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What is Terminal Block? 

 

When you have a set of electrical wires to connect, a terminal block provides a safe, convenient way to keep them organized. They are rugged, easy to use and designed to keep wires of varying gauges securely connected.

Function

A terminal block is a set of two or more similar screw-down connection points. You can connect wires at these points. A terminal strip combines many similar blocks in a single device. In a strip, the blocks are insulated from one another.

Materials

A terminal block's main functions are to connect and to insulate. The main block body is made of a tough material, such as plastic or ceramic, that electrically isolates adjacent blocks. The conducting parts are made of copper and corrosion-resistant metals compatible with copper.

Use

A terminal block must first be mounted in a safe, stable location away from moisture. To use it, strip about ½ inch of insulation from the two wires you want to connect. You then insert the bare wires into the block's metal connectors and screw them down until they're securely fastened.

Special Functions

While most terminal blocks simply create an electrical connection, some have built-in fuse holders, indicator lamps or other features that add functionality for more sophisticated applications.

Variety

You can find dozens of types of terminal blocks, some generic, some specialized. Designers have developed terminal blocks for household, industrial, electronic and many other uses.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Labeling

You can use a terminal block to organize wires having different functions. Many terminal blocks have a labeling scheme that lets you identify how the wires are organized.

Orientation

Terminal blocks are commonly available with one of three different wire entry angles: 45°, 90°, or 180°. 90° and 180° types are also referred to as horizontal and vertical, respectively.

Contact and Wire Specifications

When discussing terminal blocks, the term "contact", also known as a position, way, or pole, refers to a wire attached to the block. The number of contacts is an important specification when considering a product, as a buyer is required to match this number with the number of wires necessary for a project or application. Contact pitch refers to the distance between each contact, measuring from the center of each hole or opening. Contact pitch is directly related to the number of contacts and is typically expressed in millimeters (mm).

 

Terminal blocks are typically manufactured to accept a range of wire or conductor sizes. North American wire size is expressed in American wire gauge (AWG), which is a standard for non-ferrous wire conductor sizes. Higher AWG numbers represent smaller conductor diameters, and vice versa. For example, a typical AWG 12 household wire has a larger diameter than a AWG 22 telephone wire.

 
What is Fuse Block?
 
Fuse Blocks are important electrical components intended to protect a vehicle's electrical devices from shorts or power surges. The fuse blocks contain fuses rated at different amperage values depending upon the electrical device that it is protecting. Upon a sudden voltage spike or short, the fuse will burn out, protecting the affected device. 
 

Changing a fuse is a straight-forward operation. Once the appropriate blown fuse has been located, it is pulled from its mounting location within the fuse block. A new fuse is simply inserted into the vacated location in the fuse block. It is imperative that the same amperage rated fuse is used when changing any blown fuse.

 

Electrical fuse blocks use fuses rated from 15 to 100 amps. This rating coincides with a particular electrical component's ability to withstand damage. The fuse blocks are designed to allow the fuse to blow or burn out before the component can be damaged. Replacing any blown fuse with a fuse of a higher amperage rating could cause irreparable damage to the electrical component.

What is Solid State Relay?
 
  SSR is new type of excellent performance non-contact electronic switch device which using advanced foreign technology and equipment.  
 
 
 
The input end only requires a small control current, and better compatibility with TTL, HTL, CMOS integrated circuit.  And the output circuit adopts thyristor or high power transistor to connect and disconnect the load current.  The input and output connecting with photocoupling, on –off without contact member, therefore it has lot of superiority, such as reliable, ast, no noise, long life, small volume, no spark, corrosion proof and anti vibration etc.
 
At present, SSR has been widely used in computer peripheral equipment, electric heating thermostat, CNC machine, remote control system, industrial automation equipment, signal lamps, relay family(EMR).
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