Power/Vac® Vacuum Circuit Breakers
CIRCUIT BREAKERS FOR 5KV-15KV APPLICATIONS USING THE ML-17 MECHANISM
NEW STANDARDS
The new Power/Vac series of circuit breakers have been
tested to the latest ANSI C37.06-2009 standard. They are
UL listed, and KEMA certified test reports are available.
This latest design is based on the proven ML-17
mechanism, which has been in use for more than
35 years. The reliability of Power/Vac has been
demonstrated by its ability to handle 63kA high
interrupting duty for nearly 20 years.
Adding to our flexibility of design, all breaker ratings
are now available with 5 cycle or 3 cycle interrupting
times. Class C2 (formerly classified as definite purpose)
capacitor switching capability is also now available,
which incorporates faster TRV values than in previous
edition of the ANSI standards.
POWER/VAC® CIRCUIT BREAKER FEATURES
Enhanced ML-17 operating mechanism
for more rugged operation. 20kA thru
63kA
Utilizes the latest in vacuum interrupter
technology which eliminates the need for
surge suppressors
All breakers now rated for K Factor = 1
All ratings now available with 5 cycle or
optional 3 cycle interrupting time
Now available with Class C2 capacitor
switching rating
• All vacuum interrupters now use the latest copper
chromium technology which minimizes current chop.
Surge suppressors are no longer required.
• All Power/Vac breakers are now rated K Factor=1
• All Power/Vac breakers now use the more robust
ML-17 or ML-17H operating mechanism.
• The ML-17 mechanism is used for both circuit
breakers and ground & test devices, which means
reduced maintenance costs, fewer spare parts
requirements, and reduced operator training.
• Breakers can be easily retrofitted into existing
lineups where older ML-18 breakers and/or MVA
rated breakers were originally supplied.
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Circuit Breaker Characteristics
Rated Withstand
Test Voltages
Rated
Maximum
Voltage
(kV)1
Nominal
ANSI
Voltage
Class
(kV)
Typical
System
Operating
Voltages
(kV)
4.16
2400
4160
4200
4.76
8.25
15
7.2
13.8
6600
6900
7200
12000
12470
13200
13800
14400
Rated
Voltage
Range
Factor,
K
1.0
1.0
1.0
Low
Frequency
rms
Voltage
(kV)
19
36
36
Crest
Impulse
Voltage
(kV)
60
95
95
Continuous
rms Current
Rating at
60 Hz
(Amperes)2
Rated Short
Circuit
Current
(Maximum
Interrupting
Capability)
(kA) 3
Rated
Interrupting
Time
(cycles)
Rated
Permissible
Tripping
Delay, Y
(Seconds)
Maximum
2 Second
Short
Time
Current
Carrying
Capability
(kA)
Peak
Close and
Latch
(2.7K
times
Short
Circuit
Rating)
(kA)
1200A
2000A
3000A
3500A
4000A
31.5
5 or 3
31.5
85
40
5 or 3
40
108
50
5 or 3
50
135
63
5 or 3
63
170
1200A
2000A
3000A
3500A
4000A
40
5 or 3
40
108
504
5 or 3
50
135
634
5 or 3
63
170
1200A
2000A
3000A
3500A
4000A
2
2
20
5 or 3
20
54
25
5 or 3
25
68
31.5
5 or 3
40
5 or 3
31.5
85
40
108
50
63
5 or 3
50
135
5 or 3
63
170
2
Notes:
1
Maximum voltage for which the breaker is designed and upper limit of operation
2
4000A rating is forced-air cooled, indoor construction only. 3500A is available in outdoor construction, but must be derated to 3250A.
3
At system operating voltages equal to or less than rated maximum voltage.
4
Available ratings in addition to the ANSI C37.06-2009 preferred ratings.
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Publication No. 06094
Powell Electrical Systems, Inc.
8550 Mosley Road
Houston, Texas 77075
713.944.6900
Powell Canada Inc.
53032 Range Road 263A
Acheson, Alberta T7X 5A5
780.948.3300
Powell (UK) Ltd.
Ripley Road
Bradford, West Yorkshire BD4 7EH
+44.(0).1274.734221
10/2015 v3
powellind.com
info@powellind.com
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