"电工器材厂" can be translated as "Electrical Equipment Factory" or "Electrotechnical Apparatus Factory" in English.
"Electrical Equipment Factory" is a more general and commonly used term, which refers to a factory that produces various electrical equipment.
"Electrotechnical Apparatus Factory" is a more specific and technical term, where "electrotechnical" emphasizes the technical aspect related to electricity, and "apparatus" refers to devices or instruments.
In most contexts, "Electrical Equipment Factory" would be sufficient and more widely understood.