DELTEC COMPANY RESOURCE SECTION

SHUNT SELECTION PROVISIONS
Definition

An ammeter shunt is a very low-resistance 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 MKA-100-100 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 MKA-100-50 has an approximate  resistance of 0.0005 Ohms.  This is determined by V/I=R.  (.05 V)/(100 A) = (R).

OHMS LAW
 V= I x R V = Voltage I = Amperage R = Resistance Power (WATTS) = I^2 x R

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

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