Terminals - Screw Connectors

Part Number	Description / PDF	Quantity
8730 Keystone Electronics Corp.	TERM BINDING POST M2.5 1 PIN PCB	145566800
7691-6 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	26900
8197 Keystone Electronics Corp.	TERM SCREW 6-32 6 PIN PCB	2147483647
7695 Keystone Electronics Corp.	TERM SCREW M3 4 PIN PCB RA	10184400
7775-6 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	9700
7692-2 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB RA	900
8195-5 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	7200
7761-6 Keystone Electronics Corp.	TERM SCREW M3 4 PIN PCB RA	200
214786 ERNI Electronics	POWERTAP M4 SOLDER 10	4534
74650094R Würth Elektronik Midcom	TERM REDCUBE M4 8PIN PCB	3914
7701-7 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	0
74651174R Würth Elektronik Midcom	TERM REDCUBE 4PIN PCB	932
74650173R Würth Elektronik Midcom	TERM REDCUBE M3 4PIN PCB	1619
1273 Keystone Electronics Corp.	TERM SCREW 6-32 2 PIN PCB	11523900
7761-4 Keystone Electronics Corp.	TERM SCREW M3 4 PIN PCB RA	200
8189-6 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB	18900
7692-7 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB RA	0
7692-4 Keystone Electronics Corp.	TERM SCREW 6-32 4 PIN PCB RA	0
7758-2 Keystone Electronics Corp.	60-SCREW CAPTIVATED TERMINAL W/	1500200
7689-7 Keystone Electronics Corp.	TERM SCREW M3 4 PIN PCB RA	0

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.