Amperage On The Contactor Side Of Contactor

[Seven-Delta-FortyOne]

Common Contactor for say, a 1HP water pump. Line voltage Contactor.

How do you determine amperage on the Contactor side, in order to figure for voltage drop, for example?

I’ve seen figures of 3-5 amps, less for holding.

Is this info published by the Contactor manufacturer, or is it a standard amount?

 

[winnie]

You need to get the datasheet from the manufacturer. Somewhere in there you will see something like 'coil characteristics'. 3-5 amps is probably for a huge contactor, not a tiny 1HP one.

See for example on page 4: https://cdn.automationdirect.com/static/specs/fujimc9150.pdf

Per page 1, SC-E02P-110VAC is rated for a 1 HP 240V motor with a 110V AC coil. Per page 4 that contactor requires 95 VA to pull in and 9 VA once 'sealed'. So less than 1A to initially activate, then less than 0.1A to stay on.

-Jonathan