90° and 180° types are also referred to as horizontal and vertical, respectively. Terminal blocks are commonly available with one of three different wire entry angles: 45°, 90°, or 180°. They are also known as spade or blade terminals.Ī group of screw clamp terminal blocks (left) and a spring clamp product (right). Tab connections are designed to be inserted and removed rapidly without the need for soldering. Terminal blocks may also be grouped by application or type of device they connect.
![phenolic trminal pins phenolic trminal pins](https://www.pimfg.com/products-large/HW-HD-30-A-4PH-1.jpg)
Like dual level terminal blocks, they can also be bridged.Ī three level terminal block. Three level terminal blocks are essentially dual level products with an extra stacked level of contacts. Multi-level products may use a bridge to connect one contact level to another for increased circuit flexibility.Īn example of a dual level, 4-contact terminal block. Image credit: OMEGA Engineering, Inc.ĭual level terminal blocks have two levels of contacts this arrangement saves space and simplifies wiring. Single feed terminal blocks have one input and one output contact: two distinct wires are fed into either side of the terminal block and are connected within its housing.Ī single feed terminal block. Single feed products represent the basic type of terminal block, and are used for wire-to-wire connection. Terminal blocks can be classified according to their structure as well as device type. This not only prevents loosening because of differing expansion rates but also reduces corrosion caused by electrolytic action between two different metals.
![phenolic trminal pins phenolic trminal pins](https://www.pimfg.com/products-large/HW-HD-30-A-2PH-2.jpg)
Terminal bodies typically consist of a copper alloy with the same expansion coefficient as the wire intended for use.
![phenolic trminal pins phenolic trminal pins](https://qcpinc.net/wp-content/uploads/2018/07/G10-PHENOLIC.jpg)
Terminals are useful for connecting wiring to a ground or, in the case of electrical power, for connecting electrical switches and outlets to the mains. Terminal blocks are used to secure and/or terminate wires and, in their simplest form, consist of several individual terminals arranged in a long strip. Terminal blocks are modular, insulated blocks that secure two or more wires together.