Electrical Panel Components for Control and Distribution Panels

Terminal blocks provide a defined connection point between field cables and panel wiring. DIN-rail feed-through terminals are the most common, alongside earth, fuse, disconnect and multi-level variants.

Screw, spring-clamp and push-in connection types differ in installation speed and vibration resistance. End plates, end stops, jumpers and markers are ordered with them.

Busbars distribute current inside switchboards and panels. Copper busbars are specified by width × thickness, length and finish (bare or tinned), and are sized by current and short-circuit withstand.

Busbar supports and insulators hold the bars at the required spacing to withstand short-circuit forces.

Pushbuttons start, stop and reset machines. Flush, extended and mushroom heads, illuminated or plain, cover different duties. Emergency stops use red mushroom heads on a yellow background with latching action.

Most industrial devices are 22 mm modular units with separate head, mounting collar and contact blocks.

Selector switches choose between operating modes such as Hand–Off–Auto, Local–Remote or forward–reverse. They come in 2 or 3 positions, maintained or spring-return, and with key operation where access must be restricted.

Indicator lamps show status: running, stopped, tripped or supply healthy. Modern units use LEDs for long life and low heat, available at common control voltages.