Final answer:
To purchase a replacement contactor, the essential information needed is the model number and coil voltage of the contactor. These details ensure compatibility and safe operation within the intended voltage range.
Step-by-step explanation:
To purchase a replacement contactor, you will need the model number and coil voltage information. The manufacturer's address and color of the contactor are not typically required. However, the weight of the contactor could be relevant for logistics purposes if you are shipping the component, but it is not essential for the purchase itself.
Model number is critical because it helps identify the exact specifications of the contactor, ensuring compatibility with your system. Similarly, knowing the coil voltage is vital because contactors are designed to operate within specific voltage ranges, and using the incorrect voltage can cause malfunctions or safety issues. Therefore, c) Model number and coil voltage is the basic information required to purchase a replacement contactor.