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Micro-Speed® CX™ Up-Grade-Path™ Tables

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Front-angled view of a current Micro-Speed® CX-R “b” frame size (7.5-10 HP).

Do you have an older Micro-Speed® CX™ model that you are replacing/upgrading? Model numbers have changed since our software version 2.2 update. Use the charts below to find the direct replacement for your model, then click on the current product link for more details.

Why did the model numbers change?

All Micro-Speed® CX™ drives now include Version 2.2 updates, including I2T motor thermal protection. The I2T protection feature removes the need to have separate motor overload relays in your control panel. Prior to Version 2.2, the CX series did not have model numbers ending with the letter “R”. However, the CXR™ Version 2.2 is a direct replacement of previous CX™ models (versions 2.1 and earlier).

Legacy Models* HP (kW)Max Amps (FLA)Size Reduced?**Replacement Models*
(Click to view details)
Upgrade to this model if your previous model included a brake board (SSB1 or SSB2)
M123 |M123CX1 (0.75)4.3 ASame (a2)M123CXRM123CXRP
M123H | M123CXH1 (0.75)4.3 ASame (a2)M123CXRHN/A
M223 | M223CX2 (1.5)8.6 ASame (a2)M223CXRM223CXRP
M223H | M223CXH2 (1.5)8.6 ASame (a2)M223CXRHN/A
M323 | M323CX3 (2.2)10.0 ASame (a2)M323CXRM323CXRP
M323H | M323CXH3 (2.2)10.0 ASame (a2)M323CXRHN/A
M523 | M523CX5 (4)16.5 ASame (a2d)M523CXRN/A
M523H | M523CXH5 (4)16.5 ASame (a2d)M523CXRHN/A
M723 | M723CX7.5 (5.5)24 ASame (b)M723CXRN/A
M723H | M723CXH7.5 (5.5)24 ASame (b)M723CXRHN/A
M1023 | M1023CX10 (7.5)32 ASame (b)M1023CXRN/A
M1023H | M1023CXH10 (7.5)32 ASame (b)M1023CXRHN/A
M1523 | M1523CX15 (11)48 AYes (d to d2 to d3)M1523CXRN/A
M1523H | M1523CXH15 (11)48 A Yes (d to d2 to d3)M1523CXRHN/A
M2023 | M2023CX20 (15)56 AYes (d to d2 to d3)M2023CXRN/A
M2023H | M2023CXH20 (15)56 A Yes (d to d2 to d3)M2023CXRHN/A
M2523 | M2523CX | M2523CXR25 (18.5)68 AYes (e to e2)MMX2523UN/A
M2523H | M2523CXH | M2523CXRH25 (18.5)68 AYes (e to e2)MMX2523UHN/A
M3023 | M3023CX | M3023CXR30 (22)95 AYes (e to e2)MMX3023UN/A
M3023H | M3023CXH | M3023CXRH30 (22)95 AYes (e to e2)MMX3023UHN/A
M4023 |M4023CX | M4023CXR40 (30)119 ASame (f2)MMX4023UN/A
M4023H |M4023CXH | M4023CXRH40 (30)119 ASame (f2)MMX4023UHN/A
*Or these same models with a “-XX” suffix. Models ending with “H” are preset for hoisting/lifting applications.

** Refer to the “CX (R, RH, & RP)™ Frame Sizes” area below for downloadable dimensional drawings (for size comparison).

  • Models 25 – 40HP are no longer available in the CX series. View the suggested MX-U™ replacement models shown in the table.
Legacy Models* kWMax Amps (FLA)Size Reduced?**Replacement Models*
(Click to view details)
Upgrade to this model if your previous model included a brake board (SSB1 or SSB2)
M138 | M138CX1.12.4 ASame (a2)M138CXRM138CXRP
M138H | M138CXH1.12.4 ASame (a2)M138CXRHN/A
M238 | M238CX1.54 ASame (a2)M238CXRM238CXRP
M238H | M238CXH1.54 ASame (a2)M238CXRHN/A
M338 | M338CX2.25.6 ASame (a2)M338CXRM338CXRP
M338H | M338CXH2.25.6 ASame (a2)M338CXRHN/A
M538 | M538CX49 ASame (a2)M538CXRM538CXRP
M538H | M538CXH49 ASame (a2)M538CXRHN/A
M738 | M738CX5.512.5 ASame (b)M738CXRN/A
M738H | M738CXH5.512.5 ASame (b)M738CXRHN/A
M1038 | M1038CX7.516.5 ASame (b)M1038CXRN/A
M1038H | M1038CXH7.516.5 ASame (b)M1038CXRHN/A
M1538 | M1538CX1124 AYes (d to d3)M1538CXRN/A
M1538H | M1538CXH1124 AYes (d to d3)M1538CXRHN/A
M2038 | M2038CX1529 AYes (d to d3)M2038CXRN/A
M2038H | M2038CXH1529 AYes (d to d3)M2038CXRHN/A
M2538 | M2538CX | M2538CXR18.535 AYes (d to d2)MMX2538UN/A
M2538H | M2538CXH | M2538CXRH18.535 AYes (d to d2)MMX2538UHN/A
M3038 | M3038CX | M3038CXR2245 AYes (d to d2)MMX3038UN/A
M3038H | M3038CXH | M3038CXRH2245 AYes (d to d2)MMX3038UHN/A
M4038 | M4038CX | M4038CXR3056 AYes (e to e2)MMX4038UN/A
M4038H | M4038CXH | M4038CXRH3056 AYes (e to e2)MMX4038UHN/A
*Or these same models with a “-XX” suffix. Models ending with “H” are preset for hoisting/lifting applications.

** Refer to the “CX (R, RH, & RP)™ Frame Sizes” area below for downloadable dimensional drawings (for size comparison).

  • Models 25 – 40HP are no longer available in the CX series. View the suggested MX-U™ replacement models shown in the table.
Legacy Models*HP (kW)Max Amps (FLA)Size Reduced?**Replacement Models* (Click to view details)Upgrade to this model if your previous model included a brake board (SSB1 or SSB2)
M146 | M146CX1 (0.75)2.4 ASame (a2)M146CXRM146CXRP
M146H | M146CXH1 (0.75)2.4 ASame (a2)M146CXRHN/A
M246 | M246CX2 (1.5)4 ASame (a2)M246CXRM246CXRP
M246H | M246CXH2 (1.5)4 ASame (a2)M246CXRHN/A
M346 | M346CX3 (2.2)5.6 ASame (a2)M346CXRM346CXRP
M346H | M346CXH3 (2.2)5.6 ASame (a2)M346CXRHN/A
M546 | M546CX5 (4)9 ASame (a2)M546CXRM546CXRP
M546H | M546CXH5 (4)9 ASame (a2)M546CXRHN/A
M746 | M746CX7.5 (5.5)12.5 ASame (b)M746CXRN/A
M746H | M746CXH7.5 (5.5)12.5 ASame (b)M746CXRHN/A
M1046 | M1046CX10 (7.5)16.5 ASame (b)M1046CXRN/A
M1046H | M1046CXH10 (7.5)16.5 ASame (b)M1046CXRHN/A
M1546 | M1546CX15 (11)24 AYes (d to d3)M1546CXRN/A
M1546H | M1546CXH15 (11)24 AYes (d to d3)M1546CXRHN/A
M2046 | M2046CX20 (15)29 AYes (d to d3)M2046CXRN/A
M2046H | M2046CXH20 (15)29 AYes (d to d3)M2046CXRHN/A
M2546 | M2546CX | M2546CXR25 (18.5)35 AYes (d to d2)MMX2546UN/A
M2546H | M2546CXH | M2546CXRH25 (18.5)35 AYes (d to d2)MMX2546UHN/A
M3046 | M3046CX | M3046CXR30 (22)45 AYes (d to d2)MMX3046UN/A
M3046H | M3046CXH | M3046CXRH30 (22)45 AYes (d to d2)MMX3046UHN/A
M4046 | M4046CX | M4046CXR40 (30)56 AYes (e to e2)MMX4046UN/A
M4046H | M4046CXH | M4046CXRH40 (30)56 AYes (e to e2)MMX4046UHN/A
*Or these same models with a “-XX” suffix. Models ending with “H” are preset for hoisting/lifting applications.

** Refer to the “CX (R, RH, & RP)™ Frame Sizes” area below for downloadable dimensional drawings (for size comparison).

  • Models 25 – 40HP are no longer available in the CX series. View the suggested MX-U™ replacement models shown in the table.

Legacy Models* HP (kW)Max Amps (FLA)Size Reduced?**Replacement Models*
(Click to view details)
Upgrade to this model if your previous model included a brake board (SSB1 or SSB2)
M157 | M157CX1 (0.75)1.8 ASame (a2)M157CXRM157CXRP
M157H | M157CXH1 (0.75)1.8 ASame (a2)M157CXRHN/A
M257 | M257CX2 (1.5)3.2 ASame (a2)M257CXRM257CXRP
M257H | M257CXH2 (1.5)3.2 ASame (a2)M257CXRHN/A
M357 | M357CX3 (2.2)4.7 ASame (a2)M357CXRM357CXRP
M357H | M357CXH3 (2.2)4.7 ASame (a2)M357CXRHN/A
M557 | M557CX5 (4)7.2 ASame (a2)M557CXRM557CXRP
M557H | M557CXH5 (4)7.2 ASame (a2)M557CXRHN/A
M757 | M757CX7.5 (5.5)9.7 ASame (b)M757CXRN/A
M757H | M757CXH7.5 (5.5)9.7 ASame (b)M757CXRHN/A
M1057 | M1057CX10 (7.5)13 ASame (b)M1057CXRN/A
M1057H | M1057CXH10 (7.5)13 ASame (b)M1057CXRHN/A
M1557 | M1557CX15 (11)19 AYes (d to d3)M1557CXRN/A
M1557H | M1557CXH15 (11)19 AYes (d to d3)M1557CXRHN/A
M2057 | M2057CX20 (15)23 AYes (d to d2)M2057CXRN/A
M2057H | M2057CXH20 (15)23 AYes (d to d2)M2057CXRHN/A
M2557 | M2557CX | M2557CXR25 (18.5)28 AYes (e to e2 to d2)MMX2557UN/A
M2557H | M2557CXH | M2557CXRH25 (18.5)28 AYes (e to e2 to d2)MMX2557UHN/A
M3057 | M3057CX | M3057CXR30 (22)36 AYes (e to e2 to d2)MMX3057UN/A
M3057H | M3057CXH | M3057CXRH30 (22)36 AYes (e to e2 to d2)MMX3057UHN/A
M4057 | M4057CX | M4057CXR40 (30)45 AYes (e to e2)MMX4057UN/A
M4057H | M4057CXH | M4057CXRH40 (30)45 AYes (e to e2)MMX4057UHN/A
*Or these same models with a “-XX” suffix. Models ending with “H” are preset for hoisting/lifting applications.

** Refer to the “CX (R, RH, & RP)™ Frame Sizes” area below for downloadable dimensional drawings (for size comparison).

  • Models 25 – 40HP are no longer available in the CX series. View the suggested MX-U™ replacement models shown in the table.

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