The maximum system voltage of the application must be less than the voltage rating. The voltage rating is in part determined by the dielectric strength and pitch of the terminal block housing. It is best practice to use a terminal block that is rated for at least 150% of the max current that is expected in the system. Operating at too high of a current can cause overheating and damage of the terminal block, leading to major safety concerns. The current rating is based on the conductivity of the terminals, cross-sectional area, and the corresponding heat rise. The current rating is often the most important parameter to consider in terminal block designs. While these are very important, there are other factors to consider in your design as detailed below. When designing a system that will utilize a terminal block, you will likely know your overall system voltage and current requirements. Key Terminal Block Electrical Considerations Like PCB mount versions, these can also be single, dual, or multi-level modules. This terminal block type has one input and one output contact where two distinct wires are fed into opposite sides of the housing. Feed-Throughįeed-through terminal blocks are used to connect two wires together for wire-to-wire connections. Barrier strips are commonly used where vibration is a concern. These terminal blocks have a screw down terminal where a ring or spade terminal is attached to the wire and then inserted onto the screw and tightened into the housing. PCB mount terminal blocks can be single, dual, or multi-level modules. The housing is then soldered to a PCB in common footprints. Often referred to as Eurostyle or wire-to-board terminal blocks, PCB mount terminal blocks work by inserting bare wires into the module where a clamp secures the wire in the housing. These are some of the most common: PCB Mount There are various types of terminal blocks that can be used in a design. They are ideal for designs requiring secure, well-organized, and semi-permanent wire connections that can be easily swapped out for inspection or repair in the field. Terminal blocks-also referred to as terminal connectors, connection terminals, or screw terminals-are used in a wide array of applications where electrical systems need to be safely connected. A terminal block consists of a modular housing with an insulated body that secures two or more wires together.
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