Blue Sea 20A Unipolar Thermal Magnetic Circuit Breaker - BS7057

Brand: Blue Sea
The 20A unipolar thermal magnetic circuit breaker ensures maximum safety in marine electrical installations.
Manufacturer part number: BS7057
Vendor: Marine Point
Availability: 6 in stock
€9.30 incl tax
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The 20A unipolar thermal magnetic circuit breaker by Blue Sea combines magnetic protection (against short circuits) and thermal protection (against overload), thus guaranteeing maximum safety in demanding marine electrical installations. Its compact design allows installation in panels with limited space via threaded collar, optimizing protection where you need it most.

Technical Specifications

  • Type: Unipolar thermal magnetic circuit breaker
  • Nominal current: 20A
  • Mounting: Threaded collar for panel
  • Compact size: easy integration
  • Brand: Blue Sea
  • Manufacturer reference: BS7057

Main Advantages

  • Dual protection mechanism: thermal and magnetic.
  • Quick and reliable response to overloads or electrical short circuits.
  • Ideal for limited spaces in boat electrical boards.

Recommended Applications

  • Electrical installations for propulsion systems, pumps, heaters, and onboard electronics.
  • Distribution panels requiring precise protection for medium-high demand equipment.

Installation and Maintenance

  • Always install with power disconnected.
  • Periodically check fastening and absence of abnormal heating.
  • Replace the breaker if you detect failures in automatic disconnection.
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