# 7205 Dunbier H3038 Mackay Breakaway Switch | Marine Trailer Part

🔧 Product Description

  

Dunbier Trailer Breakaway Switch - Part Number: 7205

  

A genuine-style service component for Hydrastar, iQ7 and compatible powered brake systems when wired accordingly. The supplied component is pull-pin emergency switch; Mackay H3038 and is used to activates the trailer brakes if the trailer separates from the tow vehicle.

  

⚙️ Key Features

  

• Application: Hydrastar, iQ7 and compatible powered brake systems when wired accordingly

• Component: pull-pin emergency switch; Mackay H3038

• Designed for electric-over-hydraulic trailer braking

• Direct service replacement when the actuator model matches

• Marine-trailer maintenance component

  

📏 Specifications

  

• Type: pull-pin emergency switch; Mackay H3038

• System: Hydrastar electric-over-hydraulic braking

• Compatibility must be confirmed from actuator generation and service reference

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 7205

• Mackay: H3038

• Use with a charged compliant breakaway battery

  

🚤 Trailer Compatibility & Application

  

• Suitable for Hydrastar, iQ7 and compatible powered brake systems when wired accordingly

• Hydraulic and electrical work must match the actuator service manual

• Not interchangeable across actuator generations without part-number confirmation

  

🔌 Function

  

Activates the trailer brakes if the trailer separates from the tow vehicle.

  

Common signs of wear or failure:

  

• Fluid or moisture enters around the component

• Component is cracked, corroded or electrically open

• Brake warning or breakaway test fails

• Actuator operation becomes intermittent

• Connector, pin or fitting shows heat or corrosion damage

  

🛠️ Installation & Safety

  

• Disconnect trailer power and relieve hydraulic pressure before service

• Use only clean compatible brake fluid and fittings

• Follow Hydrastar bleeding and wiring procedures

• Test normal braking and breakaway operation after repair

• Brake-system repairs should be completed by a competent technician

  

📦 Condition

  

• Genuine Dunbier Marine Products part

• Brand new

• Supplied as one trailer breakaway switch

• Supplied in original or equivalent packaging

## Details

- **Price:** 47.0 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 47.00 AUD | In stock |

## Images

- 7205 Dunbier H3038 Mackay Breakaway Switch | Marine Trailer Part
- 7205 Dunbier H3038 Mackay Breakaway Switch | Marine Trailer Part
- 7205 Dunbier H3038 Mackay Breakaway Switch | Marine Trailer Part
- 7205 Dunbier H3038 Mackay Breakaway Switch | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/7205-dunbier-breakaway-switch-mackay-h3038)
> Updated: 2026-08-05