RS Series

RS Series
Precision Current / DC Current Shunts
•
•
•
•
•
•
•
Base Mounted Shunt
Current Rating 5 to 1200 Amps
50mV, 100mV, or Custom Output
Standard Tolerance ±0.25%
UL Listed
Manganin Resistive Element
Common Applications:
Solar Generators, Wind Power,
Heavy Industry, Electroplating,
Battery Chargers, Mining
SPECIFICATIONS
Type
Rated
Current (A)
Operating
Current (A)
Resistance (mΩ)
50mV Output
Resistance (mΩ)
100mV Output
RSA-5
5
3.33
10.00
20.00
RSA-10
10
6.67
5.00
10.00
RSA-15
15
10
3.333
6.667
RSA-20
20
13.3
2.500
5.000
RSA-30
30
20
1.667
3.333
RSA-50
50
33.3
1.000
2.000
RSA-75
75
50
0.667
1.333
RSA-80
80
53.3
0.625
1.250
RSA-85
85
56.7
0.588
1.176
RSA-100
100
66.7
0.500
1.000
RSA-150
150
100
0.3333
0.6667
RSB-170
170
113
0.2941
0.5882
RSB-200
200
133
0.2500
0.5000
RSB-250
250
166
0.2000
0.4000
RSB-300
300
200
0.1667
0.3333
RSB-400
400
267
0.1250
0.2500
RSB-450
450
300
0.1111
0.2222
RSB-500
500
333
0.1000
0.2000
RSB-600
600
400
0.0833
0.1667
RSC-800
800
533
0.0625
0.1250
RSC-1000
1000
666
0.0500
0.1000
RSC-1200
1200
800
0.0417
0.0833
Drawing
RSA
RSB
Riedon Inc.
08/14
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
RSC
(626) 284-1704
RS Series
Precision Current / DC Current Shunts
SPECIFICATIONS
Rated Output
50mV, 100mV, Custom
Voltage Tolerance
±0.25% Standard
±0.1% Available ( Contact Factory)
Operating Temp.
-40°C to +60°C
Storage Temp.
-55°C to 80°C
Dielectric Strength
750VDC ( Terminal Block to Base)
Materials
Resistance Element: Manganin
Terminal Block RSA & RSB: Brass
Terminal Block RSC: Copper
Hardware: Brass
Solder: Lead Free Standard, Lead on Request
Military Spec
Built to A-A-55524, Commercial Version of MIL-S-61B
Calibrated on Certified N.I.S.T Equipment
UL Information
For UL-approved information, contact factory
Manganin Temperature Coefficient of Resistance ±15 PPM/C
+0.04
% Change of Resistance
+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
Temperature °C
Ordering Information
Part Description: Part Type - Voltage Output (mV)
Example: RSA-100-50
Riedon Inc.
08/14
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
RS Series
Precision Current / DC Current Shunts
Dimensions
RSA
2X
1/4-28 NUT
.205 5.2
1.25 31.8
.88 22.4
X
8
.43
1.00 25.4
HE
1.1
TYPE
Fastener Torque
Weight
RSA
3-3.33 ft-lbs (4.1-4.5 Nm)
0.1 Kg
RSB
14-15 ft-lbs (19-20 Nm)
0.3 Kg
RSC
32-35 ft-lbs (35-48 Nm)
0.9 Kg
1
1.50 38.1
1.67 42.3
8-32 Screw
1.04 26.4
8-32
Output
14-15 in-lbs (1.6-1.7 Nm)
.56 14.2
0 0
1.00 25.4
2.00 50.8
RSB
RSC
2X
3/18-16 x 5/8
.205 5.2
1/2-13 x 7/8
1.75 44.5
2X
1.25 31.8
.205 5.21
2.000 50.8
2.500 63.5
X
.3
3
.56
1.63 41.3
HE
.1
14
0
.75
X
HE
19
2.250 57.2
2.50 63.5
3.66 93
2.16 54.9
1.50 38.1
2.10 53.3
1.65 41.9
1.25 31.8
8-32 Screw
1.52 38.6
8-32 Screw
.58 14.7
.55 14
0 0
0 0
4.50 114.3
3.25 82.6
Riedon Inc.
08/14
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
RS Series
Precision Current / DC Current Shunts
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 dissipated 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.
08/14
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704