Overview
Configured for 48 VDC power conversion in Honeywell industrial control and safety systems, the Honeywell FC-PSU-UNI4825U (UNI4825U power supply unit) converts 110-240 VAC input to a 48 VDC output at 25 A. The unit provides defined input-to-output and case isolation for system power distribution.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | FC-PSU-UNI4825U |
| Brand | Honeywell |
| Product Type | 48 VDC Switched-Mode Power Supply Unit |
| Input Voltage | 110-240 VAC |
| Operating Input Limits | 93-253 VAC |
| Input Frequency | 47-63 Hz |
| Output Voltage | 48 VDC |
| Output Current | 25 A |
| Output Power | 1200 W nominal |
| No-Load Power Consumption | 13 W |
| Efficiency | >87% at 230 VAC; >80% at 110-120 VAC |
| Hold-Up Time | Typically 100 ms at 100% load |
| Input-to-Output Isolation | 3750 Vrms |
| Input-to-Case Isolation | 2500 Vrms |
| Output-to-Case Isolation | 1500 VDC |
| Operating Temperature | -5 deg C to +70 deg C |
| Dimensions | 420.5 x 140 x 90 mm |
| Weight | Approx. 5.7 kg, including cable set |
| Approvals and Certifications | CE, TÜV, UL 508, CSA |
Power Conversion and Electrical Isolation
The FC-PSU-UNI4825U accepts a nominal 110-240 VAC input and delivers 48 VDC at up to 25 A. Its specified 93-253 VAC operating limits define the usable input range.
The unit maintains separate isolation barriers between the input, output, and case. The specified isolation ratings are 3750 Vrms from input to output, 2500 Vrms from input to case, and 1500 VDC from output to case.
The power stage also specifies a typical 100 ms hold-up time at full load. Therefore, the output can maintain its specified power path during short input interruptions within the stated hold-up condition.
Frequently Asked Questions
Q: What output does the FC-PSU-UNI4825U provide?
A: It provides 48 VDC with a maximum output current of 25 A.
Q: What input supply does the FC-PSU-UNI4825U accept?
A: It accepts 110-240 VAC nominal input, with operating limits of 93-253 VAC at 47-63 Hz.
Q: What isolation ratings are specified for this power supply?
A: The specified ratings are 3750 Vrms input-to-output, 2500 Vrms input-to-case, and 1500 VDC output-to-case.
Field Installation Guidelines
Install the power supply in a suitable enclosure or rack location that supports its 420.5 x 140 x 90 mm dimensions and approximately 5.7 kg weight.
Provide the specified AC input through appropriate upstream protection and wiring. Keep AC input conductors physically separated from low-level signal and communication wiring where practical.
Terminate protective earth and enclosure connections according to the applicable Honeywell installation documentation and site electrical standards. Maintain the specified isolation barriers during field wiring.
Route the 48 VDC output conductors separately from sensitive analog or communication circuits where practical. Secure the cable set to prevent mechanical strain on the power supply terminals and connectors.
Before energization, verify input polarity, output wiring, protective earth continuity, terminal tightness, and the absence of unintended conductive paths between isolated circuits.
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