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PowerFlex Drive Decoder

Type an Allen-Bradley PowerFlex catalog number (25B-B2P5N104, 20G11RB2P2JA0NNNNN, 21G14*C460JN0NNNNN) and read the output current, Normal-Duty motor HP/kW, voltage class, frame, enclosure, and options. Built around the real traps: the rating code is an output current not a horsepower, the 523 and 525 share the same Normal-Duty rating for a given code, 750-series HP/kW is voltage-dependent, and a 750 enclosure or braking code that is wrong for the frame is an impossible drive, not a typo.

A reference decoder for Allen-Bradley / Rockwell PowerFlex catalog numbers. It branches on the catalog prefix (positions 1-3) because the two product lines do not share a grammar: the 520-series (25A = PowerFlex 523, 25B = PowerFlex 525) is dash-delimited, e.g. 25B-B2P5N104, while the 750-series (20F = 753, 20G = 755, 21G = 755 with Options) is a fixed 18-character string with no dashes, e.g. 20G11RB2P2JA0NNNNN. For each position the tool decodes the meaning, then looks up the rated output current, Normal-Duty motor HP/kW, voltage class, frame, and enclosure from Rockwell's published power-ratings tables, keyed on family + voltage + code (and, for the 520, the EMC-filter variant) so the right figures come back for the supply. The rating code is treated as an opaque key: output amps are read from the matched row, never parsed out of the digits. The tool's reason to exist is its validity verdict. It marks physically impossible 750-series combinations hard-invalid, not merely warned: an enclosure code used outside its valid frames (R is Frame 1, F is Frames 2-5, G/N are Frames 2-7, the cabinet codes B/J/K/L/P/W/Y/T are Frames 8-10), dynamic-braking code A on a Frames-8-10 drive (those require N), or a door-HIM digit outside {0,2,4}. It recognizes legacy PowerFlex families (4, 40, 40P, 400, 70, 700, 7000, 700S/700H, 527) by prefix without fabricating a rating, and when a 750 code is structurally sound but absent from the extracted ratings table it returns the structural decode with a clear instruction to verify against the PowerFlex 750-Series Technical Data rather than inventing a number.

Pro Tip: The rating field is an output current, not horsepower. In a 520-series code the three characters after the voltage letter are amps with 'P' as the decimal point (2P5 = 2.5 A, 048 = 48.3 A); in a 750-series code positions 8-10 are the current with 'K' for thousands (2K1 = 2150 A). Two traps catch people: the 523 and 525 publish the SAME Normal-Duty HP/kW for a shared current code (the two HP/kW pairs in the 520 table are Normal Duty | Heavy Duty, not separate 523/525 columns) and only a few low-current codes like the 1.6 A 1P6 are 523-only; and on the 750-series the same current code yields different HP/kW at 240/400/480/600/690 V, with HP published on the 480V/600V tables, kW on the 400V/690V tables, and both on the 240V table. Size the motor on FLA against the output current, not the HP label, and confirm Normal-Duty vs Heavy-Duty against the drive nameplate.

Read the PowerFlex Drive Guide for the families, the real traps, and what the decoder will not do

PowerFlex Drive Guide →

Decode the motor nameplate the drive runs

Motor Nameplate Decoder →

Cross-shop the equivalent Yaskawa drive

Yaskawa Drive Decoder →

Cross-shop the equivalent Danfoss VLT drive

Danfoss VLT Drive Decoder →

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PowerFlex Drive Decoder
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How It Works

  1. Type the catalog number

    Enter the PowerFlex catalog number off the drive nameplate. 520-series codes are dash-delimited (25B-B2P5N104); 750-series codes are a fixed 18-character string with no dashes (20G11RB2P2JA0NNNNN). The 21G enclosure placeholder '*' at position 6 is accepted. Lowercase, spaces, and unicode dashes are normalized before decoding.

  2. Read the catalog-number breakdown

    The colored breakdown strip splits the code position by position: drive family, voltage class, output-current rating, enclosure, interface/filter and braking for the 520; family, frame, input type, enclosure, voltage, rating, filtering, dynamic braking, door HIM, and the option block for the 750. Each tile shows the raw characters and their decoded meaning.

  3. Read the ratings card

    On an exact match the ratings card shows the output current in amps, the Normal-Duty motor HP/kW, the voltage class, the frame, and the enclosure, all read from Rockwell's published tables. The HP/kW shown is the Normal-Duty figure; the card reminds you the 520 allows 150% overload for 60 s / 200% for 3 s and the 750 publishes separate Normal-Duty and Heavy-Duty ratings.

  4. Check the validity verdict

    If the structure decodes but the combination is not a real drive, a 'Not a cataloged drive' banner explains why and, where possible, suggests the nearest real catalog number for that family and voltage. Impossible 750-series field combinations (enclosure wrong for the frame, braking A on Frames 8-10, an invalid door-HIM digit) are reported as hard-invalid, not just a warning.

  5. Read 'What this means for the job'

    The derived layer translates the decode into sizing and install guidance: the motor the drive sizes, the supply phase and voltage, the enclosure/IP rating and frame note, the EMC-filter meaning on the 520, and a 'what to check next' list. For a 750 code not in the extracted table it tells you to verify the exact current, Normal-Duty and Heavy-Duty HP/kW against 750-TD001.

  6. Export the decode

    PDF export produces a branded report with the catalog-number breakdown, ratings, the derived guidance, field notes, warnings, and the Rockwell source citation. CSV and shareable-link export carry the same decode context for documentation, not as an order or installation authorization.

Built For

  • A maintenance tech decoding 25B-B2P5N104 off a failed drive to confirm it is a PowerFlex 525, 2.5 A, 240V 3-phase before sourcing a replacement
  • A panel builder confirming 25A-B048N104 and 25B-B048N104 are both 48.3 A / 15 HP Normal-Duty so a 523 can be cross-checked against a 525 of the same rating
  • An electrician catching that 25B-V1P6N104 is invalid because the 1.6 A (1P6) code is 523-only, with no 525 row in the source
  • A controls engineer reading 20G11RB2P2JA0NNNNN as a Frame-1 PowerFlex 755, 2.2 A, 240V, before specifying a like-for-like spare
  • A specifying engineer decoding 21G14*C460JN0NNNNN as a 755 with Options cabinet drive, 460 A / 250 kW at 400V, Frame 8, and understanding the '*' is an enclosure-to-be-specified placeholder
  • An estimator confirming that 21G14NC460JN0NNNNN is impossible because enclosure code N is a Frames 2-7 code on a Frames-8-10 cabinet drive
  • A reliability planner pulling a decoded PowerFlex catalog number into a PDF for an asset record before ordering through distribution
  • A field tech cross-shopping a PowerFlex against an ABB ACS drive of similar current and voltage when planning a substitution

Features & Capabilities

Two Formats, One Decoder

The engine branches on the prefix first: the dash-delimited 520-series (25A/25B) and the fixed 18-character 750-series (20F/20G/21G) are decoded by separate positional grammars, so a 520 dash code and a 750 fixed string each parse against the right rules instead of one averaged scheme.

Rating Code Is an Output Current, Not Power

The rating field is matched as an opaque lookup key. Output amps, HP, and kW are read from Rockwell's published ratings row, never parsed from the code digits, so the 'P' decimal point and 'K' thousands marker in codes like 2P5, 048, and 2K1 are handled without arithmetic errors.

523 = 525 Normal-Duty, Honestly

For a shared current code the 523 and 525 publish the same Normal-Duty HP/kW. The 520 table's two HP/kW pairs are Normal Duty and Heavy Duty, not separate 523/525 columns, and the tool reports the Normal-Duty figure. The genuine catalog difference is that a few low-current codes (the 1.6 A 1P6) are 523-only.

Voltage-Dependent 750 HP/kW

On the 750-series the same output-current code yields different HP/kW at 240/400/480/600/690 V, so the rating is keyed on family + voltage + code. The published tables give HP on the 480V/600V columns and kW on the 400V/690V columns; the tool reports whichever Rockwell published and never converts the missing one.

Frame-Gated Enclosure and Braking Verdict

750-series position-6 enclosure codes are validated against the physical frame (R = Frame 1, F = Frames 2-5, G/N = Frames 2-7, the cabinet codes B/J/K/L/P/W/Y/T = Frames 8-10), and braking code A on Frames 8-10 (which require N) and a door-HIM digit outside {0,2,4} are caught as impossible field combinations rather than passed through.

Hard-Invalid, Not Just Warned

A physically or electrically impossible 750 combination forces the verdict to invalid, even when the rest of the structure decodes cleanly and a rating row exists. The descriptive reason is kept so you know exactly which field is wrong, and a wrong voltage code or an uncataloged code is distinguished from a sound code simply absent from the extracted table.

The 21G '*' Placeholder Is Understood

PowerFlex 755 with Options (21G) catalog numbers carry a '*' at position 6 because the cabinet/enclosure is selected separately. The tool treats it as a valid enclosure-to-be-specified placeholder with an explanatory note, not as an unknown character or an error.

Never Fabricates a Rating

Legacy PowerFlex families (4, 40, 40P, 400, 70, 700, 7000, 700S/700H, 527) are recognized by prefix without inventing numbers, and a structurally sound 750 code that is not in the extracted ratings table returns the structural decode plus an instruction to verify against 750-TD001 rather than a guessed current or HP.

Comparison

Family Prefix Format Voltage classes Frames Reported power
PowerFlex 523 25A Dash-delimited 520-series 120V 1ph, 240V 1ph/3ph, 480V 3ph, 600V 3ph A-E Normal-Duty HP/kW (1.6 A 1P6 codes are 523-only)
PowerFlex 525 25B Dash-delimited 520-series 120V 1ph, 240V 1ph/3ph, 480V 3ph, 600V 3ph A-E Normal-Duty HP/kW (same as 523 for a shared code)
PowerFlex 753 20F Fixed 18-char 750-series 240/400/480/600/690 V 1-7 Voltage-dependent HP/kW (up to about 400 HP / 270 kW)
PowerFlex 755 20G Fixed 18-char 750-series 240/400/480/600/690 V 1-10 Voltage-dependent HP/kW (high-power cabinet frames 8-10)
755 with Options 21G Fixed 18-char 750-series 400/480/600/690 V 8-10 only Voltage-dependent HP/kW; position 6 is the '*' enclosure placeholder

References

  • Rockwell Automation PowerFlex 520-Series Adjustable Frequency AC Drives - Technical Data, Publication 520-TD001 (catalog number explanation and power-ratings tables by voltage class)
  • Rockwell Automation PowerFlex 520-Series Adjustable Frequency AC Drives - User Manual, Publication 520-UM001 (cross-check on the 520 ratings)
  • Rockwell Automation PowerFlex 750-Series AC Drives - Technical Data, Publication 750-TD001 (18-position catalog number explanation and power-ratings tables for 208/240/400/480/600/690 V)
  • Rockwell Automation PowerFlex 750-Series Drives Selection Guide, Publication PFLEX-SG002 (June 2024) - frame, enclosure, and option-code reference

Frequently Asked Questions

It is the drive output current in amps, not horsepower. In a 520-series code the three characters after the voltage letter are amps with 'P' as the decimal point, so 2P5 is 2.5 A and 048 is 48.3 A. In a 750-series code positions 8-10 are the current, with 'K' marking thousands, so 2K1 is 2150 A. The decoder reads the rated current, HP, and kW from Rockwell's published table using the code as a lookup key; it does not calculate power from the code.
No, not for the Normal-Duty rating. The 520-series ratings table lists two HP/kW pairs per drive, which are Normal Duty and Heavy Duty, not separate 523 and 525 columns. For a shared current code the 523 and 525 publish the same Normal-Duty HP/kW: 25A-B048N104 and 25B-B048N104 are both 48.3 A and 15 HP / 11 kW Normal Duty (the Heavy-Duty figure for that row is 10 HP / 7.5 kW). The real catalog difference is that a few low-current codes, such as the 1.6 A 1P6, are listed only for the 523.
Because horsepower scales with voltage at a given current, Rockwell publishes a different HP/kW for the same output-current code at 240, 400, 480, 600, and 690 V. The decoder keys the rating on family plus voltage plus code so the figure matches the supply. The published tables also split which unit is printed: HP appears on the 480V and 600V tables and kW on the 400V and 690V tables, so one of the two may show as not published rather than being converted.
It is the enclosure-to-be-specified placeholder used on PowerFlex 755 with Options (21G) catalog numbers. The cabinet/enclosure is selected separately, so the printed number carries a '*' that the customer replaces with the chosen cabinet code (B/J/K/L/P/W/Y/T) at order time. The decoder treats it as a valid placeholder with an explanatory note, not as an error or an unknown character. Capture the actual cabinet code from the order or the cabinet label, since it sets the IP/Type rating and cabinet depth.
Because certain field combinations cannot exist on a real drive. The position-6 enclosure code is frame-gated (R is Frame 1, F is Frames 2-5, G/N are Frames 2-7, the cabinet codes B/J/K/L/P/W/Y/T are Frames 8-10), dynamic-braking code A is a Frames 1-7 option so it is impossible on a Frames-8-10 drive (those require N), and the door-HIM digit must be 0, 2, or 4. When one of these is violated the decoder marks the catalog number hard-invalid and names the conflicting field rather than passing it through with a guessed rating.
It is the EMC filter. The trailing N104 means no EMC filter; N114 means the EMC filter is installed. The filter affects emissions compliance and supply compatibility: its line-to-ground capacitance means the N114 variant should not be used on an ungrounded/IT or corner-grounded delta supply without disconnecting the filter. The decoder keys the rating on the filter variant so it never confuses the N104 and N114 rows.
It recognizes them by catalog prefix (22A = PowerFlex 4, 22B = 40, 22C = 400, 22D = 40P, 20A = 70, 20B = 700, 20C = 7000, 20D = 700S/700H, 25C = 527) and tells you which legacy family it is, but it does not decode their ratings in this version. It never fabricates a current or HP for a family that is not in its data set; it identifies the drive and points you to the right documentation.
No. It is a reference decode of the catalog number against published Rockwell tables. It does not size a motor for your load, certify a replacement, approve an enclosure for an environment, or authorize an installation. Verify the decoded current, HP/kW, voltage class, frame, and enclosure against the drive nameplate and current Rockwell documentation, and confirm Normal-Duty versus Heavy-Duty for your actual load, before ordering or installing.
Disclaimer: This tool is a reference decoder for Allen-Bradley / Rockwell PowerFlex catalog numbers, read from published Rockwell Automation technical data (520-TD001 and 750-TD001) and selection guides. It reports the output current, Normal-Duty motor HP/kW, voltage class, frame, enclosure, and options the catalog number encodes, and flags impossible combinations. It does not size a motor or drive for a specific load, certify a replacement or substitution, select an enclosure or cabinet for an environment, approve a supply system, or authorize ordering or installation. The 750-series ratings transcribed here are extensive but may not contain every code; a code not in the table is returned as a structural decode with an instruction to verify against the PowerFlex 750-Series Technical Data, never as a guessed number. Always verify the decoded values against the drive nameplate, the current Rockwell Automation documentation, and a qualified professional before ordering, configuring, or installing. ToolGrit is not affiliated with Rockwell Automation or Allen-Bradley.

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