A PCB mount screw terminal block connector is a type of electrical connector designed to mount directly onto a printed circuit board (PCB) and provide a secure, detachable connection for wires using screws. These connectors are commonly used in industrial electronics, control panels, power supplies, and other equipment that requires field wiring or regular maintenance.

Key Features of PCB Mount Screw Terminal Block Connectors:

1. Mounting Style:
   
   
   
   • Through-hole mounting: Pins of the terminal block are inserted into holes on the PCB and soldered for secure attachment.
   
   
   • Surface mount technology (SMT): Some terminal blocks are also available in surface-mount versions, but these are less common for high-current connections.
   
   
   
   


2. Connection Type:
   
   
   
   • Screw connection: Wires are clamped into the terminal block by tightening screws, providing a strong mechanical and electrical connection.
   
   
   • Push-in or spring-loaded options: Some variants combine screw or spring mechanisms for easier tool-free connection.
   
   
   
   


3. Pin Configuration:
   
   
   
   • These connectors typically have 2 to 24 poles (or more) depending on the application.
   
   
   • They can come in single row or double row configurations for higher density connections.
   
   
   
   


4. Pitch:
   
   
   
   • The pitch (distance between terminals) can vary, with common sizes including 3.5mm, 5.0mm, 7.62mm, etc., depending on the voltage and current rating.
   
   
   
   


5. Current and Voltage Rating:
   
   
   
   • Typical current ratings range from 5A to 30A, and voltage ratings can range from 150V to 600V, depending on the design and size.
   
   
   
   


6. Wire Size:
   
   
   
   • Can accommodate wire sizes from small gauge (22 AWG) to larger wires (10 AWG or higher), depending on the connector size.
   
   
   
   


7. Materials:
   
   
   
   • Housing: Typically made of flame-retardant materials such as polyamide (PA66).
   
   
   • Terminals: Made of copper or brass with tin plating for enhanced conductivity and corrosion resistance.
   
   
   • Screws: Often steel or brass with protective coatings.
   
   
   
   

Applications:

• Industrial control systems: Wiring field devices like sensors and actuators.


• Power supplies: Connecting input and output power lines.


• Signal connections: Wiring communication or data lines on PCBs.


• Automation equipment: Used in control boards and PLCs.

Common Variants:

• Pluggable terminal blocks: These allow the wiring to be disconnected easily by unplugging the terminal block from its PCB-mounted counterpart.


• Barrier terminal blocks: Provides additional insulation between terminals for higher voltage or current applications.

Advantages:

• Ease of connection: No need for soldering the wires, as the screw mechanism allows easy field termination.


• Reusability: Wires can be connected and disconnected multiple times without degrading the contact point.


• Versatility: Can be used for both signal and power connections.https://store.unigulfsupply.com/product/pcb-mount-screw-terminal-block-connector/