ATO/ATC Fuse Holder & ISO Relay Connector

Weatherproof ATO/ATC Fuse Holder and ISO Relay Connector
Chief Power Distribution

Weatherproof ATO/ATC Fuse Holder & ISO Relay Connector

Chief’s weatherproof ATO/ATC fuse holder and Mini ISO relay connector are designed for applications where sealed circuit protection and relay connectivity are required. Both use push-to-seat terminals, single wire seals, and TE MCP 6.3 terminal systems for reliable assembly and serviceability.

Chief Weatherproof Connector Series

This product line includes Chief-designed sealed components for rugged power distribution and relay applications, including a single ATO/ATC fuse holder and a weatherproof Mini ISO relay connector.

ATO/ATC Fuse Holder

ATO/ATC Fuse Holder

Sealed single-fuse holder designed to house one ATO/ATC fuse in rugged OEM applications.

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ATO/ATC Fuse Holder - C1258 ATO/ATC Fuse Holder with 12 AWG Wire Leads - C2039 ATO/ATC Fuse Holder Kit - C2506
Weatherproof ISO Mini Relay Connector

ISO Mini Relay Connector

Weatherproof relay connector designed to mate with a single weatherproof ISO Mini relay.

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Waterproof ISO Mini Relay Connector - C1256 Weatherproof ISO Mini Relay Connector (With Vent) - C1257-4 ISO Relay Connector with Wire Leads - C2500 ISO Relay Connector with Wire Leads & Vent - C2501 Weatherproof ISO Relay Connector (No Vent) Kit - C2504 Weatherproof ISO Relay Connector (With Vent) Kit - C2505
Fuse Holder and Relay Connector Accessories

Accessories

Optional TPAs, boots, tethers, covers, seals, terminals, and wire leads for complete connector assemblies.

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APTIV Cap, Fuse Holder Cover - 12033731 Hongfa 12V Relay, Relay Connector Cover, Sealed - HFV15/12-Z5ST-R(257) TE MCP 6.3 Terminals Seals, Plugs & Accessories Wire Leads

Technical Overview

Product Features

  • Push-to-seat terminal design
  • Optional terminal position assurance
  • Silicone radial sealing system
  • High-impact glass reinforced polyamide construction
  • Designed for OEM environments

Electrical Specifications

  • Utilizes TE MCP 6.3 terminal system
  • Up to 40A per terminal at 20°C ambient
  • 24 AWG to 10 AWG wire range
  • Single wire seal terminal sealing
  • Supports ATO/ATC fuse or ISO Mini relay applications

Performance Specifications

  • -40°C to +120°C ambient temperature
  • ATO fuse holder: IP67 ingress protection
  • Relay connector: IP66 ingress protection
  • UV stable and resistant to most underhood chemicals
  • Validated for vibration, shock, drop, and rain cycle testing

Product Dimensions

Fuse holder and relay connector dimensions
Product Width Height Depth
ATO/ATC Fuse Holder (No Cover) 31.0 mm 30.0 mm 20.0 mm
ISO Mini Relay Connector 36.0 mm 33.0 mm 44.0 mm

See It in Action

Fuse Holder and Relay Connector Video ▶

Fuse Holder & Relay Connector Overview

Watch how Chief’s weatherproof fuse holder and relay connector support rugged OEM circuit protection and relay applications.

Fuse Holder and Relay Connector Components

Engineered for Serviceability

Push-to-seat terminals, silicone wire seals, optional TPAs, and field-serviceable components simplify assembly and maintenance.

Resources

Engineering documentation for Chief’s weatherproof ATO/ATC fuse holder and ISO Mini relay connector line.

Chief-Designed Power Distribution Product Catalog
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ATO Fuseholder Application Specification
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Weatherproof Relay Connector Application Specification
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Fuse Holder & Relay Connector Sell Sheet
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Frequently Asked Questions

What is the ATO/ATC fuse holder?

Chief’s ATO/ATC fuse holder is a sealed single-fuse holder designed to house one ATO/ATC fuse in rugged OEM applications.

What is the weatherproof relay connector?

Chief’s weatherproof relay connector is designed to mate with a single weatherproof ISO Mini relay and support sealed relay connections in rugged vehicle applications.

Are these products part of the BRIC family?

No. These are Chief-designed weatherproof fuse holder and relay connector products, but they are not part of the BRIC power distribution module family.

What terminal system do they use?

Both products use the TE MCP 6.3 terminal system with single wire seals.

What wire range is supported?

The application specifications list a wire range of 24 AWG to 10 AWG, or 0.2 mm² to 6.0 mm².

What is the maximum current rating?

The products support up to 40A per terminal at 20°C ambient, depending on application conditions and proper wire gauge selection.

What ingress protection ratings are supported?

The ATO/ATC fuse holder is rated IP67, while the weatherproof relay connector is rated IP66 according to their application specifications.

What applications are these products used for?

These products are designed for construction, agriculture, powersports, heavy-duty transportation, marine, RV, power generation, and specialty vehicle applications.

Ready to spec a fuse holder or relay connector into your next program?

Contact Chief’s engineering team to review your sealed circuit protection and relay connector requirements.