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 Master Battery Disconnect Switch with Face Plate

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

Product ID: 315972177

Details

Brand
Fastronix
Connector type
auxiliary
Contact type
Normally Open
Current rating
300 Amps
Item dimensions L x W x H
12.7 x 6.7 x
Material
Copper

⚡300A continuous current

🔥2000A intermittent surge

🛡️IP67 sealed for harsh environments

₱11529

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Sold byAmazon PhilippinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up with confidence—switch to Fastronix and never settle for less!

PROFESSIONAL FINISH - Compatible with Fastronix 404-116 terminal covers for a sleek, clean installation that stands out.
DUAL MODE FLEXIBILITY - Switch between single or dual pole configurations for versatile power control.
UNMATCHED POWER HANDLING - Handles up to 300A continuous and 2000A surge—built for serious current demands.
AUXILIARY ACCESSORY READY - Includes smaller 20A studs for indicator lights or small devices—independent yet integrated.
BUILT TO BRAVE THE ELEMENTS - IP67-rated sealed internals ensure flawless operation in dust, water, and extreme temps (-40°F to 185°F).

The Fastronix 300A Severe Duty Master Battery Disconnect Switch features robust 1/2" copper studs rated for 300A continuous and 2000A intermittent current at 24V. Its IP67 sealed design guarantees reliable performance in extreme environments, while flexible single or dual pole configurations and auxiliary studs support versatile, professional-grade installations.

Specifications

ASIN	B07L2JRHRQ
Actuator Type	Rotary
Best Sellers Rank	170,040 in Automotive ( See Top 100 in Automotive ) 388 in Car Battery Switches
Brand	Fastronix Solutions
Circuit Type	2-way
Colour	Black
Connectivity Protocol	Auxiliary
Connector Type	auxiliary
Contact Material	Copper
Contact Type	Normally Open
Controller Type	Push Button
Current Rating	300 Amps
Customer Reviews	4.7 4.7 out of 5 stars (326)
International Protection Rating	IP67
Item Dimensions	12.7 x 6.7 x 6.7 centimetres
Item Weight	0.01 Ounces
Manufacturer	Fastronix Solutions
Manufacturer Part Number	303-004
Material	Copper
Model Number	300A
Mounting Type	Face
Number of Items	1
Number of Positions	1
Operating Voltage	24 Volts
Operation Mode	ON-OFF
Specification Met	ip67
Switch Type	Rotary
Terminal	Copper Stud
UPC	635414975837
Unit Count	1.0 count
Upper Temperature Rating	185 Degrees Fahrenheit
Wattage	3600 watts

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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₱11529

Duties & taxes included

In stock

Sold byAmazon PhilippinesDelivered 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 Philippines.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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