Step-by-Step Construction of a Classic Industrial Start–Stop Circuit

Summary:
This video demonstrates the wiring and testing of a relay latch using a start pushbutton, a stop pushbutton, and a control relay. It also shows how the panel lamp is added on a separate rung for status indication.

Why This Matters:
Relay latches remain fundamental in industrial installations where simple and reliable control is required. Understanding their wiring improves confidence when working inside panels that use discrete start–stop logic.

Content covered in the video:
• Wiring the initial series path through the start button, stop button, and relay coil exactly as shown on the schematic.
• Verifying correct coil activation and confirming that an open stop contact disables the circuit.
• Adding the latching path using the relay’s normally open auxiliary contact and connecting it to the junction between the pushbuttons.
• Explaining the three-wire naming convention for this style of start–stop circuit.
• Wiring the panel lamp through a normally open relay contact on its own rung.
• Demonstrating full operation of start, stop, and lamp indication under power.
• Showing the effect of manually forcing the relay mechanism and noting potential hazards in real control panels.