Which two terminal designations mark IEC style contactor coils?

• A. L1 & L2
• B. A1 & A2
• C. X1 & X2
• D. K1 & K2

Answer: (B)

In IEC style, the coil terminals are labeled A1 and A2. These two terminals correspond to the ends of the electromagnet that, when voltage is applied to the control circuit, pulls the armature and energizes the contactor. L1 and L2 are typically the main power line terminals, not the coil; X1 and X2 are often used for auxiliary or signal connections in different diagrams; K1 and K2 are sometimes used as reference designations for relays in other conventions. So A1 and A2 are the correct coil terminals.