This product can be severed as main switch, automotive relay and isolator. Put this relay between as an isolator or in the main . 

Features:
Red binding post: ensuring heavy current can be transited safely. 
High current automotive relay and isolator.
500A heavy current relay: for construction and machinery system.
: ensuring the maximum electric current can be transferred.
Easy and effortless to use: simple installation.

Specifications:
load: 500A
form: 1A
Rated :
Max switching voltage: 14V
Mechanical : 10,000,000
Load material: AgSnO
Max switching current: 500A
Pin number: 4 pin
type: SPST
:-30℃to+80℃
Humidity: 40-85%
Item size: 8.5 * 5.5 * 7.7cm / 3.3 * 2.1 * 3in (L * W * H)
Item weight: 239g / 8.4oz
Package size: 9 * 8 * 6cm / 3.5 * 3.1 * 2.3in (L * W * H)
Package weight: 252g / 8.8oz

Package list:
1 * 4 pin high current relay and isolator