Maretron
Maretron 12 Circuit Bypass Module NMEA 2K w/o Fuse Pack & Jumper Wire
Best manual backup for boaters relying on digital electrical load controllers.
The Maretron 12 Circuit Bypass Module (CBMD12) offers essential manual control for your electrical loads, integrating seamlessly with the MPower 12-Channel DC Load Controller Module. This module ensures your loads remain operational during CLMD12 malfunctions or NMEA 2000 network failures. It supports both 12V and 24V DC systems and features Carling Curvette Rocker Switches for reliable, arcless manual overrides. Overcurrent protection is handled by standard ATC fuses, providing a robust alternative to digital switching methods. This unit is sold without the fuse pack or jumper wire.
$155.00
Owner Satisfaction
4.5
/ 5
Category Rank
211
/ 768
#211 in Power Control Units
Price vs Category Average
-83%
Below average
Circuit Capacity
12
/ Circuits
Who it's for
- Installers managing limited space in complex electrical panels
- Vessel captains prioritizing fail-safe electrical reliability
- Network administrators seeking centralized digital monitoring
Who should skip it
- Technicians avoiding complex software-based network configurations
- Budget-conscious boaters preferring traditional analog switching
- DIY installers wanting an all-inclusive, ready-to-mount solution
Performance breakdown
Redundancy Reliability
Provides a critical fail-safe for digital switching system outages.
Manual Override Control
Carling rocker switches offer tactile, immediate control over every circuit.
System Compatibility
Seamlessly bridges 12V and 24V setups for versatile marine power management.
Installation Complexity
Requires manual fuse and jumper configuration for a complete setup.
Load Capacity
Handles up to 75 amps across twelve distinct, protected circuit paths.
Build Durability
Rugged construction designed to withstand demanding marine electrical environments.
Key Specs
Circuit Capacity
12 Circuits
Maximum Current Capacity
75 Amps total
Output Current Limits
12A Max (two outputs), 10A Max (six outputs), 5A Max (four outputs)
Power System Compatibility
12V DC and 24V DC
Control Interface
12 Carling Curvette® Rocker Switches
Overcurrent Protection
Standard ATC fuses (not included)
Network Compatibility
NMEA 2000
Features
- Manual ON/OFF control for 12 independent loads.
- Ensures operation during controller or network failures.
- Arc-free manual load overriding with rocker switches.
- Eliminates fuse-handling risks for connection integrity.
- Compatible with 12V and 24V DC systems.
- Reliable overcurrent protection with standard ATC fuses.
- Independent circuit control via separate switches.
What customers say
Professional installers highly value the Maretron Bypass Module for its robust NMEA 2000 network utility. Users consistently praise its essential role in simplifying troubleshooting by allowing fault isolation without system disruption. The build quality is frequently noted as exceptionally reliable, meeting high marine standards. While the premium price point is a common point of friction, the consensus is clear: for mission critical applications where network stability and ease of maintenance are paramount, this module is an indispensable, top-tier solution. Its diagnostic utility justifies the investment for serious users demanding long term reliability.
Know before you buy
The CBMD12 provides a manual override for your electrical loads. It ensures your equipment remains operational if your primary digital controller or the NMEA 2000 network experiences a failure.
No, this specific unit is sold without the fuse pack or jumper wire. You will need to source standard ATC fuses separately to complete the installation.
Yes, the CBMD12 is fully compatible with both 12V and 24V DC power systems, making it a versatile choice for various marine electrical setups.
Yes, the circuits have different capacities: two outputs support up to 12A, six outputs support up to 10A, and four outputs support up to 5A. The total current capacity for the entire module is 75 Amps.
The module uses 12 individual Carling Curvette rocker switches. These allow you to manually toggle each load on or off independently, bypassing the digital switching system entirely.
Yes, the CBMD12 is designed to integrate seamlessly with the Maretron MPower 12-Channel DC Load Controller Module (CLMD12) to provide a reliable backup solution.
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$155