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About PCB Terminal Blocks
PCB terminal blocks are modular, insulated devices that mount on printed circuit boards (PCBs) and secure two or more wires together. Some have integral pin terminals and mount through holes in the board. Others plug into PCB-mounted pin strips. Screw clamps, spring clamps, insulation displacement, and tab terminals are used to make electrical connections. Pluggable and stackable units are also available. Most PCB terminal blocks are mounted horizontally, vertically, or at a 45° angle. Voltage rating, current rating, and operating temperature are important performance specifications. Additional considerations include number of contacts or pins, contact pitch and conductor size. American wire gauge (AWG), a U.S. standard for non-ferrous wire conductor sizes, is used to indicate wire diameter. The higher the gauge number, the smaller the diameter and the thinner the wire. In North America, organizations such as Underwriters Laboratories (UL) and the Canadian Standards Association (CSA) provide approvals and certifications. PCB terminal blocks that bear the CE Mark and the VDE Mark are also available.
There are many types of PCB terminal blocks. Single feed-through devices have one input contact and one output contact. They are used in wire-to-wire connections where a wire is fed through one side and out the other. Dual level or two-tier devices have two levels of contacts in order to save space and simplify wiring. Three level or three-tier devices are also available. Bridged PCB terminal blocks connect multiple levels and increase circuit flexibility. Ground circuit terminals are interchangeable with standard blocks and permit the grounding of equipment. Disconnect or switch blocks can be disconnected without removing wires. They usually include a knife switch, sliding link, or removable plug. Fuse blocks or fuse holders are circuit protection devices that contain short circuits and provide visual indications of fuse condition. Thermocouple blocks connect temperature-sensing thermocouples and use reliable metal connections. Input/output (I/O) blocks provide communication between controllers and sensors. Actuator blocks are used with three-wire and four-wire devices such as proximity sensors and photoelectric sensors. Transformer terminal blocks mount on coiled bodies and adapt coil ends to screw or push-on tab connections for power connections. Electronic circuit blocks provide functionality such as rectification and voltage indication. Power distribution blocks are designed specifically for the power distribution industry.
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Part Numbers for PCB Terminal Blocks
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| 1652130000 | Digi-Key | Weidmuller | Connectors, Interconnects | CONN PCB BLZ 5.08 ZE 4POS BK |
| 1760080000 | Digi-Key | Weidmuller | Connectors, Interconnects | CONN PCB SNAP-ON FEET TS-15 |
| 1606450000 | Digi-Key | Weidmuller | Connectors, Interconnects | CONN PCB BB 15R OR |
| 1705290000 | Digi-Key | Weidmuller | Connectors, Interconnects | CONN PCB BLZ AH 11POS BK |
| 1705300000 | Digi-Key | Weidmuller | Connectors, Interconnects | CONN PCB BLZ AH 12POS BK |
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