YOKOGAWA PW481-51 is a PW481 power supply module designed for use with the FCU, FIO Node Unit and Optical ESB Bus Repeater Unit. The PW481 family uses a 100–120 V AC input supply, while the -51 suffix corresponds to the G3 version without explosion protection. Two compatible power supply modules can be installed when a dual-redundant power configuration is required.
FCU / FIO Node Unit / Optical ESB Bus Repeater Unit
Important configuration point: PW481-51 is a dedicated module for designated Yokogawa equipment rather than a generic standalone power supply. Output voltage and current are therefore not specified as general-purpose supply ratings.
PW48 SERIES
Same-Series Selection
The PW48 family uses different input-power configurations for different system requirements. Selecting the correct suffix is important because the input supply type and environmental configuration differ across the family.
PW481
100–120 V AC input
PW481-50 / PW481-51 / PW481-E0 / PW481-E1
PW482
220–240 V AC input
PW482-50 / PW482-51 / PW482-E0 / PW482-E1
PW484
24 V DC input
PW484-50 / PW484-51 / PW484-E0 / PW484-E1
READY TO CHECK PW481-51?
Tell us the configuration you need.
For a quotation, please provide the Part Number, Quantity, Destination, Required Date, and Machine/System. This helps us check the requested configuration and arrange the next step efficiently.
01 / Is YOKOGAWA PW481-51 the correct choice when the existing system uses 100–120 V AC?
PW481-51 belongs to the PW481 family, whose input supply is 100–120 V AC ±10% at 50/60 Hz ±3 Hz. The -51 configuration is the G3, non-explosion-protected version. The complete equipment configuration should therefore be checked before replacement rather than selecting by voltage alone.
02 / What should be checked before replacing a YOKOGAWA PW481-51 with another PW48-series module?
The input-power class and suffix configuration should be matched first. PW481 is the 100–120 V AC version, PW482 is the 220–240 V AC version, and PW484 is the 24 V DC version. A replacement should also match the intended FCU, FIO Node Unit, or Optical ESB Bus Repeater Unit configuration.
03 / Can YOKOGAWA PW481-51 be treated as a general-purpose 100–120 V AC power supply?
No. PW481-51 is a dedicated power supply module for designated Yokogawa system units. The PW48 series does not specify generic output voltage and current ratings because it is not intended to operate as a general-purpose standalone power supply.
04 / When is a dual YOKOGAWA PW481-51 configuration relevant for system maintenance?
The PW48 series supports a dual-redundant power configuration by installing two power supply modules. This arrangement is intended for compatible FCU, FIO Node Unit, and Optical ESB Bus Repeater Unit configurations where redundant power is required.
05 / Does the YOKOGAWA PW481-51 suffix affect replacement compatibility?
Yes. The -51 suffix is not simply a sequence number: it identifies the G3, non-explosion-protected configuration of the 100–120 V AC PW481 family. Other suffixes, including -50, -E0 and -E1, have different configurations, so the complete model code should be matched when preparing a replacement.
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Need PW481-51 or another automation component?
Send the part number, quantity, destination, required date and machine/system for a quotation.
After-Sales Return & Replacement
If you have any question after receiving the items, please contact us within 7 days. Returned items should remain in their original condition, together with the specific reason for the return. After the returned items are received, we will arrange the applicable return or replacement process. The buyer is responsible for the shipping costs incurred in the return or replacement process.
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