Terminal blocks are used to safeguard wires, and comprise several terminals arranged vertically. This strip of terminals helps connect wires to electrical switches as well as mains. So, it works like a connector. They find applications in control panel wiring and are connected with the circuit board directly, without using plugs. Usually, their screws are made of steel and plated with zinc. Their reeds and pins are made of nickel, phosphor bronze, tin plating, or stainless steel. Electronic Expeditors (EE USA) is known as a distributor of various brands and types of terminal blocks among many other electrical components. We source these products from known manufacturers which include Kaifeng. When buying, do check for the current and voltage IEC and UL rating respectively.