely keyed between the vented
rotor halves which ensure proper
blade and contact alignment during
switching. All of these features make
the two-position switch a reliable,
no-maintenance switch product.
Design/Production
Tests
The two-position switch has been
tested to meet the sequential test
requirements described by IEEE
Std C37.74™-2003 standard. Tests
are also conducted on production
switches in accordance with
Cooper requirements.
• Physical Inspection
• Turn Tested (on/off/on)
• Operation Torque Verification
• Resistance Testing
0812 • Supersedes 0412 1
Electrical Apparatus
OEM Equipment
Two-Position Sidewall (Horizontal) and Cover
(Vertical) Mounted Loadbreak Switches 800-65
Figure 1.
Two-position loadbreak switch (Ring Mount and Weld-in designs shown).
TABLE 1
Ratings and Characteristics
Description Units Ratings
Rated Voltage
Maximum rating phase-to-phase kV 15.5 27.6 38 46
Maximum rating phase-to-ground kV 8.9 15.6 21.9 26.5
Power Frequency Hz 60 60 60 60
Current Rating (Continuous) A 550 400 300 65
Switching Current A 550 400 300 65
Magnetizing Interrupting Current A 21 21 10.5 10.5
Cable Charging Current A 10 25 20 15
Fault Withstand Current (Momentary)
10 cycle symmetric rms kA 12 12 12 12
10 cycle asymmetric rms kA 19.2 19.2 19.2 19.2
45 cycles symmetric rms kA 16 16 16 16
1 second symmetric rms kA 12 12 12 12
2 second symmetric rms kA 8 8 8 8
3 second symmetric rms kA 7 7 7 7
Fault Close and Latch
10 cycle symmetric rms kA 12 12 12
10 cycle asymmetric rms kA 19.2 19.2 19.2
15 cycle symmetric rms kA 12
15 cycle asymmetric rms kA 19.2
Impulse Withstand Voltage (1.2/50 μs)
To ground and between phases kV 200 200 200 200
Across open contacts kV 235 235 235 235
Power Frequency Withstand (1 minute)
To ground and between phases kV 70 70 70 70
Across open contacts kV 95 95 95 95
DC Withstand (15 minutes)
To ground, between phases and across kV 103 103 103 103
Contacts
Corona (Extinction) kV 26 26 26 26
Mechanical Life (Minimum Operations) 2,000 2,000 2,000 2,000
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