Battery Master Switch 2-Pole BS 5510e

The BS 5510e is the dual-circuit battery master switch from the Blue Sea Systems e-Series, specially designed for electrical systems with two separate, isolated battery banks. It switches both circuits simultaneously via a single knob – ideal for boats and off-road vehicles with strictly separate starting and house batteries or for applications where positive and negative conductors must be disconnected together.

Advantages

• Dual-Circuit Technology: switches two electrically isolated battery circuits simultaneously, without connecting the circuits to each other
• One of the few designs that can also disconnect positive and negative conductors simultaneously, as there is no combine function
• Tin-plated copper studs for maximum conductivity and corrosion resistance
• One-piece terminal stud design that won't loosen even with vibration
• Tactile indicators show the switch position even without visual contact
• Fits common mounting patterns for Perko and Guest battery switches

Technical Data & Compatibility

• Switch Function: Dual Circuit™ – simultaneous switching of two isolated battery circuits
• Continuous Current: 350 A per circuit
• Peak Current: 700 A / 30 sec. per circuit (Intermittent 5 min.: 525 A per circuit)
• Voltage: max. 32 V DC
• Mounting Type: universal surface, flush, or panel mounting
• Connections: Studs for 3/8" (M10) ring terminals, cables up to 4/0 AWG (120 mm²), 22 mm stud length for multiple cable lugs

For which electrical system is the BS 5510e suitable?

The BS 5510e is the right choice when two battery banks – such as a starter battery and a house battery or two completely independent on-board electrical circuits – need to remain strictly separate yet be operated via a common switch. Since the switch does not have a combine function, it is also suitable for installations where both the positive and negative conductors of a circuit are to be interrupted simultaneously.

Typical applications include boats with separate electrical systems for the engine and living area, as well as off-road and expedition vehicles with independent supply circuits for vehicle electrics and superstructure.