The SITOP PSU4200 6EP3333-3SB00-0AX0 is the 120W variant in the PSU4200 series, delivering 24VDC at 5A from the same 50mm-wide DIN rail housing as the 3A model. The key upgrade over the 72W version is the addition of a floating relay contact (terminals 13-14, NO, rated 60VDC/0.3A) that provides "DC OK" status to a PLC digital input — enabling the control system to detect and annunciate a power supply fault without adding an external monitoring relay to the bill of materials.

Power and Efficiency

Compared to the 3A model, the 5A variant improves efficiency from 85% to 87%, reducing waste heat at full load from 13W to 18W absolute — a meaningful difference in a densely packed control cabinet where every watt of heat must be ventilated. The auto-ranging input accepts 85-264VAC (47-63Hz) and the output is adjustable from 24 to 28VDC. Short-circuit protection uses constant-current limiting at approximately 6A with automatic recovery. Derating of 4%/K applies from +60°C to +70°C ambient, compared to no derating on the 3A model.

Straightforward Integration

Push-in terminals on both line and load sides, wall-mounting provision, and parallel operation of up to two units make the PSU4200 a flexible building block for control panel power distribution. The metal housing contributes to both heat dissipation and mechanical robustness. Certifications include CE, cULus (UL 508), and CB Scheme, with EN 55032 Class A EMC emissions compliance. MTBF at 40°C is 1,700,000 hours.

Key Decision Parameters

For the 3A (72W) entry model in the same series without the relay contact, see the 6EP3332-3SB00-0AX0.