The Siemens 5UB1535 is a NEMA socket outlet from the DELTA i-system range, featuring a spring-loaded hinged cover and rated at 20 A / 250 V AC for flush-mount indoor use. The 2-pole-plus-earth configuration and 70 × 70 mm front plate integrate with standard DELTA i-system frames. Screw terminals provide secure wiring for the higher current rating.

What does the hinged cover protect against?

The spring-loaded cover snaps shut automatically when the socket is not in use, shielding the receptacle from dust, light mechanical impact, and accidental finger contact with live terminals. In equipment rooms, workshop environments, and facilities where the socket may go unused for extended periods, the cover keeps the receptacle clean and ready. It also adds a degree of tamper resistance — the cover must be deliberately lifted to insert a plug.

250 V NEMA — what equipment uses this?

While the more familiar NEMA 5-20R operates at 125 V, the 250 V NEMA configuration serves higher-voltage North American equipment: larger server power supplies, industrial air conditioners, compressors, welding equipment, and specialty laboratory instruments. In international facilities — hotels, data centers, research labs — where such equipment must plug into a native NEMA receptacle rather than an adapter, the 5UB1535 provides a permanently installed, code-compliant solution.