DELTEC COMPANY RESOURCE SECTION  


SHUNT
SELECTION PROVISIONS


Definition  
An ammeter shunt is a very lowresistance connection between two points in an electric circuit that forms an alternative path for a portion of the current. Shunt voltage drop is used in conjunction with an ammeter to measure amperage of a circuit. Commercially manufactured shunts are typically available in either 50 or 100 millivolts. 

Operation  
Continuous operating current
should not exceed 2/3 ammeter shunt rating. To ensure proper
operation the shunt temperature is in no way to exceed 145°C, as a
permanent change in resistance will occur. For example, if
continuous current for an application is 500 amps, the ammeter
shunt rating should be no less than 750 amps.
This applies to both 50 and 100 millivolt current drop. To estimate minimum standard shunt rating
required,
divide continuous application amperage by .6666. 

Amp to Volt Relationship  
Deltec DC ammeter shunts are
listed by Series Type, Amperage and Voltage Drop. For example, an
MKA100100 is a lightweight shunt,
which will drop 100 millivolts at 100 amps with Deltec
standard accuracy of plus or minus 1/4%. 66
continuous operation amps is acceptable for this shunt. 

100
millivolts = (1/1000)*(100) Volt = .1Volt


50
millivolts = (1/1000)*(50) Volt = .05 Volt


Estimating Resistance  
To estimate resistance of a Deltec Ammeter shunt one needs to apply ohms law. For example an MKA10050 has an approximate resistance of 0.0005 Ohms. This is determined by V/I=R. (.05 V)/(100 A) = (R). 

OHMS LAW 



CONVERSIONS  
To convert Fahrenheit to Celsius subtract 32 from F then multiply by 5/9. C = (F32)5/9  
To convert Celsius to Fahrenheit to Celsius multiply C by 9/5 and add 32. F = (9/5 C)+32  
SEARCH  
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