The ABB MEP4‑0 is a modular plastic enclosure designed to house up to four 22 mm pilot devices such as pushbuttons, selector switches, and indicator lights. This empty enclosure provides a rugged, durable mounting solution for building control stations and operator panels in industrial machinery and electrical systems. Its heavy-duty polycarbonate construction ensures good environmental protection and impact resistance, making it suitable for indoor and outdoor installations. The modular design allows flexible device combinations and accepts standard modular contact blocks and accessories for custom control layouts.