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 (m ? ) 50mv output resistance (m ? ) 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 rsc rsc-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. -40c to +60c storage temp. -55c to 80c 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 certi? 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 seriesprecision current / dc current shunts
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 08/16 www.riedon.com rs seriesprecision 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 . 5 6 3 1 4 . 3 h e x 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 . 4 3 8 1 1 . 1 h e x 1/4-28 nut
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 08/16 www.riedon.com rs seriesprecision 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 ? ow of air. if vertical mounting is not practical, forced ai r cooling or adding heat sinks to the blocks can reduce the operating temperature. the manganin blades must never exceed +145c, 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 145c ( 125c 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 40c, 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 145c ( 125c recommended ). many variables such as ambient temperature, cross section of the current carrying conductors, and pulse duration make calculating exact values dif? cult. shunt size will need to be validated by customer for p ulse current and duty cycle on a case by case basis.
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