Powering a crane/claw
They SAY


  Crane Machine Claw Coil for 24 to 48 volt (20 ohm) claws
  Wiring Notes:
  This claw coil comes with four wires:Red, White, Blue and Yellow.
  1. The yellow and Blue get wired together
  2. The Red and White get wired together
  This make the two wire connection needed for both 24v to 48v AC claw units.
  The strength of the claw is normally adjustable by the voltage from the claw machine PCB board.  


If I was "playing" with this and decided to try and make it work rather than asking the supplier or returning it, then - 

I'd assume that this


  
  The yellow and Blue get wired together  
  The Red and White get wired together
  This make the two wire connection needed for both 24v to 48v AC claw units.  
  


Had (probably) effectively been done and that I had a 24-48V unit.

I'd measure coil resistance.
20 Ohms? - adds to above conclusion.
10 - 15 Ohms ? - Hmmm. 
30 - + Ohms -> unhappy
Under 10 Ohms -> unhappy.

I'd try 24V.
If this was strong enough I'd check for manifest overheating for periods far longer than expected use.
If it worked well enough and not over say 40C over long periods, good enough.

If 24V not adequate, I'd use a 24V - 48V supply to investigate strength and heating.  

Using DC - power = V^2/R.
If 20 Ohms then 48V = 2.4 Amps &amp;  about 125 Watts.
I'd expect that to get very hot "rather quickly".

The lower voltage that had acceptable strength the better.
Long term operation at more or much more than say 50 degrees C MAY be OK, but I'd not risk it. 

An arcade machine operator may be able to assist.
If you ARE an arcade machine operator, measuring the voltage used on a similar device may help.

AC will probably make a significant difference to the above.