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      Micro-Speed® CX v. 2.1 Upgrade Chart

      Can't find a model number? You may have an older model. Check the conversion chart to find out.

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

      Once you know the current model number, you can find more information about the units here.

      208-230 VAC (50/60 Hz)

      Version 2.1 Models Version 2.2 Models  
       CX™  CXH™ CXR™ CXRP™ CXRH™ FLA Hp kW Size
      M123CX M123CXH M123CXR* M123CXRP*† M123CXRH* 4.3 1 .75 a2
      M223CX M223CXH M223CXR* M223CXRP*† M223CXRH* 8.6 2 1.5 a2
      M323CX M323CXH M323CXR* M323CXRP*† M323CXRH* 10 3 2.2 a2
      M523CX M523CXH M523CXR* - M523CXRH* 16.5 5 4 a2d
      M723CX M723CXH M723CXR - M723CXRH 24 7.5 5.5 b
      M1023CX M1023CXH M1023CXR - M1023CXRH 32 10 7.5 b
      M1523CX M1523CXH M1523CXR - M1523CXRH 48 15 11 d3
      M2023CX M2023CXH M2023CXR - M2023CXRH 56 20 15 d3
          * Regen Resistors Built-in Heavy-Duty Class D      †Built-in Solid-State Brake Relay

      460 VAC (380-415 VAC) (50/60 Hz)

      For 380-415 VAC models substitute the 46 with 38 and only use FLA to size 

      Version 2.1 Models Version 2.2 Models  
       CX™  CXH™ CXR™ CXRP™ CXRH™ FLA Hp kW Size
      M146CX M146CXH M146CXR* M146CXRP*† M146CXRH* 2.4 1 .75 a2
      M246CX M246CXH M246CXR* M246Cd3XRP*† M246CXRH* 4 2 1.5 a2
      M346CX M346CXH M346CXR* M346CXRP*† M346CXRH* 5.6 3 2.2 a2
      M546CX M546CXH M546CXR* M546CXRP*† M546CXRH* 9 5 4 a2
      M746CX M746CXH M746CXR - M746CXRH 12.5 7.5 5.5 b
      M1046CX M1046CXH M1046CXR - M1046CXRH 16.5 10 7.5 b
      M1546CX M1546CXH M1546CXR - M1546CXRH 24 15 11  
      M2046CX M2046CXH M2046CXR - M2046CXRH 29 20 15 d3
          * Regen Resistors Built-In Heavy Duty Class D      †Built-in Solid-State Brake Relay

      575 VAC (50/60 Hz)

      Version 2.1 Models
      		 Version 2.2 Models  
       CX™  CXH™ CXR™ CXRP™ CXRH™ FLA Hp kW Size
      M157CX M157CXH M157CXR* M157CXRP*† M157CXRH* 1.8 1 .75 a2
      M257CX M257CXH M257CXR* M257CXRP*† M257CXRH* 3.2 2 1.5 a2
      M357CX M357CXH M357CXR* M357CXRP*† M357CXRH* 4.7 3 2.2 a2
      M557CX M557CXH M557CXR* M557CXRP*† M557CXRH* 7.2 5 4 a2
      M757CX M757CXH M757CXR - M757CXRH 9.7 7.5 5.5 b
      M1057CX M1057CXH M1057CXR - M1057CXRH 13 10 7.5 b
      M1557CX M1557CXH M1557CXR - M1557CXRH 19 15 11 d3
      M2057CX M2057CXH M2057CXR - M2057CXRH 23 20 15 d2
          * Regen Resistors Built-In Heavy-Duty Class D      †Built-in Solid-State Brake Relay