Micro-Speed® CX v. 2.1 Upgrade Chart

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