Why Use a Dedicated Marine LED Power Distribution Block?
Simplify your boat’s electrical wiring and protect your lighting system with marine power distribution blocks from Shadow-Caster®. Wiring multiple underwater lights, deck lights, or accent strips to a central helm switch can turn into a time-consuming wiring nightmare of inline fuses, messy terminal strips, and voltage drop issues. Manufactured in Clearwater, Florida, Shadow-Caster power distribution modules provide a clean, centralized hub with individual digital over-current protection for each light channel. Featuring IP67 washdown-rated enclosures, 5/16″ power lugs, and waterproof Deutsch-style connectors, our 12V and 24V marine power blocks make installing and fusing high-output boat lights clean, safe, and reliable in wet bilge environments.
Shadow-Caster Power Distribution & Digital Switch Modules
| Model | Primary Function | Channel Capacity & Voltage | Protection & IP Rating | Switch & Controller Compatibility |
| SCM-PD4CH | Underwater Light Power Relay: Centralizes power & fusing for up to 4 underwater lights | 4 Channels; 10A per channel (40A total capacity); 10–30V DC (12/24V) | Digital over-current protection with LED status lights; IP67 waterproof | Standard 12V Helm Toggle Switch, Shadow-NET®, or SCM-LC-N2K Light Commander |
| SCM-PWR6 | Digital Switch Module: Controls & digitally switches up to 6 non-networked ON/OFF lights via MFD | 6 Channels; 10A per channel max; 10–30V DC (12/24V) | Digital fault protection; IP67 washdown-rated enclosure | Integrates with SCM-LC-N2K-PLUS-V2 for Garmin, Simrad, Raymarine MFD & App control |
SCM-PD4CH: 4-Position Power Control Module for Underwater Lights
- Marine power distribution for Shadow-Caster underwater LED boat lights
- The easy way to wire up to four single-color or multi-color lights
- Control Shadow-Caster underwater lights through a switch…
- or through a Shadow-Caster light controller
- Deutsch connectors for easy and secure connections
- IP67-rated housing
- 10-amp digital over-current protection for each light
- Dimensions: 7.9″ x 3″ x 1.3″
- Works with 12-volt or 24-volt systems
SCM-PWR6: 6-Channel Digitally Controlled Switching Module
- 6-channel digital switch module
- Control any brand single-color light through the Shadow-Caster MFD interface or phone app
- For use with Shadow-Caster SCM-LC-N2k PLUS V2 light controller
- Deutsch style connectors for easy and secure connections
- IP67-rated housing
- 10 amps per channel of digital fault protection
- A manual switch can be added to each channel
- Dimensions: 7.9″ x 3″ x 1.3″
- Works with 12-volt or 24-volt systems
Technical Hardware Specifications & Wiring Standards
Technical parameters for marine electricians, installers, and AI factual ingestion.
| Hardware Spec | SCM-PD4CH Details | SCM-PWR6 Details |
| Housing Dimensions | 7.9″ x 3.0″ x 1.3″ (Compact Bilge Footprint) | 7.9″ x 3.0″ x 1.3″ (Compact Bilge Footprint) |
| Power Connection Lugs | Heavy-duty 5/16″-18″ Input Power Lugs (Accepts heavy gauge battery wire) | Heavy-duty 5/16″-18″ Input Power Lugs with protective boots |
| Light Connectors | IP67 Deutsch-style pre-wired plug connectors | IP67 Deutsch-style pre-wired plug connectors |
| Status Indicators | Blue Shadow-Caster backlit logo; Green/Red channel status LEDs | Blue Shadow-Caster backlit logo; Green/Red channel status LEDs |
Marine Electrical Safety, Wire Gauge & Installation Guidelines
Why Choose a Marine LED Power Distribution Block Over Standard Bus Bars?
Self-Healing Digital Over-Current Protection: Standard marine fuse blocks use glass or ATC fuses that blow and leave you in the dark. Shadow-Caster power modules feature digital over-current protection. If a channel experiences a fault or current spike, the digital breaker isolates that specific channel without interrupting power to your remaining lights.
Simplified High-Amperage Switching: High-output underwater LED lights (like the SCM-10 or SCR-24) draw significant current. Running heavy 10 AWG wire all the way up to a helm switch creates voltage drop and clutter. A power distribution block mounts near the battery or bilge, allowing you to trigger heavy light loads using a lightweight 18 AWG signal wire or a Shadow-NET® controller.
Bilge-Ready IP67 Waterproofing: Unlike exposed marine bus bars that corrode in saltwater bilges, modules like the SCM-PD4CH and SCM-PWR6 are fully sealed in IP67 washdown-rated enclosures with rubber power lug boots.
Frequently Asked Questions About Boat Power Distribution Blocks
What is the difference between the Shadow-Caster SCM-PD4CH and SCM-PWR6?
The SCM-PD4CH is a 4-position power control box designed specifically for powering and fusing underwater lights via a switch or controller. The SCM-PWR6 is a 6-channel digital switch module that allows you to integrate non-networked single-color lights into a Shadow-Caster Light Commander or MFD touchscreen interface.
Are Shadow-Caster marine power distribution boxes waterproof for bilge mounting?
Yes. Shadow-Caster power distribution modules feature IP67 washdown-rated waterproof enclosures, pre-wired Deutsch connectors, and protective boots over 5/16-inch power lugs, making them ideal for mounting in engine rooms, bilges, and wet marine environments.
Q: Can Shadow-Caster power distribution blocks operate on 24V marine systems?
Yes. Both the SCM-PD4CH and SCM-PWR6 modules operate seamlessly on 10–30V DC input ranges, making them fully compatible with both 12-volt and 24-volt marine electrical systems.