NewMar Rotary Switches
NewMar Rotary Switches: Precision AC Source Selection for Marine Applications
NewMar has spent more than 50 years engineering power solutions for demanding environments — and nowhere is that expertise more evident than in their rotary switches. Built specifically for vessels where safe, reliable AC power management is non-negotiable, NewMar's rotary switches represent the same mission-critical design philosophy the brand applies across its entire marine and industrial product range.
What Makes NewMar Rotary Switches Stand Out
NewMar's rotary switches are purpose-built as AC source selector switches — an essential component for any vessel equipped with an on-board AC generator and/or inverter. By isolating power source inputs, the switch eliminates the safety hazard or damage that can occur if two AC sources are applied to the same circuit simultaneously. This single function can prevent costly electrical damage and serious onboard safety incidents, making the rotary switch one of the most important pieces of hardware in a marine electrical system.
The engineering details behind NewMar's SS Series switches reflect their professional-grade pedigree. These switches are fitted with a compact escutcheon plate with engraved switch position nomenclature, carry cUL approval, are CE marked, and feature heavy-duty contacts and a positive step cam mechanism for low resistance contact closure. The positive step cam is particularly noteworthy — it ensures each switching position seats firmly and completely, minimizing arc-flash risk and contact resistance that can cause heat buildup over time.
The switches may be rear-mounted in a panel with thickness up to 1/4". This flexibility makes installation straightforward in both original equipment builds and retrofit projects, fitting neatly into standard marine electrical panels without requiring custom cutouts or hardware.
The SS Series: Configurations for Real-World Boating Scenarios
NewMar offers multiple SS Series configurations to match the specific power setup aboard a vessel. Part #SS-15 may be configured as a 63 amp, 4-pole switch, while Part #SS7.5INV is designed for vessels with an onboard generator and inverter. This range of configurations means whether a boat relies on shore power and a generator, or adds an inverter to the mix, there is a NewMar rotary switch engineered for that exact application — without overspecifying or underbuilding for the load.
NewMar's Heritage in Marine Electrical Systems
NewMar's story began in 1970 with an engineer who stocked parts to service boats at a Newport Beach marina, eventually designing and building his first product — a voltage converter for a radio company. That marine-first DNA has never left the brand. NewMar offers an extensive line of DC power products with an earned reputation of high reliability and quality, powering essential equipment in industries such as marine, telecommunications, network, land mobile, and automation. Their rotary switches carry the same standard of craftsmanship that professionals in these industries have come to depend on.
Decades later, NewMar retains the DNA of the original company, maintains a manufacturing plant in the USA, and has established a strong reputation as a trusted brand in every industry it serves.
For boaters, marine electricians, and commercial vessel operators who need to manage multiple AC power sources safely and confidently, NewMar's rotary switches deliver the certifications, build quality, and application-specific engineering the job demands. Browse the full selection of rotary switches or explore everything NewMar has to offer for your vessel's electrical system.