RSN Series
DC Ammeter Shunts / Busbar Shunts
1 Amp - 500 Amp
•
•
•
•
•
1 Amp to 500 Amp
0.1% Tolerance
Manganin Resistive Element
Calibration Certificate Available
Common Application:
Power Supply
Power Converters
Current Measurements
SPECIFICATIONS
Type
RSN-1
RSN-2
RSN-5
RSN-10
RSN-20
RSN-50
RSN-100
RSN-150
RSN-200
RSN-250
RSN-300
RSN-400
RSN-500
Rated
Current (A)
1
2
5
10
20
50
100
150
200
250
300
400
500
Operating
Current (A)
0.667
1.33
3.33
6.67
13.33
33.33
66.67
100
133.33
166.67
200
266.67
333.33
Resistance (m
Ω
)
50mV Output
50
25
10
5.0
2.5
1.0
0.5
0.333
0.25
0.20
0.167
0.125
0.10
Resistance (m
Ω
)
100mV Output
100
50
20
10
5.0
2.0
1.0
0.667
0.50
0.40
0.333
0.25
0.20
SPECIFICATIONS
Rated Output
Voltage Tolerance
Operating Temp.
Storage Temp.
Materials
50mV, 100mV, Custom
% Change of Resistance
Manganin Temperature Coe cient of Resistance ±15 PPM/C
+0.04
+0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
-0.12
10
20
30
40
50
60
70
80
90
100
±0.1%
30°C to 70°C
-55°C to 80°C
Resistance Element: Manganin
Terminal Block RSN: Brass
Base: Bakelite
Temperature °C
*Applies to resistance element only
Operating Current Derating:
For continuous operation, it is recommended that shunts are not run at more than
two thirds (2/3) the rated current under normal conditions per IEEE standards for DC instrument shunts. At ambient
temperatures above 40°C, the current must be further derated to prevent damage.
Riedon Inc.
02/17
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
RSN Series
DC Ammeter Shunts / Busbar Shunts
1 Amp - 500 Amp
TECHNICAL NOTES
Mounting:
Shunts should be mounted with manganin resistive blades in a vertical position in order to
promote the free convectional flow of air. If vertical mounting is not practical, forced air cooling or adding
heat sinks to the blocks can reduce the operating temperature. The manganin blades must never exceed
+145°C, otherwise permanent resistance change may occur.
When current of 100A or greater is passing through the shunt, the major portion of heat generated is dis-
sipated by conduction through the shunt terminal blocks into the connecting buss bar or cable. Therefore
it is necessary to insure that good contact is made between the shunt terminal blocks and the conductor
terminals and that the conductors have adequate cross section to keep the temperature of the shunt from
exceeding 145°C ( 125°C recommended ).
If the shunt is mounted in an enclosure, care must be taken to ensure adequate cooling. If the power density
is greater than 1/4 watt per square inch of the enclosure surface for all enclosed devices, additional cooling
must be supplied in the form of air vents or fans.
Shunts also must be installed in a way that protects them from thermal expansion forces produced from
buss bar or short-circuit forces. Flexible wiring may be required in high pulse current, high vibration, or high
temperature applications.
Where possible, all shunts should be mounted on the ground side of the circuit. For circuits above 750VDC,
RS shunts
must
be mounted on the ground side due to the dielectric strength of the shunt base.
Mounting Orientation
UP
Current
Current
Output Voltage
Operating Current Derating:
For continuous operation, it is recommended that shunts are not run at more
than two thirds (2/3) the rated current under normal conditions per IEEE standards for DC instrument shunts.
At ambient temperatures above 40°C, the current must be further derated to prevent damage.
Pulse Operation:
Shunts that do not need continuous operation and are only exposed to intermittent pulses
can be operated at levels above their rated current for short periods of times. Pulses are limited to the
maximum temperature of the blades not exceeding 145°C ( 125°C recommended ). Many variables such as
ambient temperature, cross section of the current carrying conductors, and pulse duration make calculating
exact values difficult. Shunt size will need to be validated by customer for pulse current and duty cycle on a
case by case basis.
Riedon Inc.
02/17
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
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