CE Compliant certified

CE Compliant

Generator Excitation Control Rheostats for Stable Power Output

Generator excitation control rheostats provide precise voltage regulation for stable power output in generator systems. These wirewound and conductive plastic rheostats combine high-wattage capability with motorized control, enabling automated excitation adjustment for consistent generator performance. Available in 25W to 100W ratings with AC or DC motor options, they feature slip clutch protection and long operational life for industrial power generation applications.

Motorized Rheostats
100 watt with 115 VAC motor
25 watt with 115 VAC motor
50 watt with 115 VAC motor
25 watt with DC motor
50 watt with DC motor
Single turn wirewound - 0.5 Watt - 10 ohm to 20K - 1 3/8″ Dia x 3.76″L Dual 4.25″L
10 turn wirewound - 5 Watt - 10 ohm to 100K - 2″ square x 8.5″ L
Single turn wirewound - 0.5 Watt - 10 ohm to 20K - 1.5″ x 5″ L
Single turn Conductive plastic - 1 Watt - 50 ohm to 20K Standard - 1 3/8″ Dia x 3.76″L 5.5″L
10 turn wirewound - 2 Watt - 1K/1K, 2K/2K, 5K/5K, 10K/10K, 2K/3K, 5K/10K - 1 1/4″Dia x 5 3/4″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 1.5″ x 6 3/4″ L
Single turn conductive plastic - 2 Watt - 500 ohm to 100K - 2″ square x 4 1/4″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 1 1/4″Dia x 4 3/4″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 1.5″ x 5 1/4″ L
10 turn wirewound - 2 Watt - 1K/1K, 2K/2K, 3K/3K, 5K/5K, 5K/10K, 10K/10K - 1.5″ x 6″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 1.5″ x 5″ L
10 turn wirewound - 2 Watt - 5K/5K/5K normal. Others available. - 1 1/4″Dia x 7″ L
Single turn wirewound - 0.5 Watt - 10 ohm to 20K - 2″ x 5.25″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - *
Single turn wirewound - 0.5 Watt - 1K/1K, 2K/2K, 3K/3K, 5K/5K, 5K/10K, 10K/10K - 1.5″ x 5.25″ L
10 turn wirewound - 5 Watt - 100 ohm to 100K Normal 1K - 2″ Square x 6 3/4″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 1 3/8″Dia x 4″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 1.5″ x 6 1/2″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 7/8″ Dia x 4 3/4″ L
AC Motorized Potentiometers
DC Motorized Potentiometer
Single turn conductive plastic - 1 Watt - 500 ohm to 20K Standard - 1.5″ x 4 3/4″ L
10 turn wirewound - 2 Watt - 100 ohm to 100K - 1 1/4″Dia x 6″ L
Single turn conductive plastic - 1 Watt - 500 ohm to 20K Standard - 1.5″ x 5″ L
Single turn Conductive plastic - 1 Watt - 500 ohm to 100K - 1 1/4″Dia X 5.4″L
3 turn hybrid - 1 Watt - 1K to 100K - 7/8″Dia x 4 3/4″ L
Single turn conductive plastic - 2 Watt - 1K to 100K - 2″ square x 4″ L

Our Range of Products
Motorized Rheostats

Motorized Rheostats

  • 25W, 50W, 100W wattage options
  • Slip clutch protection feature
  • AC/DC motor configurations
100 watt with 115 VAC motor

100 watt with 115 VAC motor

  • 100W industrial grade power
  • Smooth long-term operation
  • 3 year parts & labor warranty
25 watt with 115 VAC motor

25 watt with 115 VAC motor

  • 25W with 115 VAC motor
  • 1-15 RPM variable speeds
  • Made in USA - 3 year warranty
50 watt with 115 VAC motor

50 watt with 115 VAC motor

  • 50W high wattage capacity
  • CE compliant for global use
  • Repair & rebuilding service
25 watt with DC motor

25 watt with DC motor

  • 25W with DC motor option
  • Slip clutch end stop protection
  • Long-life reliable design
50 watt with DC motor

50 watt with DC motor

  • 50W with 12 VDC motor
  • 1-2 RPM precision control
  • Compact efficient package

Showing 1 to 6 of 33 results

Frequently Asked Questions

What is a rheostat used for in a generator?

A rheostat controls generator excitation by adjusting field current, regulating voltage output to maintain stable power generation under varying load conditions.

What is the main purpose of a rheostat?

What wattage rating do I need for generator excitation control?

Can motorized rheostats be manually adjusted if needed?

What's the difference between AC and DC motor rheostats?

How long do motorized rheostats typically last?

Are custom resistance values available for specialized generators?

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

Industries We Serve

Power Generation

Power Generation

Motorized rheostats provide precise excitation control for industrial generators, maintaining stable voltage output in power plants and backup generation systems.

Industrial Automation

Industrial Automation

Automated rheostat systems enable remote voltage regulation in manufacturing facilities, providing consistent power quality for sensitive production equipment.

Marine Applications

Marine Applications

Marine generator systems utilize motorized rheostats for reliable excitation control in shipboard power generation, ensuring stable operation in challenging environments.

Utilities & Infrastructure

Utilities & Infrastructure

Utility-scale applications employ motorized rheostats for generator voltage regulation in substations, ensuring grid stability and power quality compliance.

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

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Why Power Generation Engineers Choose On Line Controls, Inc.

44+ Years Manufacturing Excellence

Since 1980, we've been engineering precision control solutions with proven reliability. Our motorized rheostats deliver consistent performance across decades of continuous operation in demanding industrial environments.

Made in USA Quality Standards

All products manufactured at our Shrewsbury, MA facility with rigorous quality control. We back every unit with a comprehensive 3-year warranty and unlimited technical support for complete peace of mind.

Custom Configuration Expertise

Our engineering team provides tailored solutions for unique excitation control requirements. From resistance values to motor specifications, we configure rheostats to match your exact generator system needs.

Get Expert Guidance on Generator Excitation Control Solutions

Our technical team will help you select the right rheostat configuration for your generator system. Expect a detailed response within 24 hours with product recommendations and pricing.

Contact Us Today

For immediate assistance, feel free to give us a direct call at 978-562-5353. You can also send us a quick email at olc@onlinecontrols.com