IEC style contactor coils are marked with the labels of

• A. Coil 1 & Coil 2
• B. L1 & L2
• C. A1 & A2
• D. X1 & X2

Answer: (C)

In IEC-style devices, the coil terminals are identified as A1 and A2. This labeling clearly marks the two ends of the control coil, separating the control circuit from the main power circuit. A1 is typically the active or positive side in a DC control circuit, with A2 being the return, but the exact polarity is not critical for AC coils. The other labels correspond to different parts or conventions: main power terminals are usually L1/L2 (and sometimes others for three-phase), there isn’t a standard use of Coil 1 & Coil 2 for a single coil, and X1/X2 isn’t the standard coil designation. So A1 and A2 is the correct and standard way to mark the coil terminals.