540 Power Supply

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540 Power Supply

24 Volt DC Power Supply

The 540 continuous duty industrial supply comes in an IP65 (NEMA 4X) surface type 10x10x5 cm (4x4x2 inch) water-shedding and corrosion-resistant PVC housing, that can be easily surface mounted in the plant to supply up to six 24 VDC 4-20 mA loops. The 540 supply powers loop series devices such as two-wire transmitters, PID controllers, digital indicators, and logic devices, that draw their power from the two 24 VDC wires.


Input power is field-selectable for 115/230 VAC. The supply AC is line noise and RFI suppressed, then fused at 0.125 A to protect the sensitive loop instruments from transient spikes interference or shorts. Cleaned line power is transformer reduced to the desired load voltage through an independent isolated secondary winding off the transformer. Reduced voltage circuitry is auto-reset short circuit protected. Rectification is obtained through the use of solid state rectifiers, a capacitor input filter and a bleed resister operating in conjunction with a negative feedback voltage regulation loop. The result is a constant output voltage with low ripple, regardless of varying line voltages.

Refinements include voltage output level adjustability up to 35 VDC, diode based DC surge protection, and anti-ripple filtration. Finally for redundant reliability add a second 540 in parallel powered from a separate phase.


  • Adjustable 24 VDC supply
  • Powers two-wire 4-20 mA transmitters
  • Adjustable up to 35 VDC loop drive
  • Drives up to 6 two-wire transmitter loops simultaneously
  • Comes in a durable NEMA 4X field mounting case
  • Rugged industrial design; shrugs off surges, spikes, shorts, dirt, corrosive environment, water
  • Easy wall-mounting installation in any handy location
  • Stands alone, no special mounting rails, cabinets, or electrical room environment needed
User Manual