Durite Rotary Marine Battery Isolators – 300A & 550A

Durite rotary marine battery isolators provide a safe, reliable way to disconnect your DC battery bank for maintenance, storage, or emergency shutdown on boats, off‑grid systems, and automotive applications. Designed for long service life and high continuous current at up to 48V DC, they help protect your installation, comply with safety best practice, and give a clear, visible isolation point for both homeowners and trade professionals.

Product Overview

This parent product covers Durite’s 300A and 550A rotary battery isolators, both marine‑grade units with robust terminals, clear ON/OFF actuation, and compact housings suitable for engine bays, lockers, and inverter/battery compartments. The 300A version is ideal for medium‑size DC systems, while the 550A variant supports larger inverters and higher peak loads, each rated for 1‑hour continuous operation and short‑term cranking or surge currents.

Key Features

• High current ratings: 300A or 550A continuous (1hr) at up to 48V DC for dependable isolation on demanding DC systems.
  
• Short‑term surge capability: 300A model rated up to 1000A for 5 seconds; 550A model up to 2500A for 5 seconds to handle engine cranking and start‑up loads.
  
• Marine‑grade construction: Durable housings and quality terminals engineered for harsh marine and automotive environments.
  
• Clear, secure control: 300A version with removable control knob in the OFF position; 550A version with fixed control knob and padlock hole for lock‑off safety.
  
• Compact footprint: 300A unit approx. 69 × 77 × 69 mm for easy installation in tight spaces.
  
• Heavy‑duty terminals: 300A model with M10 studs; 550A model with larger M12 studs for secure cable connections.
  
• Up to 48V systems: Suitable for 12V, 24V and 48V DC battery banks across marine, vehicle and off‑grid applications.
  
• Safety and compliance: CE‑approved marine battery isolator range supporting safer system design and service procedures.
  

Why Buy

• Protect your investment: Proper battery isolation reduces risk of accidental discharge, damage to inverters, and electrical faults during maintenance.
  
• Professional‑grade reliability: Trusted Durite components are widely used by marine engineers, auto electricians, and solar installers for heavy‑duty DC isolation.
  
• Simple, fast installation: Compact dimensions, straight‑forward stud connections and clear rotary operation help save time on both new builds and retrofits.
  
• Flexible system design: Two current ratings and different control options (removable knob or padlockable fixed knob) allow you to match the isolator to your load and safety requirements.
  
• Clear visual isolation: The prominent rotary knob provides an obvious on/off indication, helping prevent accidental energising of circuits during work.
  

Suitable For

• Marine installations: Isolation of starter and service banks on sailing yachts, motorboats, ribs and commercial vessels.
  
• Off‑grid and solar: DC isolation between battery banks and inverter/chargers in home and cabin systems up to 48V DC.
  
• Automotive and commercial vehicles: Battery master switching on vans, motorhomes, service vehicles and plant.
  
• Backup and industrial systems: Battery disconnects on UPS, pump controllers and other DC backup equipment.
  
• Homeowners & professionals: Suitable for competent DIY users working to good practice, as well as electricians, marine engineers and solar installers needing a robust, compliant isolator.
  

Available Variants (Child Products)

Technical Specifications

Note: MPN and EAN codes were not reliably available across sources; they are therefore not shown, ensuring a clean and accurate listing for your customers.