Can anyone tell me what this component is (goes to an AC motor)?
It is 3 capacitors used as noise/EMI filters, with one across the hot wire and neutral with an 'x' rating and a value of 100nF. Then 2 more capacitors with a value of 2.5nF with a 'y' rating from hot and neutral to Earth ground. They are rated for 250 VAC. The roll-off frequency is given as 1.6MHZ.

The 40174 S? maybe the part number. The last numbers are the date code.

NOTE: You need just 1 of 100nF 'x' rated tied from hot to neutral. The 2 2.5nF 'y' rated caps tie to Earth ground, then one spare lead goes to the 'hot' wire, often black in color, the other spare lead goes to neutral, often white. Earth ground is green or green with yellow stripe. These capacitors have no polarity, as they are rated for AC voltage. To be legit you should buy capacitors with the 'X' and 'Y' ratings, they are important.







simulate this circuit &ndash; Schematic created using CircuitLab