RS Series
Precision Current Resistor / DC Current Shunts
•
•
•
•
•
•
Base Mounted Shunt*
Current Rating 5 to 1200 Amps
50mV, 100mV, or Custom Output
Standard Tolerance ±0.25%
Manganin Resistive Element
Common Applications:
Solar Generators, Wind Power,
Heavy Industry, Electroplating,
Battery Chargers, Mining
*Available without Baseplate
SPECIFICATIONS
Type
RSA-5
RSA-10
RSA-15
RSA-20
RSA-30
RSA-50
RSA-75
RSA-80
RSA-85
RSA-100
RSA-150
RSB-170
RSB-200
RSB-250
RSB-300
RSB-400
RSB-450
RSB-500
RSB-600
RSC-800
RSC-1000
RSC-1200
Rated
Current (A)
5
10
15
20
30
50
75
80
85
100
150
170
200
250
300
400
450
500
600
800
1000
1200
Operating
Current (A)
3.33
6.67
10
13.3
20
33.3
50
53.3
56.7
66.7
100
113
133
166
200
267
300
333
400
533
666
800
Resistance (m
)
50mV Output
10.00
5.00
3.333
2.500
1.667
1.000
0.667
0.625
0.588
0.500
0.3333
0.2941
0.2500
0.2000
0.1667
0.1250
0.1111
0.1000
0.0833
0.0625
0.0500
0.0417
Resistance (m
)
100mV Output
20.00
10.00
6.667
5.000
3.333
2.000
1.333
1.250
1.176
1.000
0.6667
0.5882
0.5000
0.4000
0.3333
0.2500
0.2222
0.2000
0.1667
0.1250
0.1000
0.0833
RSC
RSB
RSA
Drawing
Riedon Inc.
©
Riedon, Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201804_003
RS Series
Precision Current Resistor / DC Current Shunts
SPECIFICATIONS
Rated Output
Voltage Tolerance
Operating Temp.
Storage Temp.
Dielectric Strength
50mV, 100mV, Custom
±0.25% Standard
±0.1% Available
( Contact Factory)
-40°C to +60°C
-55°C to 80°C
750VDC
( Terminal Block to Base)
Resistance Element: Manganin
Terminal Block RSA & RSB: Brass
Terminal Block RSC: Copper
Hardware: Brass
Solder: Lead Free Standard, Lead on Request
Built to A-A-55524, Commercial Version of MIL-S-61B
Calibrated on Certified N.I.S.T Equipment
Materials
Military Spec
Ordering Information
Part Description: Part Type - Rated Current - Voltage Output (mV) - NB (no baseplate option)
Example:
RSA-100-50
or
RSA-100-50-NB
without baseplate
Riedon Inc.
©
Riedon, Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201804_003
RS Series
Precision Current Resistor / 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 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.
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.
©
Riedon, Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
www.riedon.com
sales@riedon.com
(626) 284-1704
Revised: 201804_003
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