Terminals - Screw Connectors

Part Number	Description / PDF	Quantity
7761-7 Keystone Electronics Corp.	TERM SCREW M3 4 PIN PCB RA	10900
7461096 Würth Elektronik Midcom	TERM REDCUBE M4 9PIN PCB	1906
7697-3 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	24600
7692 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB RA	6678
7795 Keystone Electronics Corp.	TERM SCREW M4 4 PIN PCB	6809700
7690-6 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB RA	26700
7460553 Würth Elektronik Midcom	TERM REDCUBE M8 10PIN PCB	398
5055558-7 TE Connectivity AMP Connectors	TERM SCREW 6-32 10 PIN PCB	5
S93520 Würth Elektronik Midcom	POWERPLUS HIGH CURRENT TERMINAL	35
7466004 Würth Elektronik Midcom	TERM REDCUBE M4 1PIN SMD	559
1248 Keystone Electronics Corp.	TERM SCREW 6-32 2 PIN PCB	431
7460307 Würth Elektronik Midcom	TERM REDCUBE M4 8PIN PCB	3507
7466114 Würth Elektronik Midcom	TERM REDCUBE M4 1PIN SMD	0
7761-3 Keystone Electronics Corp.	TERM SCREW M3 4 PIN PCB RA	0
7787 Keystone Electronics Corp.	TERM SCREW 10-32 6 PIN PCB	698255800
5055323-5 TE Connectivity AMP Connectors	TERM SCREW 6-32 6 PIN PCB	1824
7697-SEMS Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	29900
7775-SEMS Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	0
7466104R Würth Elektronik Midcom	TERM REDCUBE M4 1PIN SMD	1373
S93512 Würth Elektronik Midcom	POWERPLUS HIGH CURRENT TERMINAL	591

Terminals - Screw Connectors

1. Overview

Screw connectors are electrical terminals that use screws to clamp and secure conductors, enabling reliable electrical connections. As fundamental components in circuit systems, they ensure stable signal and power transmission. Their importance in modern technology spans industries requiring secure, maintainable connections, including industrial automation, energy systems, and consumer electronics.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
PCB Terminal Blocks	Direct soldering to printed circuit boards, screw-based wire retention	Control panels, industrial sensors
Panel-Mount Terminals	Chassis or panel installation with screw clamping	Power distribution cabinets, HVAC systems
Cage Clamp Terminals	Spring-loaded cage mechanism for quick wire insertion	High-vibration environments like rail transport
DIN Rail Connectors	Standardized mounting on DIN rails for modular systems	Factory automation control cabinets

3. Structure and Components

Typical screw connectors consist of: - Conductive Elements: Brass or phosphor bronze contacts with gold/silver plating for low resistance - Insulation Housing: Thermoplastic materials (e.g., PA66, PBT) with UL94 V-0 flammability rating - Screw System: Stainless steel or nickel-plated screws with torque-limiting design - Wire Stop: Mechanical barrier ensuring proper conductor alignment

4. Key Technical Specifications

Parameter	Importance
Rated Current (10-300A)	Determines power transmission capacity
Rated Voltage (50-1000V)	Defines insulation and safety limits
Contact Resistance (<10m )	Impacts connection efficiency and heating
Insulation Resistance (>100M )	Ensures electrical isolation integrity
Withstand Voltage (2500V/1min)	Safety compliance under overvoltage conditions
Operating Temperature (-60 C to +150 C)	Material stability in extreme environments

5. Application Fields

Industrial Automation: PLC systems, motor drives
Renewable Energy: Solar inverters, wind turbine controls
Transportation: EV charging stations, rail vehicle wiring
Building Systems: HVAC controls, security panels
Test Equipment: Oscilloscope probes, power analyzers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Phoenix Contact	PT 3.5	Modular design, vibration-resistant
Weidm ller	SAM series	Space-saving, 130mm capacity
TE Connectivity	MicroSpeed	High-density PCB terminals
WAGO	280 Series	Cage-clamp technology, tool-free

7. Selection Guidelines

Key considerations:

Electrical requirements (current, voltage, frequency)
Environmental conditions (temperature, humidity, vibration)
Wire size compatibility (AWG/mm specifications)
Certifications (UL, CE, RoHS compliance)
Maintenance accessibility (screw torque requirements)
Cost vs. longevity trade-offs

8. Industry Trends

Emerging developments include: miniaturization for IoT devices, smart connectors with integrated sensors, graphene-enhanced contacts for higher conductivity, and automated screwdriver systems for mass production. Environmental regulations are driving halogen-free insulation materials, while Industry 4.0 demands connectors with embedded diagnostics capabilities.