The Siemens 6AG1333-6SB00-7AY0 is a power supply delivering a controlled, isolated 24 VDC output adjustable between 22.2 and 26.4 V. Rated for 4 A continuous (0–4 A range), with derating above 55 °C at 2%/K up to 70 °C. Input accepts 85–264 VAC (47–63 Hz) or 110–300 VDC. Efficiency hits 89 % at full load.
Enclosure is 72 mm wide, 90 mm high, 53 mm deep. IP20 rated, so no special sealing for clean indoor cabinets.
Wiring and Protection
Input terminals: L and N each accept 0.5–2.5 mm² single-core or finely stranded wire. Output terminals: + and − each have two screw terminals for the same wire range, handy for daisy-chaining to multiple loads. Internal fuse protection — no external fuse holder needed, but the feeder should have a miniature circuit breaker: recommend 10 A characteristic B or 6 A characteristic C. I²t rating is 2.5 A²·s, useful for coordination checks.
Dynamic Response and Reliability
Load step response (10–90% and 90–10%) is 1 ms typical — fast enough for digital loads and small motors. Maximum start-up delay is 0.5 s. MTBF at 40 °C is 2,391,480 hours, which translates to over 270 years — a number that assumes ideal conditions but signals a robust design.