12 Way 4-Relay Pre-Wired Fuse Box
Product Overview
The 12 Way 4-Relay Pre-Wired Fuse Box is a flexible automotive power distribution and circuit protection solution designed for vehicles and equipment with multiple auxiliary DC electrical accessories.
It integrates 12 ATC/ATO blade fuse positions and 4 automotive relay positions into one enclosure, providing centralized fuse protection and relay-controlled switching while helping keep complex wiring systems clean and organized.
The pre-wired harness reduces terminal crimping, relay socket assembly, and repetitive manual wiring, helping installers save assembly time and create a cleaner, more professional electrical layout.
Four circuits can be configured with relay-controlled switching, while the remaining fuse positions can be used for additional protected power circuits according to the customer's wiring design.
Relay configurations are available for 12V and 24V systems, with relay current ratings from approximately 30A to 60A, depending on relay model, wiring specification, load characteristics, and project requirements.
FUZTRAX can supply this product as a complete pre-wired assembly or provide housing, terminals, relays, fuses, and related components separately according to customer requirements.
Key Features
12 Fuse Positions + 4 Relay Positions
The integrated design combines twelve ATC/ATO blade fuse positions and four automotive relay positions in one enclosure.
The twelve fuse positions provide protection for multiple electrical circuits, while four relay positions allow selected accessories to be independently switched through relays.
This configuration is suitable for electrical systems that require many protected circuits but only a limited number of relay-controlled outputs.
Pre-Wired for Faster Installation
The pre-installed wiring harness helps reduce repetitive terminal crimping, relay socket wiring, and manual assembly.
Color-coded wiring can make circuit identification easier and help reduce wiring errors during installation.
For OEM and ODM projects, wiring specifications can be customized according to customer requirements, including:
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Wire gauge
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Wire length
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Wire color
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Terminal configuration
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Relay wiring layout
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Fuse configuration
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Power input arrangement
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Circuit grouping
4 Independent Relay-Controlled Circuits
Four relay positions provide independent switching control for selected electrical accessories.
Typical relay-controlled applications include:
Relay-controlled circuits can be configured according to the customer's actual electrical requirements.
Additional Fuse-Protected Circuits
Because the unit includes twelve fuse positions and four relay positions, the remaining fuse positions can be used for circuits that require fuse protection without relay switching.
These circuits may be used for:
This configuration provides greater flexibility when designing a complete vehicle electrical system.
12V / 24V Relay Options
Relay configurations are available for common automotive and equipment electrical systems.
Available voltage options include:
Available relay current ratings may include:
Relay models and contact configurations can be selected according to customer requirements.
Final relay selection should be based on:
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System voltage
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Continuous operating current
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Starting or inrush current
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Wire gauge
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Fuse rating
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Terminal capacity
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Connector capacity
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Installation environment
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Electrical load characteristics
ATC / ATO Blade Fuse Compatible
The fuse block is compatible with commonly used ATC/ATO automotive blade fuses.
Different fuse ratings can be selected for individual circuits according to the actual operating current of the connected equipment.
The standardized blade fuse format makes inspection, replacement, and maintenance convenient for automotive aftermarket and custom electrical applications.
Centralized Power Distribution
Instead of installing multiple individual fuse holders, relays, and scattered wiring throughout the vehicle, the 12 Way 4-Relay Fuse Box centralizes major circuit protection and switching components in one enclosure.
This helps simplify wiring management, reduce installation clutter, and create a cleaner electrical system.
The 12-fuse and 4-relay layout is particularly useful for electrical systems where only selected accessories require relay switching while other circuits only require fuse protection.
Protective Top Cover
The fitted top cover helps protect the relays, fuses, and electrical terminals from dust, dirt, debris, and accidental contact.
This product is not waterproof.
It should be installed in a dry or protected location.
Do not expose the unit directly to rain, continuous water spray, high-pressure washing, or immersion.
Multiple Supply Options
FUZTRAX can supply this product in different configurations according to customer requirements.
Complete Pre-Wired Assembly
Includes housing, terminals, relays, fuses, and pre-installed wiring.
Suitable for customers who require a ready-to-install electrical assembly.
Unwired Fuse Relay Box
The product can also be supplied without pre-installed wiring.
This option is suitable for:
Customers can create their own wiring configuration according to specific project requirements.
Housing + Terminal Kit
Housing and terminals can be supplied separately for customers who prefer local assembly or independent wiring production.
Relay Supply
12V and 24V automotive relays can be supplied according to customer requirements.
Available relay current ratings may range from approximately 30A to 60A depending on the selected relay model.
Individual Components
Housing, terminals, relays, fuses, and related electrical components can also be ordered separately according to customer requirements.
Applications
The 12 Way 4-Relay Pre-Wired Fuse Box is suitable for a wide range of automotive and auxiliary electrical applications, including:
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Off-road vehicles
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Pickup trucks
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SUVs
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RVs
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Utility vehicles
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Special-purpose vehicles
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Custom vehicles
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LED lighting systems
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Fog lights
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Driving lights
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Work lights
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Air horns
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Cooling fans
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Fuel pumps
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Auxiliary pumps
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Audio accessories
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Control modules
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Auxiliary power circuits
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Automotive aftermarket wiring
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OEM wiring harness assemblies
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Custom power distribution systems
Product Specifications
Product Name:
12 Way 4-Relay Pre-Wired Fuse Box
Fuse Positions:
12
Relay Positions:
4
Fuse Type:
ATC / ATO Blade Fuse
Wiring Type:
Pre-Wired or Unwired
Relay Voltage Options:
12V / 24V
Relay Current Options:
Approximately 30A–60A
Relay Model:
Customizable
Housing Protection:
Dust and debris protection
Waterproof:
No
Fuse Rating:
Customizable according to circuit requirements
Wire Gauge:
Customizable
Wire Length:
Customizable
Wire Color:
Customizable
Terminal Configuration:
Customizable
Connector Type:
Customizable
Wiring Configuration:
Customizable
Supply Options:
Complete pre-wired assembly / Unwired box / Housing + terminals / Relays / Fuses / Individual components
Why Choose the 12 Way 4-Relay Configuration?
The 12 Way 4-Relay configuration is designed for electrical systems that require a larger number of protected circuits but only several relay-controlled outputs.
The twelve fuse positions provide ample capacity for auxiliary electrical accessories, while four relay positions can be assigned to circuits that require independent switching or higher-current control.
The remaining fuse positions can be used for direct protected power circuits, low-current accessories, control modules, or other electrical loads according to the customer's wiring design.
Compared with installing separate fuse holders and relays throughout the vehicle, the integrated enclosure helps reduce wiring complexity and creates a cleaner, more organized electrical system.
This configuration is particularly suitable for:
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Off-road vehicle upgrades
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Pickup truck electrical systems
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SUV modifications
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RV electrical projects
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Utility vehicles
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Special-purpose vehicles
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Custom vehicle builds
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OEM wiring harness assemblies
OEM & ODM Customization
FUZTRAX provides OEM and ODM manufacturing services for automotive fuse boxes, relay boxes, wiring harnesses, terminals, and related electrical assemblies.
Customization options include:
Customers can order a complete pre-wired product or purchase the housing, terminals, relays, fuses, and other related components separately according to their own production and assembly requirements.
Important Electrical Notice
The current rating printed on a relay represents the relay contact specification and does not automatically represent the safe continuous current capacity of the complete fuse relay box or wiring harness.
Actual allowable circuit current depends on multiple factors, including:
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Wire cross-sectional area
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Fuse rating
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Relay contact rating
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Terminal capacity
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Connector capacity
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Continuous operating current
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Starting or inrush current
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Ambient temperature
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Installation method
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Electrical load characteristics
Always select the correct relay, fuse, wire gauge, terminals, and connectors according to the actual electrical requirements of the connected equipment.
For high-current, motor-driven, or specialized electrical applications, confirm the complete electrical specifications before ordering.
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