Terminal block is used to fasten or terminate wires. It is often used to connect wiring to a ground or electrical switches and outlets to the mains supply. A terminal block is a screw-type electrical connector where the wires are clamped down to the metal part by a screw. It is a connector which allows more than one circuit to connect to another circuit. It often contains two long aluminum or copper strips that are designed to connect different components.
These strips create a bus bar for power distribution that is sent to the connected components. A barrier strip is composed of several screw terminals. The wire may be wrapped directly under the head of a screw, may be held by a metal plate forced against the wire by a screw, or may be held by what is, in effect, a set screw in the side of a metal tube. The wire may be directly stripped of insulation and inserted under the head of a screw or into the terminal.
Otherwise, it may be either inserted first into a ferrule, which is then inserted into the terminal, or else attached to a connecting lug. which is then fixed under the screw head. Screw terminals are low in cost when compared to other types of connectors, and can be readily designed into products for circuits carrying currents of from a fraction of an ampere up to several hundred amperes at low to moderate frequencies. The terminals easily can be re-used in the field, allowing for the replacement of wires or equipment, generally with standard hand tools. Screw terminals usually avoid the requirement for a specialized mating connector to be applied to the ends of wires.
The 5 Pin Barrier Terminal connector is a top notch PCB Mount screw terminal designed with a 9.5 mm pitch and a remarkable rating of 25 amperes at 300 volts. The HB9500 connector is an ideal choice for applications demanding high current and exceptional product quality, specifically for board-to-wire connections. This connector is suitable for a wide range of PCB terminal wire-to-board connections.
Specification:
- Number of Pins : 5
- Pitch : 9.5 mm
- Material : Metal and plastic
- Rated Voltage : 300 Volts
- Rated current : 25 Ampere
- Wire Range : 22-16 AWG
- insulation resistance : 500M ohm/500 volt
Applications:
There are many applications that use terminal blocks & barrier strips. Screw-type terminals are often used in order to connect a chassis ground, like on a surge protector. Several public address systems use them for speakers and other inputs and outputs. Screw terminals are very widely used in electricity wiring, to connect switches, and for connecting major appliances to plugs at home.
Printed circuit board (PCB) terminal blocks are specially designed with a copper alloy pin of suitable size and length and can be inserted in printed circuit boards to be soldered to allow electrical signals and current to flow to and from PCBs and electrical equipment. Some designs provide features that allow the flow of molten solder to endure a better connection between the circuit traces of the board and the electrical equipment which is meant to be controlled or fed appropriate power.
Installation:
Assembly of a screw connection requires some care in workmanship to ensure proper removal of insulation, containment of all wire strands, and the adequate tightening of the screw. If the wire diameter is small in relation to the size of the screw, the wire may be cut through by the over-tightening of the screw. This is less likely to occur when a wire is clamped between two plates by the action of a screw. Since wire strands may not be contained by the screw head in a basic screw terminal, stranded wires may be crimped into a ferrule to prevent the bridging of terminals; this partly offsets the economy of a "bare" wire termination.
While wires may be crimped, they should not be heavily tinned with solder prior to installation in a screw terminal, since the soft metal will cold flow, resulting in a loose connection and possible fire hazard. Screw connectors sometimes come loose if not done up tightly enough at fitting time. Verifying adequate tightening torque requires calibrated installation tools and proper training.
