91AR50 vs 91AR500 vs 91AR500K

 
PartNumber91AR5091AR50091AR500K
DescriptionTrimmer Resistors - Through Hole 3/8inch 50 ThumbwheelTrimmer Resistors - Through Hole 3/8inch 500 ThumbwheelResistor Variable, Cermet Type, 500K Ohm, 250V, 20±% (Also Known As: 3352T-1-504)
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