Commodore CM-402S 4-Position Compact Dual Battery Selector Switch, 12–32V DC

4-Position Compact Dual Battery Selector Switch

The 4-Position Battery Selector Switchis the ultimate solution for managing multiple battery banks in marine or RV electrical systems. Designed for12V to 32V applications, this switch allows you to isolate battery banks, combine them, or direct power to all loads with a simple turn. Engineered withtin-plated copper studs, the switch ensures maximum conductivity and corrosion resistance for reliable long-term performance in harsh environments.

This heavy-duty switch is IP66-rated for water resistance and features an ignition-protected design, meeting ISO 8846 and ABYC safety standards. The isolating cover with three snap-off side pieces protects rear contacts while allowing versatile wire access in any direction. With its robust one-piece terminal stud design and user-friendly operation, this battery switch is ideal for boats, RVs, and other off-grid applications requiring efficient power management.

Features:

• Switches Between 4 Positions: Allows flexible power management by isolating battery banks, combining them, or directing power to all loads for maximum versatility.
• Tin-plated copper Studs: Provides exceptional conductivity and corrosion resistance, ensuring efficient operation in harsh marine or RV environments.
• Durable One-Piece Terminal Stud Design: Prevents loosening over time, ensuring a secure connection and stable performance for extended use.
• Isolating Cover with Snap-Off Sides: Protects rear contacts while allowing easy wire access from any direction, making installation quick and hassle-free.
• IP66 Water-Resistant Rating: Built to withstand powerful water jets, making it perfect for marine applications or environments exposed to moisture and dust.
• Meets Strict Safety Standards: Certified to ISO 8846 Marine Ignition Protection, ABYC, UL 1500, and SAE J1171, ensuring compliance with industry-leading safety requirements.
• Compact and Lightweight Design: Weighing just 0.83 lbs (0.38 kg), this switch is compact yet robust, saving space while delivering maximum performance.
• High Current Handling Capability: Rated for 300A continuous and 900A cranking, this switch is ideal for high-power applications like engine start and onboard systems.

Specifications:

• Maximum Voltage: 32 VDC
• Switch Type: Selector 4-Position
• Battery Inputs: 1
• Color: Red
• Cable Clearance for 4/0 AWG Cables: 1.12 in (28.45 mm)
• Cable Size to Meet Ratings: 4/0 AWG (120mm2)
• Switch Positions: 4
• Battery Combine: Yes
• Alternator Field Disconnect: No
• Cranking Rating 30 seconds: 900A
• Continuous Rating: 300A
• Intermittent Rating: 500A (5 min)
• Mounting Holes: Accept #10 Screw
• Stud Material: Tinned Copper
• Stud Torque: 120 in-lb (13.56 Nm)
• Terminal Stud Size: 3/8 - 16 (M10)
• Weight: 0.77 lbs (0.35 kg)

Commodore CM-402S 4-Position Compact Dual Battery Selector Switch

The Commodore CM-402S 4-Position Compact Dual Battery Selector Switch provides practical power management for marine, RV, and off-grid electrical systems. Designed for 12–32V DC applications, it lets you isolate battery banks, combine batteries, or direct power to connected loads with a simple turn. Its compact red housing helps conserve installation space while supporting high-current engine-start and onboard electrical applications.

Built with tinned copper terminal studs, the CM-402S promotes efficient conductivity and corrosion resistance in demanding environments. The one-piece terminal stud design helps maintain a secure connection, while the isolating cover with snap-off side sections protects rear contacts and supports flexible cable access. With an IP66 water-resistant rating and ignition-protected construction, this selector switch is designed for use where moisture exposure and reliable battery control are important.

Key Features:

• Four switch positions: Isolates battery banks, combines batteries, or directs power to connected loads for flexible electrical control.
• High-current capacity: Supports a 300A continuous rating, 500A intermittent rating for 5 minutes, and 900A cranking rating for 30 seconds.
• Tinned copper studs: Provides conductive, corrosion-resistant connection points for marine and RV battery systems.
• Protected, flexible installation: The isolating cover shields rear contacts, while snap-off side sections allow cable access from different directions.
• Marine-focused protection: IP66 water resistance and ignition-protected construction support use in demanding electrical environments.
• Broad cable support: Accommodates 4/0 AWG cable to meet stated ratings and uses 3/8-16 (M10) terminal studs.

Product Details:

• Brand: Commodore
• Model: CM-402S
• Switch type: 4-position selector
• Maximum voltage: 32V DC
• Battery inputs: 1
• Battery combine: Yes
• Color: Red
• Cable size to meet ratings: 4/0 AWG
• Cranking rating: 900A for 30 seconds
• Continuous rating: 300A
• Intermittent rating: 500A for 5 minutes
• Stud material: Tinned copper
• Terminal stud size: 3/8-16 (M10)
• Mounting holes: Accept #10 screws
• Stud torque: 120 in-lb
• Alternator field disconnect: No
• Safety and compliance: ISO 8846 Marine Ignition Protection, ABYC, UL 1500, and SAE J1171
• Weight: 0.77 pounds

Choose the Commodore CM-402S for compact, high-current battery selection and dependable power control in marine, RV, and off-grid applications.

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