American Magnetics Current Leads for Cryogenic Systems Manual User Manual
Page 4
Rev. 5, July 2003
Page 4 of 10
TABLE 1
HELIUM VAPOR COOLED CURRENT LEAD SPECIFICATIONS
Model Number
L-50
L-75
L-100
L-150
L-200
L-250
L-500 L-1000 L-2000 L-3000 L-5000 L-10000
Amperes
50
75
100
150
200
250
500
1000
2000
3000
5000
10000
Approx. Helium Consumption,
Liters/Hr., (pair of leads)
0.16
0.24
0.32
0.48
0.64
0.8
1.6
3.2
6.4
9.6
16.0
32.0
Type
A
A
A
A
A
A
A
B
B
B
B
B
A
1/4
1/4
1/4
1/4
3/8
3/8
1/2
1/2
1/2
1/2
3/4
3/4
B
1-1/2
1-1/2
1-1/2
1-1/2
2
2
3
3
3
3-3/4
4-1/2
7
C
1
1
1
1
1-1/4
1-1/4
1-1/2
2
2-1/2
3
3
3-1/2
D
--
--
--
--
--
--
--
1
1
1-1/2
1-1/2
2
E
9/32
9/32
9/32
9/32
9/32
9/32
9/16
9/32
7/16
7/16
7/16
7/16
F
3/8
3/8
3/8
3/8
1/2
1/2
3/4
3/4
3/4
1
1
1 & 3
G
3/8
3/8
3/8
3/8
1/2
1/2
1/2
7/8
1-1/8
1-1/4
1-1/2
2-1/2
H
1/4
1/4
1/4
1/4
3/8
3/8
1/2
1/2
3/4
1
1
1-3/4
I
--
--
--
--
--
--
--
2-1/4
2-1/2
2-5/8
3
3-3/4
J
--
--
--
--
--
--
--
1-3/4
2
2-1/8
2-1/4
3-1/4
K
1/4
NPT
1/4
NPT
1/4
NPT
1/4
NPT
3/8
NPT
3/8
NPT
1/2
NPT
1
1-1/4
1-3/8
1-5/8
--
L
7/8
7/8
7/8
7/8
1
1
1-3/16
5/8
5/8
5/8
5/8
3/8
M
9/16
9/16
9/16
9/16
9/16
9/16
3/4
3/8
3/8
3/8
3/8
--
N
--
--
--
--
--
--
--
9/32
9/32
9/32
9/32
9/32
O
1/4
1/4
1/4
1/4
3/8
3/8
1/2
3/4
1
1-1/8
1-3/8
2-1/8
R
--
--
--
--
0.201
0.201
0.201
9/32
13/32
17/32
17/32
3/8
S
1
1
1
1
1
1
1
1-1/2
1-1/2
1-1/2
1-1/2
4
T
1/16
1/16
1/16
1/16
1/8
1/8
1/8
1/4
1/4
1/4
1/4
3/8
U
--
--
--
--
1/4
1/4
1/4
1/2
1/2
1/2
1/2
1 &
2-1/2
V
16-5/8
16-5/8
16-5/8
16-5/8
16-5/8
16-5/8
17-1/2
19-1/2
19-1/2
19-1/2
19-1/2
24
W
Adjust. Adjust. Adjust. Adjust. Adjust. Adjust. Adjust.
1-1/2
2
2
2
4
X
1/4
1/4
1/4
1/4
3/8
3/8
1/2
3/4
1
1-1/8
1-3/8
2-1/8
D
IM
E
N
SI
O
N
S
IN
IN
C
H
E
S
Y
5/8
5/8
5/8
5/8
1/2
1/2
1/2
3/4
1
1
1
1
Note: Helium consumption is approximately 3.2 x 10
-3
liters per hour per ampere for a pair of
leads when operated at the rated current. Helium consumption at zero current is approximately
60% of rated current consumption. Consumption rates assume the use of AMI superconducting
bus bars and fixed current leads. These specifications do not apply for breakaway current leads.
Use of water-cooled cables, resistive bus bars, improperly sized bus bars, or high contact
resistance joints may cause consumption rates to be higher than those listed above.