Balluff BES021E (BES Q40KFU-PAC30F-S04G) is a square inductive proximity sensor built for reliable metal object detection, offering a 30 mm non‑flush sensing range with a configurable PNP NO/NC output for flexible integration in conveyors, packaging lines, and general automation. Its compact 40 × 40 × 62 mm PBT housing features dual status LEDs, a rugged IP67 rating, and a M12x1 4‑pin male connector, running on 10–30 VDC with a 50 Hz switching frequency for dependable performance from –25…70 °C. Choose the BES021E to upgrade your control cabinets with a durable, easy‑to‑install Balluff sensor that delivers accurate, maintenance‑friendly detection in tough industrial environments.