About this guide

Mairun Engineering Guide is an educational knowledge hub from Qinhuangdao Mairun Electronic Technology Development Co., Ltd., a company working with industrial electrical instruments and protection equipment.

What we publish

We publish practical explanations of motor protection, power measurement, switchgear environment control, temperature monitoring and maintenance records. Articles are written for engineers, technicians, students and procurement teams who need a clear starting point before consulting equipment documentation.

Editorial boundaries

Examples are original educational examples. They are not official standards, a substitute for commissioning instructions or a guarantee that a product will solve a site problem. Electrical work must be performed by qualified personnel under the applicable safety procedure.

Corrections and feedback

If you find a technical error or want to suggest a topic, please use the contact details on our contact page.