![]() While each specific block type may be used in a different context, all terminal blocks provide the same function of connecting electrical components in a safe and reliable manner for complex electrical system connections. Additionally, using different housing colors and/or marking tags on each terminal block will aid in the identification of a specific circuit. Terminal blocks provide an organized, clean, and professional-looking control panel. Exposed or unsecured electrical wires are unsafe for the system and user. Many control panels can often appear disorganized and complex making it difficult to troubleshoot and maintain. With a large number of wires these terminal blocks provide a well-organized control panel. Power Distribution Blocks – It is a convenient, economical, and space-saving way to distribute power from a single input source to multiple outputs. Whereas sensor blocks handle 3 or 4 wire devices such as proximity sensors. I/O Blocks and Sensor Blocks – I/O blocks are used to make a connection between a device and a controller. Meaning it is not necessary to remove wires. Allows wires to be easily disconnected just by lifting a lever or switch. Ideal for use with actuators and sensors due to the number of wires they require.ĭisconnect Terminal Blocks – AKA switch blocks. One can create levels or tiers of termination points to provide space-saving, greater functionality, and future system expansion. Multi-Level Terminal Blocks – Allow for several terminations in one block. This is ideal for PLC applications providing protection against over current and short circuit conditions. This product can also include an LED to alert you of a malfunction. Ground Terminal Blocks – These blocks look like single-level feed terminals, however, the metal connection where the wire is terminated is grounded to the electrical panel or DIN rail.įused Connection Terminal Blocks – The metal connection strip is replaced with a fuse. Variations of these include single, dual, and multi-level modules. This type has one input and one output contact. IDC (insulation displacement connector)įeed-thru Terminal Blocks – Are used to connect 2 wires together for a wire-to-wire connection.Terminal Blocks typically have several different wire connection technologies that secure the wire to the terminal. These include horizontal, vertical, and 45-degree angled. Therefore, terminal blocks have varied wiring entry options. Control Cabinet Environment – Depending on the chosen size of the control cabinet, configuration, and the number of additional components, working space can be an issue.Pole Count – The number of individual circuits within the terminal block is also known as pole count.Current Requirements – It is best practice to use terminal blocks that are rated at least 150% of the maximum current in the system. ![]() ![]() Voltage Rating – The maximum system voltage of the application must be less than the voltage rating.Stranded or multi-core wire is used for screw terminals and single-core is typically used for push-in-style terminal blocks. Wire Gauge (Wire Size) – The minimum and maximum wire size (AWG/mm2) will be a function of the voltage/ current rating.Since terminal blocks are important for the electrical performance and prevention of safety hazards, when choosing the most suitable terminal block one must consider the wire gauge, overall system voltage, current requirements, pole count, and cabinet environment. They provide a semi-permanent wire connection that can easily be removed, modified, and replaced for inspection or repair. Terminal blocks are used wherever electrical systems need to stay safely connected, organized, and secure. The insulating body of a terminal block consists of a current-carrying element, a clamping element, and a mounting arrangement. A terminal block is a modular housing with an insulated body that secures two or more wires together.
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