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TERMINAL BLOCKS
RISING CLAMP TERMINAL BLOCKS
Rising clamp PCB terminal blocks give excellent repeatable clamping performance. They can accept a wide range of wire sizes both solid and stranded and with or without ferrules. They have a much wider range of wire size acceptance than wire protector types.
Options:
- Pitch sizes 3.5mm to 10mm
- Standard or wire protectors
- Current Rating (A) 6 to 52
- Poles range 2 to 33
- Orientation: Horizontal, Vertical, 45o
- Colours: Green and Grey
WIRE PROTECTOR TERMINAL BLOCKS
Standard PCB terminal blocks are your typical wire to board connection method, soldered to the board at one end by the pins and the wire entry on a separate face horizontal or vertical to the PCB. The terminal block offers a screw type termination method, which in this section is a wire protector terminals.
Options:
- Pitch sizes 3.5mm to 10mm
- Standard or wire protectors
- Current Rating (A) 10 to 16
- Poles range 2 to 12
- Orientation: Horizontal or Vertical
- Colours: Green and Grey
PLUGGABLE CLAMP TERMINAL BLOCKS
Pluggable terminal blocks open up more opportunities for terminal blocks to become a more working and flexible connector. One half of the plug, the receptacle, is soldered to the PCB as you would with a standard PCB terminal block. This then creates a header for the plug side of the connector to be connected to.
Options:
- Pitch sizes from 2.5mm to 7.62mm
- Current Rating (A) 4 to 20
- Poles range 2 to 24
- Flanges and Lugs options
- Colours: Green and Black
DIN RAIL TERMINAL BLOCKS
DIN Rail terminal blocks provide users with a handy and useful way of connecting wires together on a DIN rail system, by using a pluggable method. The terminal block that is mounted to the DIN rail features wire terminals in which the service engineer can connect wires using the rising clamp terminals, on the other end is a header styled connector.
Options:
- Pitch sizes from 5mm to 5.08mm
- Current Rating (A) 15
- Poles range 6 to 10
- Flanges and Lugs options
- Orientation: Horizontal or Vertical
- Colours: Green
SCREWLESS TERMINAL BLOCKS
Screwless PCB terminal blocks provide a designer with a versatile wire to board connection method. Wires are connected to the terminal block by using a push actuator, a cage clamp then opens up once the actuator has been pushed, and the wire can then be inserted, once the actuator has been let go the cage clamp terminal holds the wire in place.
Options:
- Pitch sizes from 2.5mm to 7.62mm
- Current Rating (A) 15
- Poles range 2 to 10
- Flanges and Lugs options
- Orientation: Horizontal or Vertical
- Colours: Green or Grey
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FAQ
Terminal blocks are electrical connectors used to join multiple wires or cables together. They typically consist of a strip of metal with screws or clamps that secure the wires in place.
The basic operation of a terminal block involves inserting the bare ends of wires into the openings on the block, then tightening the screws or clamps to secure the wires in place. This creates a secure electrical connection between the wires, allowing electricity to flow from one wire to another.
Terminal blocks are commonly used in industrial and commercial applications where multiple wires need to be connected or disconnected quickly and easily. They are often used in control panels, power distribution systems, and other electrical equipment.
Selecting the appropriate type of connector for a particular application may seem like a simple task, but in reality, it can be more complicated than expected. Terminal blocks, in particular, have various aspects that need to be considered, such as current requirements, voltage requirements, wire specifications, mechanical strength, and environmental conditions.
Current Requirements
One of the most important factors to consider is the current requirement, as exceeding the rated current capacity of a terminal block can cause overheating and damage to the block. When selecting a terminal block, ensure that it can handle the expected current draw with a 50% safety margin. For instance, if the expected current draw is 2A, a terminal block rated for 3A would be suitable.
Voltage Requirements
Voltage is another essential aspect to consider, as exceeding the voltage rating of a terminal block can cause dielectric breakdown and current leakage between adjacent blocks. Although voltage requirements below 100V are often neglected, it is still crucial to check the voltage rating before selecting a terminal block.
Wire Specifications
Different wire types have their own strengths and weaknesses, so it is important to choose a terminal block that is compatible with the specific wire being used. For example, when selecting a terminal block for a cable, it is essential to consider the cable size and whether it is single-core or multi-core. Multi-core wire is typically suitable for screw terminals, while single-core wire works well with push-fit connectors.
Environmental/Mechanical Strength
The environment in which the terminal block will be used is a vital consideration as it can affect the mechanical strength and reliability of the connection. For example, if the terminal block will be used in a marine environment, salty air can corrode the metal contacts, even if the block is mechanically robust and can handle high currents. Additionally, if the environment has wide temperature swings or mechanical vibrations, screw terminations may be unreliable, and alternative connectors may be needed.
Terminal blocks are typically used when multiple wires need to be connected together in an electrical system. They provide a secure and reliable connection that allows electricity to flow between the wires. Some specific situations where terminal blocks may be used include:
Power distribution: Terminal blocks are commonly used in power distribution systems to connect multiple wires and distribute power throughout the system.
Control panels: In control panels, terminal blocks are used to connect switches, relays, and other components to the control circuitry.
Lighting: Terminal blocks may be used in lighting applications to connect multiple wires to the light fixture.
Motors and generators: Terminal blocks are often used in motors and generators to connect the wires that control the operation of the machine.
Industrial equipment: Terminal blocks are used in a wide variety of industrial equipment, including machinery, robots, and conveyor systems, to connect and control the electrical components of the system.
HVAC systems: In heating, ventilation, and air conditioning (HVAC) systems, terminal blocks are used to connect the various components of the system, such as thermostats, motors, and fans.
In general, terminal blocks are used in any application where multiple wires need to be connected in a secure and reliable manner. They are widely used in industrial, commercial, and residential settings and come in many different types and sizes to meet the specific requirements of different applications.
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