5443221 Connectors, Interconnects

Voltage - UL:	300V
Insulation Height:	0.933" (23.70mm)
Contact Tail Length:	0.126" (3.20mm)
Housing Material:	Polyamide (PA), Nylon
Contact Material:	--
Wire Strip Length:	--
Torque - Screw:	--
Screw Size:	--
Ingress Protection:	--
Material Flammability Rating:	UL94 V-0
Features:	--
Contact Mating Finish:	Tin
Operating Temperature:	--
Color:	Green
Wire Gauge or Range - mm²:	--
Wire Gauge or Range - AWG:	--
Series:	BCDH
Current - UL:	12A
Voltage - IEC:	400V
Current - IEC:	10A
Mounting Type:	Through Hole
Termination Style:	Solder
Plug Wire Entry:	--
Header Orientation:	90°, Right Angle
Pitch:	0.197" (5.00mm)
Number of Levels:	2
Positions Per Level:	4
Number of Positions:	8
Type:	Header, Male Pins, Shrouded (4 Side)
Part Status:	Active
Packaging:	Bulk

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Terminal blocks (also known as terminal boards, header strips or plug strips) are devices used to electrically connect components on a circuit board. They are also referred to as screw-type or barrier-type devices. Tape onto the back of terminal blocks (using hot melt) is the most popular way to mount them to a circuit board.Terminal blocks are designed to securely hold multiple wires in place, while still allowing individual wires to be disconnected, if needed. They are also ideal for connecting power sources to boards, as the wires are tightly held. In this way, connections can be made without soldering, which can be time consuming and difficult.Terminal blocks are available in many styles, shapes and sizes. They can be used with a variety of electrical components such as transistors, ICs, capacitors, diodes, and resistors.The most common types of terminal blocks are headers, plugs, and sockets.Header terminal blocks are generally used for direct wiring and have screw or screwless connections. These blocks are designed to easily accept any number and type of wires or cables. Typically the contacts are made of brass and the block insulation is made of plastic or ceramic.Plug terminal blocks, also called "plug and play" terminal blocks, are designed for easy connecting and disconnecting of wires. Plug and play terminal blocks use more complicated contacts and insulation, so they are typically more expensive than header blocks.Socket terminal blocks are similar to plug terminal blocks, except that they are designed for permanently installed wires. Socket terminal blocks feature a socket into which a plug or header terminal block can be inserted. This design makes it easy to replace broken or malfunctioning terminals.In addition, screwless or spring clamp terminal blocks are used for applications where easy wiring is necessary. These blocks are used for higher current loads, as the clamps create a strong connection that is more reliable than screws.Each type of terminal block has different applications, depending on the specific needs of the circuit board or system. Header blocks are generally used for applications that require the secure connections of multiple wires to one device, such as a circuit board. Plug blocks are usually used in applications where multiple sources need to be connected to the board, such as for power input into the board. Socket blocks can be used for applications that require the use of plugs, headers or screw-in connectors. Spring clamp blocks are used for applications that require high current loads, such as in the motor and large power distribution applications.The working principle of terminal blocks is relatively simple. In the case of the header terminal blocks, they have insulation with holes through which screw terminals are connected. The contact is made between the two points, with a wire that connects the two contacts together. For plug terminal blocks, the insulation also contains holes for the receiving ends of the plugs, whereas on socket terminal blocks, the insulation contains a socket for the receiving end of the plug. In all types of terminals, the contact is made when the plug or header is inserted into the terminal block and secured with a screw.Overall, terminal blocks are essential components in various types of electrical systems. With their secure connection, low cost, and easy installation, terminal blocks are found in many types of electrical equipment. Whether it’s a header, plug, or socket terminal block, the user can be assured of a reliable and efficient connection.

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