Eaton Magnum DS - Page 24

Technical Data
Effective: May 1998Page 24
TD.44A.01.T.E
Cutler-Hammer
Magnum DS
Metal-Enclosed
Low-Voltage Switchgear
Application
Application of Magnum DS Power Circuit Breakers
With Standard Three-Phase Transformers – Fluid Filled and Ventilated Dry Types,
Continued
Transformer Base
(100%) Rating
Secondary Short-Circuit Currents
RMS Symmetrical Amperes
Minimum Size Breakers for Selective
Trip Systems
kVA and
Percent
Impedance
Amperes➀ Maximum Short Circuit
kVA Available from
Primary System
Through
Transformer
Only
Motor
Contribution
Combined Main
Breaker
Short Delay
Trip
Feeder
Breaker
Short Delay
Trip
Feeder
Breaker
Instantaneous
Trip
Table A3 – 480 Volts Three-Phase — 100% Motor Load
500
5-0%
601 50000
100000
150000
250000
500000
Unlimited
10000
10900
11300
11600
11800
12000
2400 12400
13300
13700
14000
14200
14400
MDS-408
➁ MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
750
5.75%
902 50000
100000
150000
250000
500000
Unlimited
12400
13900
14400
14900
15300
15700
3600 16000
17500
18000
18500
18900
19300
MDS-616 MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
1000
5.75%
1203 50000
100000
150000
250000
500000
Unlimited
15500
17800
18700
19600
20200
20900
4800 20300
22600
23500
24400
25000
25700
MDS-616
➁ MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
1500
5.75%
1804 50000
100000
150000
250000
500000
Unlimited
20600
24900
26700
28400
29800
31400
7200 27800
32100
33900
35600
37000
38600
MDS-620
➁ MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
MDS-408
2000
5.75%
2406 50000
100000
150000
250000
500000
Unlimited
24700
31000
34000
36700
39100
41800
9600 34300
40600
43600
46300
48700
51400
MDS-632
➁ MDS-408
MDS-408
MDS-608
MDS-608
MDS-608
MDS-608
MDS-408
MDS-408
MDS-608
MDS-608
MDS-608
MDS-608
2500
5.75%
3008 50000
100000
150000
250000
500000
Unlimited
28000
36500
40500
44600
48100
52300
12000 40000
48500
52500
56600
60100
64300
MDS-632
➁ MDS-408
MDS-608
MDS-608
MDS-608
MDS-608
MDS-608
MDS-408
MDS-608
MDS-608
MDS-608
MDS-608
MDS-608
3000
5.75%
3609 50000
100000
150000
250000
500000
Unlimited
30700
41200
46600
51900
56800
62800
14000 44700
55200
60600
65900
70800
76800
MDS-840
➁ MDS-608
MDS-608
MDS-608
MDS-808
MDS-808
MDS-808
MDS-608
MDS-608
MDS-608
MDS-808
MDS-808
MDS-808
3750
5.75%
4511 50000
100000
150000
250000
500000
Unlimited
34000
47500
54700
62200
69400
78500
18000 52000
65500
72700
80200
87400
96500
MDS-850 MDS-608
MDS-808
MDS-808
MDS-808
MDS-L08
MDS-L08
MDS-608
MDS-808
MDS-808
MDS-808
MDS-C08
MDS-C08
➀ At transformer self-cooled rating.
➁ Next larger frame size main breaker may be
required for 55/65°C rise and/or forced air-
cooled (FA) transformer. Check Transformer
Secondary Ampere Rating.
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