Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
08/16 www.riedon.com
RS Series
• 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
Precision Current / DC Current Shunts
SPECIFICATIONS
Type Rated
Current (A)
Operating
Current (A)
Resistance (mΩ)
50mV Output
Resistance (mΩ)
100mV Output Drawing
RSA-5 5 3.33 10.00 20.00
RSA
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
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
RSCRSC-1000 1000 666 0.0500 0.1000
RSC-1200 1200 800 0.0417 0.0833
Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
08/16 www.riedon.com
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 Certifi ed N.I.S.T Equipment
Part Description: Part Type - Voltage Output (mV)
Example: RSA-100-50
Ordering Information
+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
% Change of Resistance
Temperature °C
Manganin Temperature Coecient of Resistance ±15 PPM/C
RS Series
Precision Current / DC Current Shunts
Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
08/16 www.riedon.com
RS Series
Precision Current / DC Current Shunts
RSA
RSB RSC
Dimensions
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
8-32
Output 14-15 in-lbs (1.6-1.7 Nm)
3.25 82.6
1.50 38.1
2.50 63.5
0 0
.55 14
1.25 31.8
1.65 41.9
8-32 Screw
2X .205
5.2
1.75 44.5 1.25 31.8
1.63 41.3
.56314.3
HEX
4.50 114.3
2.16 54.9
3.66 93
0 0
.58 14.7
1.52 38.6
2.10 53.3
8-32 Screw
2.500 63.5
2X
.205 5.21
2.000 50.8
2.250 57.2
.750
19.
1
HEX
1/2-13 x 7/8
2.00 50.8
1.00 25.4
1.50 38.1
0 0
.56 14.2
1.04 26.4
1.67 42.3
8-32 Screw
2X
.205 5.2
1.25 31.8 .88 22.4
1.00 25.4
.43811.1
HEX
1/4-28 NUT
Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
08/16 www.riedon.com
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 fl ow 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.
Output Voltage
Current Current
Mounting Orientation
UP
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 diffi cult. Shunt size will need to be validated by customer for pulse current and duty cycle on a
case by case basis.
