Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
31049108 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	589
31169103 RIA Connect / METZ CONNECT	SCREW TYPE, TERMINAL BLOCK, VERT	1667
31007106 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	420
31017102 RIA Connect / METZ CONNECT	PIN HEADER, VERTICAL, THR, PCB,	5261
31166102 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	4008
31188102 RIA Connect / METZ CONNECT	SHROUDED HEADER, RIGHT ANGLE, PC	477
31349103 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	1043
31007110 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	74
31017112 RIA Connect / METZ CONNECT	PIN HEADER, VERTICAL, THR, PCB,	1746
31107106 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	2009
31249108 RIA Connect / METZ CONNECT	SCREW TYPE TERMINAL BLOCK, PLUG,	372
31017110 RIA Connect / METZ CONNECT	PIN HEADER, VERTICAL, THR, PCB,	171
31191108 RIA Connect / METZ CONNECT	SHROUDED HEADER, VERTICAL, THR,	195
31230104 RIA Connect / METZ CONNECT	PIN HEADER, RIGHT ANGLE, SHROUDE	2137
31030104 RIA Connect / METZ CONNECT	SHROUDED HEADER, RIGHT ANGLE, PC	210
31224102 RIA Connect / METZ CONNECT	PIN HEADER, VERTICAL, THR, PCB,	324
31191102 RIA Connect / METZ CONNECT	SHROUDED HEADER, VERTICAL, THR,	780
31189105 RIA Connect / METZ CONNECT	SHROUDED HEADER, VERTICAL, PCB,	2005
ASP0450422 RIA Connect / METZ CONNECT	SPRING CLAMP TERMINAL BLOCK, PLU	0
31020104 RIA Connect / METZ CONNECT	SHROUDED HEADER, VERTICAL, PCB,	440

Terminal Blocks - Headers, Plugs and Sockets

1. Overview

Terminal blocks, headers, plugs, and sockets are essential components in electrical and electronic systems for establishing reliable connections between circuits. These devices enable signal transmission, power distribution, and system modularity. Their standardized designs ensure interoperability, scalability, and ease of maintenance in complex systems.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Terminal Blocks	Screw/clamp-based connections for high current/ voltage	Industrial control panels, power distribution units
PCB Headers	Pin/grid arrays for board-to-board connections	Embedded systems, Arduino shields
RJ Connectors	Modular jacks for data/telecom signals	Ethernet networks (RJ45), telephone systems (RJ11)
D-Sub Connectors	Multi-pin trapezoidal shells for analog/digital signals	Legacy serial interfaces, industrial sensors
USB Connectors	Hot-pluggable interfaces for power/data	Consumer electronics, peripheral devices

3. Structure and Components

Typical structures include:

Insulating housing (PA66, PBT, or LCP plastics)
Contact elements (phosphor bronze, beryllium copper)
Plating materials (gold, tin, nickel for corrosion resistance)
Actuation mechanisms (screws, spring clamps, or friction fits)
EMI shielding layers (for high-frequency applications)

4. Key Technical Specifications

Parameter	Importance
Current Rating (A)	Determines power handling capacity
Voltage Rating (V)	Defines dielectric strength requirements
Contact Resistance (m )	Impacts signal integrity and power loss
Insertion Loss (dB)	Critical for high-speed data transmission
Mating Cycles	Indicates mechanical durability
Operating Temperature (- C to + C)	Defines environmental tolerance

5. Application Fields

Primary industries include:

Industrial automation (PLCs, HMIs)
Telecommunications (5G base stations, routers)
Consumer electronics (smartphones, wearables)
Medical equipment (imaging devices, patient monitors)
Automotive (EV charging systems, ADAS)

6. Leading Manufacturers and Products

Manufacturer	Representative Product
Phoenix Contact	COMBICON series terminal blocks
TE Connectivity	MICRO MATCH connectors
Molex	SL Series headers
Amphenol	D-Subminiature connectors
Samtec	QTE high-speed socket systems

7. Selection Guidelines

Key considerations:

Electrical requirements (current/voltage levels)
Mechanical constraints (space, vibration)
Environmental factors (temperature, humidity)
Signal integrity needs (frequency, noise rejection)
Cost vs. reliability trade-offs
Compliance with standards (IPC, IEC, UL)

8. Industry Trends

Emerging developments include:

Miniaturization for wearable devices
High-speed connectors for 5G/6G ( 25 Gbps)
Hybrid connectors integrating power/data
Eco-friendly materials (halogen-free, RoHS compliant)
Smart connectors with built-in sensors
Automotive-grade connectors for EVs