# relay coil voltage drop

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How would you measure the voltage drop across the relay coil? The voltage drop across a relay coil will be the same as the coil supply voltage. If you are trying to see if the coil is good or not, remove one of the voltage supply leads and check for... How to Test the Voltage Drop of a Relay Contact AVI OnDemand Maximum allowable voltage drop for any relay or switch contact is 300mV (.300V). If you want to test the contact resistance with an ohmmeter instead of doing this test, pull the relay, hot wire the coil to bring the switch contacts together, then check the resistance between (in this style relay) 30 and 87. 12V relay voltage drop | Electronics Forum (Circuits ... Based on those numbers, that puts the coil resistance at 48 Ohms. Therefore would it be safe to assume that my 12v dc relay, at 250mA, will in fact drop a full 12v across the coil when active? The reason I ask, is because, if I have a 13v dc power supply to run the relay, and it is a 12v relay @ 250mA, then 13v 12v = 1v. Relay: Minimum switching voltage Electrical Engineering ... you don't specify whether you mean across the coil or contacts, so the answer could be no or yes! | "voltage drop on the relay" "on" (I guess you mean across) could refer to the coil or the contacts). Deﬁnition of Relay Terminology Digi Key Deﬁnition of Relay Terminology COIL (also referred to as primary or input) • Nominal Coil Voltage (Rated Coil Voltage) A single value (or narrow range) of source voltage intended by design to be applied to the coil or input. • Pick Up Voltage (Pull In Voltage or Must Operate Voltage) As the voltage on an unoperated relay is What Is Pull in Voltage? | Sciencing The pull in voltage and the drop out voltage each have an associated operating current. This current flows through the relay coil and induces the magnetic field required to actuate the relay and change its state. This current is equal to voltage across the relay coil, divided be the resistance of the coil. Electrical Relay and Solid State Relays for Switching As the output switching device of a solid state relay is a semiconductor device (Transistor for DC switching applications, or a Triac Thyristor combination for AC switching), the voltage drop across the output terminals of an SSR when “ON” is much higher than that of the electromechanical relay, typically 1.5 – 2.0 volts. Typical contact verification circuit. • Insert a voltmeter in parallel with the relay contacts to measure the voltage drop across the contacts • With the power supply on: • Operate (or release) the relay coil at nominal voltage (i.e. close the contacts under test) Typical contact resistance circuit. K1 = Relay contact tested. V1 = Minimum rated voltage.