Can you just hook the positive or negative battery cable to each stud and use it as a simple switch? Secondary terminals will be left unused

Yes. I use it as a switch to kill the battery circuit on my tractor. BTW. It's well built and sturdy.

The lugs are 1/2" the biggest cables avaiable are 5/16" & is this switch overkill for a average car?

The average car will typically use the Fastronix 303-001 Master Disconnect Switch which is rated to 180A continuous and 1000A intermittent, however the estimated current load will ultimately determine which disconnect switch you should use.

Is this offered in a 2 post insted of 4 post?

Not sure you need to research it more

How do you install on a 08 frieightliner d60 4 battery setup?

I put these disconnects on a 4 battery setup on a Peterbilt. Freightliner is no different. Because of the excessive current flowing during starting, I split the batteries and put two switches on, one for each set of two batteries. I had to make some special cables, but it all works very well.

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Fastronix 300A 1/2" Severe Duty Battery Disconnect Switch with Face Plate

Fastronix 300A 1/2" Severe Duty Battery Disconnect Switch with Face Plate

Product ID: 105332386

Details

Brand
Fastronix
Connector Type
Auxiliary
Contact Type
Normally Open
Current Rating
300 A
Item dimensions L x W x H
5 x 2.63 x
Material
Copper

⚡300A continuous current rating

🔩1/2" copper main studs

🛡️IP67 waterproof protection

15746 kr

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Description

🔋 Cut the power, not the style — Fastronix 300A keeps you in control!

ACCESSORY READY - Auxiliary studs rated at 20A let you add indicator lights or small accessories with ease.
PROFESSIONAL FINISH - Pair with Fastronix 404-116 terminal covers for a sleek, polished installation that stands out.
ROCK SOLID STABILITY - Index pin design locks the switch in place, preventing rotation and ensuring reliable operation.
POWERHOUSE PERFORMANCE - Handles a robust 300A continuous load and surges up to 2000A—built for serious power demands.
VERSATILE CONFIGURATION - Switch seamlessly between single or dual pole setups to fit your exact system needs.

The Fastronix 300A 1/2" Severe Duty Battery Disconnect Switch is engineered for high-performance electrical systems, featuring durable copper studs rated for 300A continuous and 2000A intermittent current. Its IP67 rating ensures waterproof reliability, while the rotary actuator and index pin prevent accidental rotation. Designed for both single and dual pole configurations, it supports auxiliary accessories and offers a professional installation finish with compatible terminal covers.

Specifications

ASIN	B07L2JRHRQ
Actuator Type	Rotary
Best Sellers Rank	#33,431 in Automotive ( See Top 100 in Automotive ) #76 in Automotive Replacement Battery Switches
Brand	Fastronix Solutions
Brand Name	Fastronix Solutions
Circuit Type	2-way
Color	Black
Connectivity Protocol	X-10
Connector Type	Auxiliary
Contact Material	Copper
Contact Type	Normally Open
Control Method	Touch
Current Rating	300 A
Customer Reviews	4.6 out of 5 stars 345 Reviews
International Protection Rating	IP67
Item Dimensions	5 x 2.63 x 2.63 inches
Item Weight	0.27 g
Manufacturer	Fastronix Solutions
Material Type	Copper
Model	300A
Mounting Type	Face
Number of Items	1
Number of Positions	1
Operating Voltage	12 volts
Operation Mode	ON-OFF
Part Number	303-004
Specification Met	iec
Switch Type	Rotary
Terminal	Pin
UPC	635414975837
Unit Count	1 Count
Upper Temperature Rating	185 °F
Wattage	3600 watts

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TrustScore 4.5 | 7,300+ reviews

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15746 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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2 months ago

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