Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
1798550000 Weidmuller	TERM BLOCK PLUG 4POS 3.81MM	0
1122070000 Weidmuller	TERM BLOCK HDR 2POS VERT 7.62MM	348
1982770000 Weidmuller	TERM BLOCK PLUG 9POS 5.08MM	72
1795280000 Weidmuller	TERM BLOCK HDR 22POS VERT 3.5MM	0
1277470000 Weidmuller	TERM BLOCK PLUG 6POS STR 3.5MM	173
1980530000 Weidmuller	TERM BLOCK PLUG 7POS STR 7.62MM	100
1557560000 Weidmuller	TERM BLOCK PLUG 4POS 5.08MM	173180
1043490000 Weidmuller	TERM BLOCK PLUG 4POS STR 7.62MM	100
1969190000 Weidmuller	TERM BLOCK PLUG 12POS STR 3.81MM	50
1241660000 Weidmuller	TERM BLOCK HDR 8POS 90DEG 5.08MM	0
2648640000 Weidmuller	TERM BLK HDR 3POS 180DEG 5.08MM	288300
1353240000 Weidmuller	PCB PLUG-IN CONNECTOR, FEMALE PL	54
1552710000 Weidmuller	TERM BLOCK PLUG 2POS 5.08MM	0
1943820000 Weidmuller	TERM BLOCK PLUG 3POS STR 5.08MM	1299300
1134110000 Weidmuller	TERM BLOCK HDR 4POS VERT 7.62MM	126
1862460000 Weidmuller	TERM BLOCK HDR 2POS 90DEG 3.81MM	468350
1526510000 Weidmuller	TERM BLOCK PLUG 3POS STR 5.08MM	238
1726780000 Weidmuller	TERM BLOCK HDR 12POS VERT 5.08MM	63
1000890000 Weidmuller	TERM BLOCK PLUG 5POS STR 5.08MM	100
2649640000 Weidmuller	TERM BLK HDR 6POS 180DEG 5.08MM	200200

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