This works www.replacing
compressor start devices.com or do a Google search, published 3- 9- 2008 in appliancepartspros
This article assumes an R134A domestic, fractional hp compressor.
Generally, testing with a portable scope displays a saturated core reactance of about +J2 ohms, combined, locked rotor vector sum impedance of about 5 ohms
Live wire current around 20 amps, power dissipation around 1 kwatt. Winding fusing within about 1- 2 second but never verified.
With the use of a 5 ohm ptc device, current limited to about 10 amp for aprox, 100 - 200 msec. That is a typical start scenario that compressors
The danger of a hard wired test device is if the compressor fails to start, and the start current repeated over a sufficiently short interval will result in winding
burnout. In cases where the compressor starts, there is a risk the windings can get damaged. Probably academic as the compressor is probably bad mechanically or with damaged windings, but still embarrassing.