If a single power supply fails on a critical production line, the entire control system can go dark. The 6AG1961‑3BA21‑7AX0 eliminates that single point of failure by combining two independent SITOP 24 V supplies into one redundant 40 A output. It is the SIPLUS variant of the PSE202U, carrying a conformal coating that protects the electronics against moisture, sulphur‑rich atmospheres, and chemical vapours — exactly the conditions found in wastewater plants, paper mills, and coastal installations.

MOSFET Decoupling

• Active MOSFET instead of diodes: each input channel is decoupled by a low‑resistance MOSFET rather than a Schottky diode. The result is a voltage drop of only ~0.5 V — versus ~1.3 V for diode‑based modules — and 96.6 % efficiency. Less heat in the cabinet, more voltage available for the load.
• 2 × 20 A inputs → 1 × 40 A output: connect two identical SITOP supplies, each sized for half the load. If one fails, the other carries the full 40 A without interruption.

Built for Harsh Environments

• SIPLUS conformal coating: protects the PCB and components against corrosive gases (H₂S, SO₂), condensation, and fungal growth — tested to EN 60721‑3‑3 class 3C2.
• Status relay: a dry contact signals when both input voltages are within the set tolerance, giving the PLC or a warning lamp a simple hardware‑level health indication.

Technical Specifications