Power Transfer Switches
What are power transfer switches?
Power transfer switches are specialized devices engineered for marine applications. Their primary function is to transfer electrical power input between a vessel’s onboard generator and a shore power connection at the dock. This allows boat owners to conserve generator usage for times when they are away from shore, reducing unnecessary wear and extending the generator’s lifespan. Built for the harshest marine environments, these switches are constructed from rugged, non-corrosive nylon and melamine materials to ensure long-term reliability and durability.
"Their primary function is to transfer power input between an onboard generator and a shore power connection."
What is the difference between these switches?
The key differences between power transfer switches lie in their configuration and ratings. Each of the power transfer switches that we offer is vastly different from any of the others for a few specific reasons. For starters, the number of poles can vary. This means that you can get the switch you need based on the number of circuits you need to connect. Additionally, you can select the amperages available as well. Different power requirements may call for different amperages, and as such, we make sure to carry a wide range of amperages to ensure that you can get exactly what you need. We offer two main styles of power transferring switches.
Ship Shore PTSThe ship shore power transfer switch is your basic power transfer switch. Consisting of three positions; Shore / Off / Generator, this switch allows you to easily change between shore power or generator power. Ship shore switches are available in 2, 3, or 4 pole options and a whole range of amperages. The different amperages are available to meet the specific needs of varying vessels. Amperages include 10-amp, 15-amp, 20-amp, 25-amp, 35-amp, 50-amp, 65-amp, 100-amp, and 150-amp. With all the possible combinations, you are sure to find exactly what you are looking for.
Multi-Step PTSThe multi-step power transfer switch is designed to allow you to combine multiple shore power sources in order to power your vessel. The three positions; Shore 1 / Shore 1 & 2 / Generator, give you more options than you’ll get with the ship shore power transfer switches. In this way, you can still draw power from one source if needed however, you’ll have the option to draw from two sources when possible. One factor that separates all power transfer switches from other styles is the level of safety that these switches have built-in.
What safety features do these switches offer?
All power transfer switches have been designed with safety in mind, and as such, are made with a non-conductive switch body and handle. This prevents accidental shocks and shorts. The multistep power transfer switch also carries “break-before-make” technology, meaning that a circuit is disconnected before another is connected. This can help to prevent the momentary connection between the old signal path and the new signal path. So not only are power transfer switches safe for human operation, but some of them also offer a safer connection and disconnection method, protecting your electrical system over time. Whereas some switches are built to get a job done and that is it, power transfer switches are built with safety in mind. The best part is that this is only one of the advantages that these switches offer.
Non-Conductive Body
Break-before-make
Rugged Durability
How are power transfer switches advantageous?
Power transfer switches are advantageous in that they allow you to extend the life of your generator by not relying solely on the generator’s power. To only use your generator, especially when docked, wears down its internal parts faster and means you will have to replace it sooner. Power transfer switches alleviate this issue by allowing you to draw power from shore rather than the generator. This makes them both a practical and cost-effective investment for vessel owners who want to optimize performance and reliability.
Where are power transfer switches used?
Power transfer switches are installed on vessels that require the ability to alternate between shore power and generator power. They provide a distinct advantage over other switch types by offering seamless flexibility in power management. Installation is straightforward, typically requiring only the switch itself and, in some cases, the face plate. These switches are equally well-suited for new vessel builds as well as replacement applications.
Why should I use the cover plate?
The cover plate is for use with the EPTS-MS-65A multi-step power transfer switch. This cover plate identifies the position of the switch so that you can easily select the exact position that you need. With three positions, Shore 1 / Shore 1 & 2 / Generator, you will need to be able to quickly switch to the position you need. This is why using a cover plate is essential with the EPTS-MS-65A. While most power transfer switches do not require a cover plate, it is essential for this particular model.
Why choose Pacer?
With over 40 years of experience in the marine industry, Pacer has built a reputation for excellence and dependability. Every product we offer undergoes rigorous testing to meet the highest standards of performance and durability. When you choose Pacer, you are choosing quality, reliability, and the confidence that comes from working with a trusted industry leader.
*This page was updated on 8/26/2025*