Rehlko APM 402 black controller installed in context, with a close-up view of its buttons and connected engine components.

Engineered to the highest standards.

Controller solutions for any power need, from simple to complex.

Decades of proven power expertise.

Trust Rehlko’s decades of experience in power generation. From basic controls to multi-generator paralleling, we engineer, design, and test genset controllers to deliver unmatched reliability and performance.

Zoomed-in view of a gray generator controller featuring a white Rehlko logo.
Rehlko APM 603 black controller featuring the Rehlko logo and printed configuration details.

  • Each controller seamlessly integrates with our automatic transfer switches and paralleling switchgear

  • Our controllers are rigorously tested and approved to meet NFPA, UL and CE standards

  • Rehlko controls deliver precise voltage regulation (.05%–0.25%)

  • Every controller includes serial Modbus and offers optional Ethernet connectivity

  • Our controllers feature advanced network communications for remote monitoring and adjustable parameters

  • Built-in alternator protection safeguards the alternator from thermal overload.

Contact one of our authorized distributors for more information.

We’ve got you covered.

Our global customer assistance network is available 24/7/365 to help you locate spare parts, navigate your warranty, and provide technical support. Contact us today.

Various mechanical parts neatly arranged together on a white background for display.
Find Your Distributor.

Find your distributor.

We’re always engineering towards a better, more efficient future! That’s why we’ve created a simple way to help you find your local distributor. Just let us know where you are. We'll do the rest.