What is a Terminal Block?

A Terminal block (also called a connection terminal or terminal connector) is a modular block with an insulated frame that secures two or more wires together. It consists of a clamping component and a conducting strip. A typical simplest terminal block is as shown in the image below.  Electrical terminal blocks can be classified based on structure, device type and termination.
I. Structure Type
Single level pass-through terminal blocks | Dual-level terminal blocks | Three-level terminal blocks
II. Device Type
Ground Terminal Blocks | Fused Connection Terminals | Thermocouple Terminal Blocks | I/O Blocks and Sensor Blocks | Disconnect Terminal Blocks
III. Clamping Options
Screw terminal | Spring clamp | Push-in terminal blocks | Insulation Displacement Connector (IDC)| Barrier terminal block
IV. Power Distribution Blocks

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