Electronics Lab: Contactor Circuits

Training lab on contactors and 24 V DC control circuits. Includes exercises on star-delta starting, reversing, Dahlander circuits, timers, protection and switchboard wiring. Students learn to design, assemble and test control circuits for three-phase motors, with a focus on safety, reading diagrams and industrial automation. Ideal for technical and vocational training in electrical engineering, building services and maintenance.

MePA code: ABX-TP4021

About this solution

Learning outcomes

The lab aims to provide fundamental knowledge of 24 V DC control and installation circuits. Students will learn about:

Basic series and parallel circuits.
Self-holding (latching), interlocking and step-by-step or sequential switching.
Star/delta starting and reversing of asynchronous motors.
Operation of the Dahlander circuit and the step circuit.
The distinction between power and auxiliary circuits, using circuit breakers.
Use of on-delay and off-delay timers, with automatic switching.

Lab objectives

The lab aims to:

Teach the use of electrical contactors in 24 V DC command and control circuits.
Develop practical skills in wiring and configuring electrical panels with real components.
Design and test circuits for starting, stopping, reversing and dual-speed operation of three-phase motors.
Analyse technical issues such as protection, sizing and control logic.

Educational aims

The lab makes it possible to:

Train expert technicians in automation, building services and industrial electrical installation.
Consolidate theoretical knowledge through real exercises, worksheets and TechnoCards.
Read and interpret wiring diagrams, design simple circuits and check that they work.
Develop autonomy and problem solving with attention to safety and the accessibility of the training panels.
Support competence-based learning and inclusion, also with a view to work-based learning (PCTO) and career guidance.

Conclusion

The “Contactor Control II – 24 V DC Control and Installation Circuits” lab is designed to train students and future technicians in electrical automation.

Using real industrial components and an experiential approach, students design, assemble and test motor control circuits in a variety of practical scenarios.

The learning environment is complete, progressive and compliant with industry standards, promoting safety, practical autonomy and preparation for the workplace.

The solution includes inclusive tools and innovative technologies to foster active, collaborative and accessible learning.