Fastronix Solutions 300A Battery Disconnect Switch 1/2in Severe-Duty with Face Plate and Copper Studs

The Fastronix 300A 1/2" Severe Duty Battery Disconnect Switch is a heavy-duty on/off master battery switch engineered to isolate 12V battery systems safely and reliably in demanding environments.

Designed for industrial vehicles, marine craft, RVs and heavy equipment, this disconnect switch gives you a clear, durable method to cut power when performing maintenance, preventing battery drain, or securing equipment. Built with robust copper main studs and a keyed index pin, the unit balances continuous high-current handling with installation stability and accessory flexibility.

How much current can this switch handle and for how long?

This switch is rated for continuous heavy use and momentary higher loads. It supports up to 300A continuous at 12VDC and can withstand intermittent surges up to 2000A, making it suitable for most starter and high-draw accessory circuits.

• 1/2" copper main studs rated 300A continuous at 12VDC
• Intermittent surge capability: 2000A
• Solid copper conductors for minimal voltage drop
• Durable contacts for frequent switching in harsh conditions

Can I use this switch for multiple circuits or accessories?

The Fastronix switch can be configured as a single pole or dual pole device, giving you flexibility to isolate one battery bank or two circuits at once. It also includes smaller auxiliary studs for low-current accessories like indicator lamps or remote switches.

• Selectable single-pole or dual-pole wiring
• Auxiliary studs rated 20A@12VDC for indicators or small loads
• Mounting face plate compatible with standard panel cutouts
• Works with Fastronix 404-116 terminal covers for neat installations

How does installation and durability hold up in tough environments?

This switch is built for severe-duty service with features that resist rotation and maintain electrical integrity under vibration. An index pin secures the unit after mounting, while copper studs and a rugged face plate provide reliable mechanical and electrical performance.

• Index pin prevents post-installation rotation and loosening
• 1/2" copper studs for strong mechanical clamping and conductivity
• Optional terminal covers enhance safety and appearance
• Face plate provides tidy panel mounting and weather resistance

What accessories and safety options are available?

For a finished, safe installation pair the switch with Fastronix terminal covers and standard mounting hardware. The auxiliary studs allow safe connection of indicator lights or small remote controls without loading the main studs.

• Use Fastronix 404-116 terminal covers for protection and tidy wiring
• Aux studs permit indicator lights or remote on/off circuits (20A max)
• Face plate designed for secure panel mounting and visual status
• Compatible with common battery cable lug sizes on 1/2" studs

Who is this for: Installers, fleet managers, boat owners, RV technicians and DIYers who need a compact, high-current battery isolation switch that stands up to vibration, high loads and repeated use. If you need reliable battery isolation for starting, maintenance, security, or to prevent parasitic drain while retaining the option to power small indicators or accessories, the Fastronix 300A severe duty disconnect is built to meet those demands without complex wiring changes.