Marathon Automatic Voltage Regulators
At General Power, we supply Marathon automatic voltage regulators that keep generator output steady as loads rise and fall. An AVR reads the voltage coming from the alternator and adjusts the field current to hold it at the set level. That steady output protects the motors, electronics, and controls connected to your generator. Marathon units are one part of our wider selection of voltage regulators for leading alternator makes.
Marathon AVR Models for Analog and Digital Control
Marathon regulators fall into two main groups. The analog group includes the SE350, a compact regulator for self excited generators that is set with simple onboard adjustments. The PM100A and PM300E are made for generators that power the regulator from a permanent magnet generator, which helps hold voltage during motor starting and other heavy loads.
The digital group includes the DVR2000E+ and the DVR2400. These microprocessor based regulators add programmable settings and built in protective functions for sites that need tighter control. If you are replacing the whole machine and not just the regulator, we also carry Marathon alternators in a wide range of power ratings.
Details to Confirm Before Ordering a Marathon Automatic Voltage Regulator
The right regulator depends on how your generator is built and how it is used. Gathering a few details makes the match quick and accurate. Most of this information is on the generator nameplate or on the label of the old regulator.
- Excitation type: Check whether your generator is self excited or uses a permanent magnet generator, since each type needs a different regulator.
- Sensing voltage and phase: Note the voltage the regulator senses and whether it reads one phase or all three.
- Frequency: Confirm whether the set runs at 50 Hz or 60 Hz so the underfrequency setting is correct.
- Model and serial numbers: Record the numbers from both the generator and the existing regulator.
- Parallel operation: Tell us if the unit shares load with other generators, because that may call for extra components.
With these details, our team can confirm the correct part and point out anything else the swap may need. We can also help when the regulator is part of a larger rebuild that includes a new generator end.
Signs a Voltage Regulator Needs Replacement
Regulators work in heat, vibration, and dust, and those conditions wear down electronic parts over time. A failing unit usually gives warning before it stops working. Knowing the common symptoms helps you order a replacement before an outage.
- Flickering lights: Voltage that swings up and down points to a regulator that can no longer hold a steady level.
- High or low voltage: Output that stays off target and does not respond to adjustment is a common sign of failure.
- No output: An engine that runs at full speed while the generator makes little or no voltage may have lost excitation.
- Slow recovery: Voltage that sags when a load is added and does not come back can mean the regulator is weak.
These symptoms can also come from worn diodes, loose wiring, or other faults inside the alternator. Our technical staff can help you narrow down the cause, and we stock replacement alternator parts and generator control panels if the problem lies elsewhere.
Fast Supply and Certified Support from General Power
General Power was founded in Miami, Florida in 1999 as an original equipment manufacturer, master distributor, and authorized dealer. We serve more than 10,000 customers in over 100 countries, and we hold an A+ rating from the BBB. Our large inventory supports same day quoting and same day shipping on stocked items.
Every one of our sales specialists and engineers is individually certified by the Electrical Generating Systems Association. Our bilingual staff supports industrial, commercial, rental, emergency, and export only buyers, and we stay available after the sale. As a one stop shop, we can also supply diesel generator sets and transfer switches along with your Marathon AVR.
