Specifications

DC Ammeters
Mechanical Indicators
45
Specifications
Accuracy
Rated voltage
Rated current
Structure
Voltage test
Insulation resistance
Grade 0.5 Percentage with respect to the rated voltage drop between voltage terminals or the shunt resistance value when the consumption current of the indicator is ignored.
60mV (standard), 100mV (quasi-standard)
1~7500A
Shunt with base for 150A or less, shunt without base for 200A or more.
3320VAC for 5s (applies only to shunts with base)
10MΩ or more at test voltage of 500V (applies only to shunts with base)
Shunt for DC ammeter
Accessories
Rating selection and mounting
1. Rating selection
For the shunt rating, select a current value with adequate allowance, taking into
consideration that a shunt is a heat source. (As a general rule, use a shunt for
values approximately 1.5 times or more of the continuous operating current.)
2. Mounting attitude
Mount the shunt as shown in the diagram.
3. Voltage terminals
Two voltage terminals are provided at one side block for shunts with a voltage of
2000A or more. In this case, use the diagonally positioned voltage terminal.
(Error may increase by approximately 0.5% when the voltage terminals are used
in parallel.)
Passage
of air
50cm or
more
Passage
of air
(Floor)
Vertical mounting for
best natural heat radiation
Outer dimensions
Fig. 1 1~5A (60mV, 100mV) Fig. 2 10~150A (60mV, 100mV) Fig. 3 200~300A (60mV, 100mV)
Fig. 4 400~1000A (60mV)
400~750A (100mV)
H
W
Q
P
S
R
d
D
Bus
line
Fig. 5 1200~1500A (60mV)
1000~1500A (100mV)
H
P
S
R
d
D
W
Q
Bus
line
Fig. 6 2000~3000A (60mV, 100mV)
P
Number of sheets at
current terminal: 3
H
6
R
S
E
W
Q
d
D
Bus
line
Fig. 7 4000~7500A (60mV, 100mV)
H
W
P
Bus
line
R
S
R
dD
f
H
W
P
Bus
line
R
S
R
dD
f
dD
H
W
R
P
S
Bus
line
H
W
P
S
R
d
D
Bus
line
Remarks
(1) For low-current shunts, the influence of the consumption current may be significant in some cases. If a shunt is ordered separately, it may be necessary to
adjust the indicator that is used in combination with it.
(2) Shunts are designed for a temperature rise limit of 80°C at a current that is 80% of the rated current. For this reason, adequate care is required when
tightening the bus lines in high-current, large-loss applications.
(3) Shunts with an insulating base can also be manufactured for rated currents greater than 150A and 600A or less.