85-264VAC Universal Power Supply for Industrial PLC Systems: Complete Technical Guide

29 Januari 2026

Historical parts record: Photos and notes below belong to this record. Confirm the offered unit’s full model, condition and available test evidence before ordering.

This delivery is an unbranded wide-range switching power supply board, spec'd in the record simply as 85-264VAC — meaning it takes anything from a 100 V wall outlet to a 230 V industrial feed on one input range, as retrofit and replacement boards in PLC cabinets, HMI enclosures and control panels commonly must. The board arrived new in foam, one piece, 0.5 kg, received 2026-01-30, and ships with a 6-month warranty. No case, no terminals — a bare PCB with pin-header outputs, the form factor you meet when the original supply in a machine is dead and the mechanic wants to fit a working board onto the same standoffs and harness.

What the board shows

Block	Parts visible on the board
Input stage	Blue varistor marked CMFC 14D 620V J 3425C1221180, blue safety capacitors, and a small black NTC inrush limiter by the input pins
DC bus	KXJ 400V 120µF snap-in electrolytic — sized for a rectified 264 VAC peak plus headroom
Converter	Yellow EE-core flyback transformer, black bobbin, primary PWM controller and MOSFET on the SMD side
Output side	Four KXJ 35V 330µF electrolytics, an additional black DIP-can electrolytic, rectifier and SMD filters
Interface	Two pin-header rows (6-pin and 4-pin) carrying the DC outputs; board edge has mounting notches and a CI-AB marking
Condition / weight	New, 0.5 kg, warranty 6 months

85-264VAC power supply board top — Top view: the 400 V KXJ bus capacitor up top, the yellow EE flyback transformer at right, the blue varistor and safety capacitors at the input corner, and the four 35 V 330µF output capacitors along the bottom edge.

85-264VAC board angled view — Angled view — the 120µF/400V marking on the bus capacitor is readable, along with the CMFC 14D 620V varistor print, the two pin-header rows and the CI-AB board marking.

85-264VAC board output side detail — Close on the output corner: 6-pin and 4-pin header sockets, the KXJ 35V 330µF bank, a black DIP-can capacitor and the blue safety capacitors.

85-264VAC board solder side — Solder side: clean wave-soldered traces with the creepage slots cut between primary and secondary — the isolation barrier of a flyback supply.

Fitting it into a cabinet

Three practical notes. The 620 V varistor belongs on the AC input — correct for a board that must survive 230 V lines and their transients, so do not relocate it. The bus capacitor is rated 400 V against a peak of roughly 373 V at 264 VAC input, which is the classic wide-range margin; feeding this board DC instead of AC is a question for its schematic, not a guess. And the outputs leave on pin headers, not screw terminals — before ordering, match the header pinout and the output rail count against the dead board you are replacing, since a bare replacement has to agree with the harness at both ends.