HD-Series Heavy Duty 3 Position Selector Battery Switch with AFD - HD-Series Heavy Duty 3 Position Selector Battery Switch with AFD

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Blue Sea Systems

11003-BSS

Battery selector switch HD-Series heavy-duty 3-position with AFD

The BLUE SEA HD-Series 11003-BSS battery selector is a rugged 3-position switch (OFF, 1 or 2) with Alternator Field Disconnect (AFD), designed for diesel engines and high-consumption systems. It provides a continuous current rating of 500A and IP66 protection. This HD-Series model sits above the m-Series and e-Series in current handling capacity. The product includes the battery selector and is ready for surface or rear-panel installation.

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116,35€

116,35€ ~~128,60€~~

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Prices shown excluding VAT for Türkiye. If your delivery address is in the European Union, the VAT of the destination country will be added at checkout.

Available in stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Product use	Selection and isolation of battery banks for power supply or emergency starting.
Switch type	3-position selector
Continuous current (A)	400
Intermittent current (A)	700
Cranking current (A)	1600
Maximum DC voltage	32
Number of poles	1
Positions	3
AFD protection	Oui
Terminal type	Dowel
Terminal size	M12-1.75 (1/2")
Wiring connection type	Through-bolted
Control type	Rotary
Mounting type	Surface-mount
IP rating	IP66
Operating voltage range	0-32
Panel cutout diameter mm	76.2
Dimensions (W x H x D)	98 x 98 x 72 mm
Warranty	99.0
Actuator color	Gray
Actuator style	Rotary
Amperage	400
Battery Inputs Count	2
Cable Size To Meet Ratings Awg	4/0 AWG
Installation type	Surface-mount installation
LED indicator	No
Make Before Break Feature	Yes
Fastener size (metric)	M6
Mounting hole spacing	76
Nominal voltage	32.0
Product range	HD-Series
Product subtype	Battery selector
Switching Current Rating	25
Switch function	Selection of insulated battery banks
Terminal Stud Length Mm	22.22
Terminal Stud Material	Tinned copper
Terminal Torque Nm	24.86

Detailed description

Designed for demanding marine electrical systems, the BLUE SEA HD-Series Heavy Duty 3-position battery selector switch with AFD, part number 11003, allows selection between two isolated battery banks (OFF, 1 or 2) for power supply or emergency starting. Part of the HD (Heavy Duty) series, it differs from the m-Series (300A continuous) and e-Series (350A continuous) by its ability to handle higher currents, with a continuous rating of 500A, an intermittent rating of 700A (5 min), and a starting current of 1,600A (30 sec). This positioning makes it suitable for applications requiring enhanced electrical robustness, particularly for large diesel engines and high-consumption systems.

Advanced protection and robust connectivity

One of the technical features of the 11003-BSS selector switch is its Alternator Field Disconnect (AFD) function, which protects the alternator diodes from destructive overvoltages if the switch is toggled to the OFF position while the engine is running. This safety is critical for equipment longevity. The device also features "Make-Before-Break" contact design, allowing seamless switching between battery banks without interrupting power supply—a key feature for sensitive electronic equipment.

Marine design and regulatory compliance

The terminals, made of tinned copper, are sized M12-1.75 (1/2") and offer a length of 22.22 mm (7/8") to accommodate multiple cable lugs. Their one-piece design reduces the risk of overheating and loosening over time. The recommended tightening torque is 24.86 N·m (220 in-lb). The selector switch accepts 4/0 AWG (120 mm²) battery cables to meet its rated values, with the option to connect two cables to the common terminal to meet the assigned value. Its design allows for surface or rear-panel mounting, with mounting holes accepting 1/4" (M6) screws. The 11003-BSS model complies with ABYC requirements, is UL Listed (UL 1107), UL 1500, and SAE J1171 for ignition protection, and is CE marked per ISO 8846, ensuring safe use in marine environments. It also features IP66 protection against water and dust intrusion.

Documentation

Type	Nom
	EN - Instructions - HD-Series Heavy Duty 3 Position Selector Battery Switch with AFD
	EN - M Series, E Series, And Hd Series Battery Switch Ope... - HD-Series Heavy Duty 3 Position Selector Battery Switch with AFD
	EN - Manual - HD-Series Heavy Duty 3 Position Selector Battery Switch with AFD
	EN - Certificate - HD-Series Heavy Duty 3 Position Selector Battery Switch with AFD
	EN - Certificate - HD-Series Heavy Duty 3 Position Selector Battery Switch with AFD

Expert opinion

Pol CONIN

Digital Manager

« Technical analysis: BLUE SEA HD-Series 3-position battery selector with AFD »

The BLUE SEA HD-Series 3-position battery selector with AFD is a reliable solution for power management on medium to large vessels equipped with diesel engines or high-demand electrical systems. Its key advantage is the Alternator Field Disconnect (AFD) function, which prevents costly alternator damage in the event of incorrect handling—unlike standard switches. This feature is critical for the longevity of critical charging system components. The "Make-Before-Break" design is also a major asset, ensuring uninterrupted power transitions essential for sensitive navigation and communication equipment.

In terms of installation, this model is designed to be mounted near the batteries and requires careful attention to wiring, particularly for integrating the AFD function. Using high-gauge cables (4/0 AWG, 120 mm²) and adhering to the 24.86 N·m torque specification for M12 terminals ensures optimal conductivity and minimizes hotspot risks. While it is not a "Dual Circuit Plus" switch with automatic combining functionality, its ability to manually select between OFF, Bank 1, or Bank 2 positions makes it a versatile choice. It is particularly well-suited for vessels where precise manual management of power sources is preferred, without the complexity of fully automated systems. However, consulting a professional for ABYC-compliant installation is essential, especially for connecting the alternator field line.

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Battery selector switch HD-Series heavy-duty 3-position with AFD

116,35€

116,35€ ~~128,60€~~

Frequently Asked Questions

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What is the primary function of the HD-Series 11003 battery selector?

The BLUE SEA HD-Series Heavy Duty 3-position battery selector with AFD, part number 11003, allows selecting between two isolated battery banks (positions OFF, 1 or 2) for general power or emergency starting.

What is the continuous rated current of this battery selector?

This battery selector switch has a continuous rated current of 500 amperes (A). It can also handle an intermittent current of 700 A for 5 minutes and a starting current of 1,600 A for 30 seconds.

What is the maximum operating voltage supported by this switch?

The maximum operating voltage for this switch is 32 Volts DC (direct current).

How does the AFD (Alternator Field Disconnect) function protect the alternator?

The AFD (Alternator Field Disconnect) function protects the alternator’s diodes from destructive overvoltages. This protection activates if the switch is turned to the OFF position while the engine is running, preventing damage to the alternator.

Is this selector suitable for applications with large diesel engines?

Yes, this selector is designed for demanding marine electrical systems and is particularly suited to applications requiring increased electrical robustness, especially for large diesel engines and high-consumption systems.

What are the nominal starting (30 sec) and intermittent (5 min) current ratings?

The nominal currents of this selector are:

Starting (30 seconds): 1 600 A
Intermittent (5 minutes): 700 A

What material are the terminals made of and what are their dimensions?

The terminals are made of tin-plated copper for maximum conductivity and corrosion resistance. Their size is M12-1.75 (1/2").

Is this battery selector switch explosion-proof for flammable vapors?

Yes, this selector is classified as ignition-protected. It is marked as such and meets the external ignition protection requirements UL 1500 and SAE J1171, as well as ISO 8846.

What is the length of the terminal studs on this switch?

The terminal studs are 22.22 mm (7/8") long, allowing multiple cable lugs to be fitted.

Does the design of the terminals provide any specific safety features?

Yes, the terminals are of one-piece design. This feature reduces the risks of overheating and loosening over time, ensuring safe and reliable connections.

Is this product compliant with international maritime standards?

Yes, this battery selector switch meets all American Boat and Yacht Council (ABYC) requirements for battery switches. It is also UL-listed per UL 1107 for electrical power switches and compliant with Directives 94/25/EC and 2003/44/EC.

What is the water resistance rating of this battery selector?

This battery selector switch has an IP66 ingress protection rating, meaning it is dust-tight and protected against powerful water jets.

Does this switch allow switching between batteries without cutting power?

Yes, this device features a "Make-Before-Break" contact design. This allows switching between battery banks without interrupting power supply, which is essential for sensitive electronic equipment.

What is the main difference between the HD series and the other Blue Sea Systems ranges?

The HD (Heavy Duty) series stands out for its ability to handle higher currents. Compared to the m-Series (300A continuous) and e-Series (350A continuous), the HD series offers a continuous current of 500A, an intermittent current of 700A, and a starting current of 1,600A, making it more robust for demanding applications.

Where is the ideal location to install this battery selector?

It is recommended to install the selector in an easily accessible location close to the batteries.

What is the recommended battery cable gauge for this switch?

To comply with the switch's nominal values, it is recommended to use 4/0 AWG (120 mm²) battery cables.

What is the correct torque for battery cable terminal bolts?

Battery cable terminals must be secured under the safety washer and nut with a torque of 24.86 N·m (220 lb-ft).

How should I wire the AFD function of the switch?

To wire the AFD function, you must cut the field wire running from the alternator to the voltage regulator. Then connect one end of this wire to terminal F1 of the switch and the other end to terminal F2.

Are there any important precautions to take before installing the selector?

Yes, before any installation, it is imperative to disconnect the positive terminal of the battery. It is also strongly recommended to consult a marine electrical professional to ensure correct and secure wiring.