Several Wiring Methods of screw, push button Terminal Blocks

Termination method refers to the connection method between the contact pair of the terminal block and the wire or cable. Reasonable selection of termination methods and correct use of termination technology is also an important aspect of using and selecting terminal blocks.
Welding of terminal blocks
The most common form of welding is soldering. The most important thing for a soldering connection is that there should be metallic continuity between the solder material and the surface being soldered. Therefore, what is important for terminal blocks is solderability. The most common platings on the solder ends of terminal blocks are tin alloy, silver and gold. Common soldering ends of reed contacts include welding lug type, punched welding lug type and notch welding lug type. Pinhole contacts have drilled arc notches for common welding ends.

Different wiring methods of terminal blocks

Crimping of terminal blocks
Crimping is a technique for compressing and displacing metal within specified limits and connecting conductors to contact pairs. A good crimp connection creates a metal-to-metal flow that causes the wire and contact material to deform symmetrically. This type of connection is similar to a cold welding connection and can achieve better mechanical strength and electrical continuity, and it can withstand harsher environmental conditions. It is generally believed that correct crimping connections are better than soldering, especially in high current situations where crimping must be used. Special crimping pliers or automatic or semi-automatic crimping machines must be used when crimping. The conductor barrel of the contact pair should be correctly selected according to the cross section of the cold-pressed terminal wire. It is important to note that crimp connections are permanent connections and can only be used once.

Wrapping of terminal blocks
Wrapping involves wrapping the wire directly around an angled contact wrap post. During winding, the wire is wound under controlled tension, pressed into and fixed at the corners of the contact winding post to form an airtight contact. There are several requirements for wrapping wires: the nominal value of the wire diameter should be within the range of 0.25mm~1.0mm. When the wire diameter is not greater than 0.5mm, the elongation of the conductor material is not less than 15%. When the wire diameter is greater than 0.5mm, the elongation of the conductor material shall not be less than 20%. Winding tools include winding guns and fixed winding machines.

Terminal strip for plug-in wiring

Piercing connection of terminal blocks
Puncture connection, also known as insulation displacement connection, is a novel end technology invented by the United States in the 1960s. It has the characteristics of high reliability, low cost and easy use, and has been widely used in various printed board terminal blocks. It is suitable for ribbon cable connections. There is no need to strip off the insulation layer of the cable when connecting. The tip of the “U” shaped contact spring of the terminal block is penetrated into the insulation layer. The conductors of the cable slide into the slots of the contact reed and are clamped, thereby forming a tight electrical connection between the cable conductor and the terminal reed. It requires only simple tools, but must use cables with specified wire gauges.

Screw connections for terminal blocks
Screw connection is a connection method using screw terminals. Pay attention to the maximum and minimum cross-sections allowed for connecting wires and the maximum tightening torque allowed for screws of different specifications.