Mpower Bypass Module

Maretron MPower CBMD12 12-Channel Bypass Module — Module Only

A manual override panel that gives you physical switch control over every CLMD12 load circuit if the NMEA 2000 network fails or the CLMD12 itself malfunctions — 12 Carling Curvette rocker switches and individual ATC fuse protection per channel.

Why It's Worth It
Digital switching systems are only as reliable as the network and electronics that control them — which is exactly why a bypass module exists. If the CLMD12 loses network communication or fails entirely, the CBMD12 lets you unplug the J1 connector from the CLMD12 and plug it into the CBMD12 instead, giving you direct switch control over every load with no network dependency. The Carling Curvette rocker switches are purpose-built for marine environments (corrosion, temperature, vibration, and shock rated) and produce no arcing during switching — a safety consideration in a bilge or fuel vapor environment. ATC fuse protection per channel uses the same current ratings as the CLMD12 outputs, and the fuse slot markings eliminate the need to cross-reference a chart.

CBMD12 vs. CBMD12-R
The base CBMD12 is the module only — without the red 6AWG bypass jumper wire (A3720) or fuse pack (A3721). If you need those components, order the CBMD12-R instead, or source the A3720 and A3721 accessories separately.

Important Limitations
The CBMD12 does not support paralleled outputs or PWM dimming — if your CLMD12 installation uses paralleled circuits or dimmable lighting, those features are unavailable in bypass mode.

Use
Install adjacent to or near the CLMD12. To activate bypass: ensure area is free of fumes, set all CBMD12 switches to OFF, connect DC power to the 1/4"-20 stud, unplug J1 from the CLMD12, and plug J1 into the CBMD12. Switch labels on the CBMD12 correspond to CLMD12 breaker numbers — not sequential left-to-right — so use the label under the ABS cover to identify which switch controls which load.

In The Box:

CBMD12 Bypass Module Only (Jumper Wire and Fuse Pack Not Included — Order CBMD12-R or Source A3720/A3721 Separately)

Package Dimensions/Shipping:

Qualifies for Ground and 2 Day

Product Support:

Subscription Information:

Release Date:

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* ALL WARRANTY IS THROUGH MANUFACTURE *