Interconnection
Figure 2: The terminal block’s pitch, one of the selection criteria for circuit designers, is the distance between the centre of one pole and the next. (Image Source: WAGO)
can accommodate. The terminal block’s voltage/current allowance, creepage, etc., determine the block’s pitch, which is the distance between the centre of one pole and the next (Figure 2). Finally, designers have to ensure that the housing for the terminal block will accommodate the wires, a size usually specifi ed in American Wire Gauge (AWG). Electrical performance must be factored in with mechanical
block for connecting wires will likely focus on units that can perform under extreme environmental conditions and be packed into smaller form factors.
The criteria to consider before choosing a terminal block include the current and voltage the circuits must endure. Designers typically allow some leeway in the numbers (150 per cent of the needed rating) before selecting a product. Pole count determines the number of circuits the terminal block
parameters and other metrics before picking a terminal block. For example, WAGO’s 2601 Series PCB terminal blocks with levers are compact and tool-free, allowing quick and easy termination for 26 AWG to 14 AWG wire. Relying on WAGO’s patented Push-In CAGE CLAMP connection technology, solid and fi ne-stranded conductors with ferrules are connected by pushing them into the block. With the ability to be connected vertically or horizontally to the PCB and with a pin spacing
Figure 3: WAGO's PCB terminal blocks with push-in CAGE CLAMP connection technology are ideal for connecting compact devices in space-restricted or panel feedthrough/through-panel mounting applications.
of just 3.5 mm, the 2601 series takes up minimal board space. The 2601 series makes WAGO’s selection of lever-equipped PCB terminal blocks ideal for device connections in the fi eld, no matter the performance class. The tool-free wiring is intuitive for worldwide use, and the lever technology ensures that the contact point is always secure. The series fi nds applications in power supplies, control boards, device manufacturing/device connections, interface modules, sensors, smart homes, and control boards.
Conclusion
Terminal blocks are crucial for establishing the integrity and performance of complex electrical and electronic circuits. When selecting one, design engineers must consider various factors, including the application, voltage and current tolerances, and mechanical connection mechanisms. Push-in terminal blocks with a lever release are especially easy to work with as they deliver quick, consistent and reliable connections.
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www.cieonline.co.uk Components in Electronics September 2025 49
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