The SITOP PSU6200 Ex takes the standard PSU6200 platform and adds conformally coated printed circuit boards—purpose-built for panel builders whose enclosures face humidity, corrosive gases, or condensing atmospheres. It delivers 24VDC at 5A from a 3-phase 400–500V AC input in a compact 120W DIN rail package.

What makes the Ex version different from the standard PSU6200?

The defining difference is the painted PCB—a conformal coating applied to every circuit board that seals against moisture, sulfur-bearing gases, and airborne contaminants. In a standard power supply, unprotected boards can develop dendritic growth and corrosion over time when exposed to harsh air. The Ex version eliminates this failure mode at the board level, not through enclosure sealing. All other PSU6200 features—diagnostic LED interface, 150% power boost for 5 seconds, parallel operation via DIP switch, and metal housing—carry over unchanged.

What environments justify painted PCBs?

Conformal coating is warranted whenever the panel is installed in: wastewater treatment plants (hydrogen sulfide), chemical processing floors (corrosive vapors), coastal installations (salt spray), outdoor kiosks with condensation cycles, paper mills (sulfur compounds), and food processing lines with washdown mist. If the enclosure already has active climate control and filtration, a standard PSU6200 may be sufficient. The Ex variant is insurance for the unplanned—a door gasket that leaks, a cooler that fails over the weekend, or an installation that turns out harsher than the spec said.

Frequently Asked Questions

Does painted PCB mean this power supply is ATEX-certified for hazardous areas?

The conformal coating improves corrosion resistance but does not by itself confer ATEX or IECEx hazardous-area certification. For Zone 2 installations requiring certified equipment, verify the specific ATEX/IECEx rating on the unit's nameplate or consult the Siemens declaration of conformity for this part number.

Can I use this power supply in a single-phase panel?

No. The 6EP3433-7SC00 requires a 3-phase 400–500V AC supply. For single-phase panels needing conformally coated PCBs, Siemens offers the 6EP3333-7SC00-0AX0 (1-phase, 24VDC, 5A) which shares the same painted-PCB construction.

Is this available in bulk packaging for volume panel builders?

Yes. The -0AX0 suffix designates bulk-pack delivery, which reduces individual packaging waste and lowers per-unit cost for high-volume panel building. The product itself is identical to the individually packaged version.