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Blue Sea Systems Battery Switches - HD Series - 3 Position

This Blue Sea Systems three position battery switch offers 500 amps for large diesel engines. This switch switches isolated battery banks to all loads and features tin-plated copper studs for maximum conductivity and corrosion resistance. The studs accept 1/2" (M12) ring terminals and have a 7/8" stud length (22 mm) that can accept multiple cable terminals. Accepts up to 4/0 AWG battery cables. Blue Sea Systems one-piece terminal stud design never loosens over time. One-piece stainless flange nuts ensure safe and secure connections. Fits most Perko and Guest low amperage battery switch hole patterns. Case design allows surface or rear panel mounting options. Tactile indicator conveys knob position by feel. Includes Alternator Field Disconnect (AFD) which protects the diodes in the alternator in the event of the switch being switched to the OFF position while the engine is running. If the AFD is not used to protect the alternator, an LED can be connected to the AFD terminals to indicate when the battery switch is in any position but OFF.


  • 1-OFF-2
  • Cranking Rating (10 Sec.) 2,750A; Cranking Rating (1 Min.) 1,150A
  • Intermittent Rating (5 Min.) 700A
  • Continuous Rating 500A @ 32V DC Maximum
  • CE marked, ISO 8846, UL listed - UL1107 electrical power switches. Meets ABYC requirements. Meets UL 1500 and SAE J1171 external ignition protection requirements.
  • IP66
SINGLE CIRCUIT 3 POSITION 4 POSITION
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5445 Selector 3 Position Battery Switch with Alternator Field Disconnect, Black, 600A (BSS 11003) (1 MIN) 105.73 1 EA