What Are Shunt Resistors?
Shunt Resistor
Shunt resistors are usually associated a parallel position along with an instrument or the component. This is done to divert an electrical current. These have been providing the alternative paths for current just in case there is failure and may be utilized to complete the reduction in the sensitivity of input from an input line going to the ground.Current shunt resistors were generally low in resistance and passive electronic devices used to measure AC (alternating current) and DC (direct current) going through the voltage drop in which currents created throughout resistance.
Shunt resistor electrical specifications include power rating, temperature coefficient of the resistance, resistance tolerance, current rating, ohms, and power rating. Ohm is measuring the opposition of the material to the electricity circuit flow while the TCR or temperature coefficient of resistance is referring to resistance change with temperature change.
Shunt Current Sensor
On the other hand, the PCR or power coefficient of resistance refers to the temperature that had risen due to self-heating. For the current-sensing shunts, the resistance usually ranges from 100 µO up to 500 mO. A shunt resistor can be applied in current conversion. This is the aspect in which high precision has been required. The physical specifications for the shunt resistors involve resistor materials and lead type. The shunt resistors may be bolted, surface mounted, through-hole mounted, and chassis mounted. THT or the through-hole technology and SMT or the surface mount technology are both other popular and common mounting styles. The other kinds of lead are screw terminals, J-leads, and tab terminals. There are also gull-wing leads, radial leads, and axial leads available.
The shunt resistors that have no leads have been also available and the choices are thick film, wire wound, thin film, metal alloy, metal film, ceramic, carbon film, and metal oxide. Carbon shunt resistors were composed of resistive, ceramic, solid and high temperature materials that were bonded by metal contacts.
DC Current Shunts
Metal allow shunt resistors have 2 or more elements while a wirewound shunt resistor has thin wire winding in a ceramic rod. Shunt resistors differ in terms of packing methods because some passive electronic elements are packed in the reel tape assemblies along with a carrier tape which embossed cavities for storing individual component. Some were packed in trails (trays) have been composed of fiber and carbon-power materials while they have been molded in a rectangular outline containing matrices of pockets that are uniformly spaced.