Reducer Motor Controls | McMaster-Carr

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48 Products

About Motor Switches and Starters

Set these controls to automatically adjust motor speed. Wire a potentiometer (not included) for remote manual control.

For technical drawings and 3-D models, click on a part number.

			Output		Input Signal
Horsepower, hp	Input Voltage	Current, A	Voltage	Frequency, Hz	Voltage	Current, mA	Ht.	Wd.	Mounting Fasteners Included	Mounting Hole Diameter (No. of)	Environmental Rating	Specifications Met		Each
Single-Phase Input
Reversing
1	115V AC/230V AC	4.2	0-230V AC	0-500	0-10V DC	4-20	7.5"	3.9"	No	0.22" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	0000000
1 1/2	115V AC/230V AC	6	230V AC	0-120	0-10V DC	4-20	7.5"	3.9"	Yes	0.2" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	000000
3	200-240V AC	9.6	0-230V AC	0-500	0-10V DC	4-20	7.5"	3.9"	No	0.22" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	000000
Single-Phase/Three-Phase Input
Reversing
2	200-240V AC	7	0-230V AC	0-500	0-10V DC	4-20	7.5"	3.9"	No	0.22" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	000000
Three-Phase Input
Reversing
1	200-240V AC	4.2	0-230V AC	0-500	0-10V DC	4-20	7.5"	3.9"	No	0.22" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	000000
1	400-480V AC	2.1	400-480V AC	0-120	0-10V DC	4-20	7.5"	3.89"	No	0.21" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	000000
3	200-240V AC	9.6	0-230V AC	0-500	0-10V DC	4-20	7.5"	3.9"	No	0.22" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	000000
5	200-240V AC	18	200-240V AC	0-500	0-10V DC	4-20	10.75"	5.08"	No	0.24" (4)	__	UL Listed C-UL Listed CE Marked	0000000	00000000
5	400-480V AC	8.2	400-480V AC	0-500	0-10V DC	4-20	7.5"	3.9"	No	0.22" (4)	NEMA 1, IP31	UL Listed C-UL Listed CE Marked	0000000	000000

Washdown Programmable Three-Phase AC Motor Speed Controls

Rated NEMA 4, these controls are protected from washdowns. Set them to automatically adjust motor speed. Wire a potentiometer (not included) for remote manual control.

Controls rated NEMA 12 also protect against splashes of oil and coolant when used indoors.

For technical drawings and 3-D models, click on a part number.

			Output		Input Signal
Horsepower, hp	Input Voltage	Current, A	Voltage	Frequency, Hz	Voltage	Current, mA	Ht.	Wd.	Reversing Capability	Environmental Rating	Specifications Met		Each
Single-Phase Input
1	200-240V AC	4.2	200V AC-240V AC	0-120	0-10V DC	4-20	8"	6.5"	Reversing	NEMA 4, NEMA 12, IP65	UL Listed C-UL Listed CE Marked	0000000	0000000
Single-Phase/Three-Phase Input
2	200-240V AC	7	200V AC-240V AC	0-500	0-10V DC	4-20	8"	6.28"	Reversing	NEMA 4, IP65	UL Listed C-UL Listed CE Marked	0000000	000000
Three-Phase Input
2	400-480V AC	3.4	400V AC-480V AC	0-500	0-10V DC	4-20	8"	6.28"	Reversing	NEMA 4, IP65	UL Listed C-UL Listed CE Marked	0000000	00000000
3	400-480V AC	4.8	400V AC-480V AC	0-500	0-10V DC	4-20	8"	6.28"	Reversing	NEMA 4, IP65	UL Listed C-UL Listed CE Marked	0000000	00000000

DIN-Rail Mount Programmable Three-Phase AC Motor Speed Controls

Mount these controls to DIN rail inside a control panel. Set them to automatically adjust motor speed. Wire a potentiometer (not included) for remote manual control.

			Output		Input Signal
Horsepower, hp	Input Voltage	Current, A	Voltage	Frequency, Hz	Voltage	Current, mA	Ht.	Wd.	Reversing Capability	For DIN Rail Ht., mm	Specifications Met		Each
Single-Phase Input
1/2	100-120V AC	3	115V AC	0-400	0-10V DC	4-20	5.98"	2.83"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	0000000
1	100-120V AC	4.8	115V AC	0-400	0-10V DC	4-20	8.66"	4.29"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	000000
1	200-240V AC	3.7	230V AC	0-320	0-10V DC	4-20	7.68"	3.54"	Reversing	35	UL Listed C-UL Listed CE Marked	0000000	000000
1	200-240V AC	4.8	230V AC	0-400	0-10V DC	4-20	5.98"	2.83"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	000000
2	200-240V AC	7.8	230V AC	0-400	0-10V DC	4-20	8.66"	4.29"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	00000000
3	200-240V AC	11	230V AC	0-400	0-10V DC	4-20	8.66"	4.29"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	00000000
Three-Phase Input
1	200-240V AC	4.8	230V AC	0-400	0-10V DC	4-20	5.98"	2.83"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	000000
1	380-480V AC	2.2	400V AC	0-400	0-10V DC	4-20	5.98"	2.83"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	000000
2	200-240V AC	7.8	230V AC	0-400	0-10V DC	4-20	5.98"	2.83"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	000000
3	200-240V AC	11	230V AC	0-400	0-10V DC	4-20	8.66"	4.29"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	00000000
3	380-480V AC	5.6	400V AC	0-400	0-10V DC	4-20	5.98"	2.83"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	00000000
5	380-480V AC	7.6	400V AC	0-400	0-10V DC	4-20	8.66"	4.29"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	00000000
7 1/2	380-480V AC	12	400V AC	0-400	0-10V DC	4-20	8.66"	4.29"	Reversing	35	UL Listed C-UL Listed CE Marked	00000000	00000000

Three-Phase AC Motor Speed Controls

Vary the speed of three-phase AC motors. Mount these controls inside a machine or control cabinet. They’re often used in packaging machines, conveyors, and vacuum equipment. Operate controls manually or remotely with an electrical signal.

Input adapters (sold separately) allow controls to accept a range of input voltages and current. Mount to the bottom of the control.

For technical drawings and 3-D models, click on a part number.

		Output
Horsepower, hp	Input Voltage	Voltage	Frequency, Hz	Ht.	Wd.	Reversing Capability	Features	Specifications Met		Each
Single-Phase Input
1/2	115V AC/230V AC	230V AC	0-120	3"	4.3"	Reversing	Maximum Speed Setting, Run and Jog Modes, Torque Boost	UL Listed, C-UL Listed	0000000	0000000
1	115V AC/230V AC	230V AC	0-120	4.4"	6.9"	Reversing	Maximum Speed Setting, Run and Jog Modes, Torque Boost	UL Listed, C-UL Listed	0000000	000000

Input Adapter

Input Signal
Voltage	Current, mA		Each
0V DC-5V DC/0V DC-10V DC	4-20	0000000	0000000

Enclosed AC to DC Motor Speed Controls

Housed in a durable steel enclosure, these controls convert AC input voltage into DC output voltage and control the speed of permanent-magnet DC motors.

A heat sink (sold separately) is required with outputs greater than 5 amps.

For technical drawings and 3-D models, click on a part number.

Single Phase
Horsepower (Input Voltage/Output Voltage)	Current, A	Ht.	Wd.	Reversing Capability	Wire Connection Type	Environment	Environmental Rating	Specifications Met		Each
1/8-1 (115V AC/0-90V DC) 1/4-2 (230V AC/0-180V DC)	10	8"	6"	Nonreversing	Screw Terminals	Indoor Only	NEMA 1	UL Listed, C-UL Listed	0000000	0000000

Heat Sink

0000000

Each

0000000

Reversing Enclosed AC to DC Motor Speed Controls

Use these controls with motors that run forward and backward, such as motors for conveyor belts. They convert AC input voltage into DC output voltage and control the speed of permanent-magnet DC motors. Housed in a durable steel enclosure.

A heat sink (sold separately) is required with outputs greater than 5 amps.

For technical drawings and 3-D models, click on a part number.

Single Phase
Horsepower (Input Voltage/Output Voltage)	Current, A	Ht.	Wd.	Reversing Capability	Wire Connection Type	Environment	Environmental Rating	Specifications Met		Each
1/8-1 (115V AC/0-90V DC) 1/4-2 (230V AC/0-180V DC)	10	8"	6"	Reversing	Screw Terminals	Indoor Only	NEMA 1	UL Listed, C-UL Listed	0000000	0000000

Heat Sink

0000000

Each

0000000

Washdown Enclosed AC to DC Motor Speed Controls

A NEMA 4X rated enclosure protects these controls from corrosion and washdowns. They convert AC input voltage into DC output voltage and control the speed of permanent-magnet DC motors.

For technical drawings and 3-D models, click on a part number.

Single Phase
Horsepower (Input Voltage/Output Voltage)	Current, A	Ht.	Wd.	Reversing Capability	Wire Connection Type	Environmental Rating	Specifications Met		Each
1/8-1 (115V AC/0-90V DC) 1/4-2 (230V AC/0-180V DC)	10	7.5"	5.63"	Nonreversing	Screw Terminals	NEMA 4X	UL Listed, C-UL Listed	0000000	0000000

Reversing Washdown Enclosed AC to DC Motor Speed Controls

Use these controls with motors that run forward and backward, such as motors for conveyor belts. They have a NEMA 4X rated enclosure to withstand corrosion and washdowns. Use them to convert AC input voltage into DC output voltage and control the speed of permanent-magnet DC motors.

For technical drawings and 3-D models, click on a part number.

Single Phase
Horsepower (Input Voltage/Output Voltage)	Current, A	Ht.	Wd.	Reversing Capability	Wire Connection Type	Environmental Rating	Specifications Met		Each
1/8-1 (115V AC/0-90V DC) 1/4-2 (230V AC/0-180V DC)	10	7.5"	5.63"	Reversing	Screw Terminals	NEMA 4X	UL Listed, C-UL Listed	0000000	0000000

AC to DC Motor Speed Controls

Convert AC input voltage into DC output voltage and control the speed of permanent-magnet DC motors.

A heat sink (sold separately) is required with outputs greater than 5 amps.

For technical drawings and 3-D models, click on a part number.

Speed Control									Heat Sink
Horsepower (Input Voltage/Output Voltage)	Current, A	Ht.	Wd.	Reversing Capability	Wire Connection Type	Specifications Met		Each		Each
Single Phase
1/8-1 (115V AC/0-90V DC) 1/4-2 (230V AC/0-180V DC)	10	3.6"	4.3"	Nonreversing	Screw Terminals	UL Listed, C-UL Listed	0000000	0000000	0000000	000000

Low-Voltage DC Motor Speed Controls

Control the speed of low-voltage permanent-magnet DC motors. These controls accept DC input voltage and supply a variable DC output voltage. Set a minimum and maximum speed and adjust the current limit on these controls. Operate controls manually or remotely with an electrical signal.

For technical drawings and 3-D models, click on a part number.

Horsepower (Input Voltage/Output Voltage)	Current, A	Ht.	Wd.	Reversing Capability	Wire Connection Type	Features	Specifications Met		Each
1/6 (12V DC/0-12V DC) 1/6-1/3 (24V DC/0-24V DC)	16	6.9"	4.4"	Nonreversing	Screw Terminals	Overload Protection	C-UL Listed	0000000	0000000
3/4 (12V DC/0-12V DC) 3/4-1 (24V DC/0-24V DC)	60	7.8"	6.9"	Nonreversing	Screw Terminals	Overload Protection	C-UL Listed	0000000	000000

Speed Reducers for Position- and Speed-Control Motors

Pair these speed reducers with stepper and servo motors in position- and speed-control applications. Helical gears provide exact positioning and smoother travel than our other speed reducers. Attach to a motor to transmit motion parallel to the motor shaft while reducing speed and increasing torque. They meet IP65 for protection from washdowns.

Radial loads are loads that are perpendicular to the shaft. They’re commonly caused by components attached to shaft, such as pulleys and sprockets.

For technical drawings and 3-D models, click on a part number.

	Max. Output		Max. Input			Output Shaft		Overall
Speed Ratio	Torque	Speed, rpm	Speed, rpm	hp	For Input Shaft Dia.	Dia.	Lg.	Lg.	Wd.	Ht.	Radial Load Capacity, lbs.	Environmental Rating		Each
For NEMA 23 Motor
3:1	240 in.-lbs. @ 1,750 rpm	2,000	6,000	2.89	1/4"	0.38"	1"	4 1/2"	2 1/2"	2 1/2"	348	IP65	00000000	000000000
5:1	345 in.-lbs. @ 1,750 rpm	1,200	6,000	3.24	1/4"	0.38"	1"	4 1/2"	2 1/2"	2 1/2"	348	IP65	00000000	00000000
10:1	265 in.-lbs. @ 1,750 rpm	600	6,000	1.45	1/4"	0.38"	1"	4 1/2"	2 1/2"	2 1/2"	348	IP65	00000000	00000000
20:1	345 in.-lbs. @ 1,750 rpm	300	6,000	1.08	1/4"	0.38"	1"	5 3/4"	2 1/2"	2 1/2"	348	IP65	00000000	00000000
50:1	345 in.-lbs. @ 1,750 rpm	120	6,000	0.46	1/4"	0.38"	1"	5 3/4"	2 1/2"	2 1/2"	348	IP65	00000000	00000000
For NEMA 34 Motor
3:1	743 in.-lbs. @ 1,750 rpm	1,833	5,500	6.75	1/2"	1/2"	1.25"	5 1/4"	3 1/2"	3 1/2"	630	IP65	00000000	00000000
5:1	867 in.-lbs. @ 1,750 rpm	1,100	5,500	5.73	1/2"	1/2"	1.25"	5 1/4"	3 1/2"	3 1/2"	630	IP65	00000000	00000000
10:1	797 in.-lbs. @ 1,750 rpm	550	5,500	3.04	1/2"	1/2"	1.25"	5 1/4"	3 1/2"	3 1/2"	630	IP65	00000000	00000000
20:1	867 in.-lbs. @ 1,750 rpm	275	5,500	1.97	1/2"	1/2"	1.25"	7"	3 1/2"	3 1/2"	630	IP65	00000000	00000000
50:1	867 in.-lbs. @ 1,750 rpm	110	5,500	0.87	1/2"	1/2"	1.25"	7"	3 1/2"	3 1/2"	630	IP65	00000000	00000000