Hubbell M4100C12R 100A 125/250V Female Shore Power Connector
Hubbell M4100C12R 100A 125/250V Female Shore Power Connector — Product description
The Hubbell M4100C12R (MPN M4100C12R, UPC 783585410036) is the female connector body for Hubbell's 100 amp ship-to-shore power cable system - the connector that goes on the BOAT END of the shore power cord and mates with the boat's M4100B12R shore power inlet. 100 ampere, 125/250 volt, 3-pole / 4-wire configuration - the standard heavy-duty shore power for larger boats requiring more than the typical 30A or 50A shore power capacity. Yellow Zytel super-tough nylon body - the high-impact nylon used throughout Hubbell's premium shore power line for its combination of strength, durability, and weather resistance. Gasketed locking ring creates a watertight seal at the inlet / connector interface when properly secured - critical for shore power connections that sit exposed at the dock for extended periods. Cord grip range accommodates 1.00 to 1.94 inch diameter shore power cable - matches the typical 100A marine shore power cable diameter. Mates with the M4100B12R shore power inlet specifically (the matched-pair inlet from Hubbell) - this connector is NOT compatible with regular receptacles or non-matching inlets. UL listed, ABYC compliant, corrosion resistant. Hubbell pioneered the 100A pin and sleeve marine standard with the National Electric Code and the American Boat and Yacht Council - the M4100C12R is Hubbell's mature implementation of the standard, designed for decades of marine service. For boats requiring 100A 125/250V shore power capacity (typical of larger yachts, sportfishers, and commercial fishing boats), the M4100C12R is the right connector for the cord-end termination.
The Hubbell M4100C12R is the female cord-end connector for Hubbell's 100 amp 125/250V marine shore power cable system - the part of the shore power cord that attaches to the BOAT END and mates with the boat's installed shore power inlet. For owners of larger yachts, sportfishers, commercial fishing vessels, and any boat requiring 100A shore power capacity (vs the typical 30A or 50A shore power of smaller boats), the M4100C12R is the standard connector that turns a length of 100A cable into a usable shore power cord.
What 100A shore power is and when you need it. Shore power is the AC electrical connection between a boat and the dock's electrical system. Boats use shore power to run AC appliances (battery chargers, refrigeration, air conditioning, water heaters, lighting, entertainment, kitchen appliances) without running the engine or generator. Shore power ratings define how much power the connection can handle: 30A 125V (the entry-level, typical of small to mid-size boats - 3600 watts max), 50A 125/250V (the standard for mid-to-large boats - 12,500 watts max), and 100A 125/250V (the heavy-duty rating for larger yachts and commercial boats - 25,000 watts max). The 100A rating is needed when a boat has substantial AC loads: multiple air conditioning units, electric heating, electric stove / oven, washer / dryer, multiple electric water heaters, electric induction cooktops, or any combination totaling more than 50A. For owners of boats large enough to need this much power, the 100A shore power system is the right configuration.
The 3-pole 4-wire configuration. The M4100C12R is 3-pole / 4-wire: two hot conductors (125V each, totaling 250V across the two), one neutral, and one safety ground. This configuration supports both 125V loads (using one hot leg plus neutral) and 250V loads (using both hot legs together). Typical 125V loads: standard outlets, lighting, electronics. Typical 250V loads: air conditioning, electric water heaters, electric stoves, washer / dryer. The dual-voltage capability means a single shore power connection serves all the boat's AC needs - much more flexible than 125V-only or 250V-only configurations.
What 'female connector body' means in the system. Shore power systems use matched-pair connectors: a male inlet permanently installed on the boat, a female connector at one end of the shore power cord that mates with the boat's inlet, a male plug at the other end of the cord that mates with the dock's receptacle, and a female receptacle permanently installed at the dock. The M4100C12R is specifically the FEMALE CONNECTOR for the boat-end of the shore power cord - the part you'd handle when plugging in to the boat. The matched pieces for a complete 100A system: M4100B12R (the boat-installed inlet that mates with this connector), M4100P12 (the male plug for the dock-end of the cord), and M4100R12 (the dock-installed receptacle). For a complete cord, you'd use the M4100C12R on one end and M4100P12 on the other end with a length of 100A 4-conductor marine cable between them.
Yellow Zytel super-tough nylon body. Zytel is DuPont's brand name for super-tough nylon - the polymer Hubbell uses throughout the M4100 series for the connector bodies. Properties: high impact resistance (handles being dropped, stepped on, or impacted without cracking - shore power cords get rough handling), high tensile strength (won't tear or break under cord tension), UV resistance (doesn't yellow or degrade in years of dockside sun exposure), chemical resistance (handles diesel fuel, gasoline, oils, cleaning chemicals commonly present on docks), and broad temperature range (operates correctly from freezing temperatures to hot summer dock temps). The yellow color is the standard convention for the 'live' / energized end of marine shore power cables - high-visibility for safety in dim dockside conditions.
Gasketed watertight locking ring. The connector includes a gasketed locking ring that screws onto the matching mate (the M4100B12R boat inlet). When properly secured: the gasket creates a watertight seal at the connection interface (prevents water intrusion that could short circuit the 100A connection), the locking ring mechanically secures the connector to the inlet (prevents accidental disconnection from cord weight, wave motion, or someone tripping over the cord), and the locking action requires deliberate effort to disconnect (you can't just yank the cord out, the locking ring must be unscrewed first). Critical safety feature for the 100A power level - accidental disconnection of 100A while under load would cause arcing damage and potential electrical fire.
Cord grip - 1.00 to 1.94 inch cable diameter. The internal cord grip holds the shore power cable securely within the connector body, providing strain relief that prevents the cable conductors from being pulled out of their terminal connections under cord weight or tension. The grip accommodates cable diameters from 1.00 to 1.94 inches (25.4 - 49.3 mm) - the typical range for 100A 4-conductor marine shore power cable. Verify your cable diameter falls in this range before ordering - cables outside this range won't seat properly in the cord grip and won't provide proper strain relief.
UL listed and ABYC compliant. The M4100C12R is UL listed for marine shore power applications - meaning the product has been independently tested and certified to UL marine electrical standards. ABYC compliant - meets American Boat and Yacht Council electrical standards (the marine industry's electrical design standards). The dual certification matters for insurance compliance, marine surveyor inspection, and any installation where code compliance is required. Hubbell helped develop the 100A marine shore power standards with both NEC (National Electric Code) and ABYC - the M4100C12R is the implementation Hubbell uses to demonstrate the standards.
Corrosion resistance. Internal components (terminal blocks, pins / sleeves, locking mechanism) use corrosion-resistant materials specifically chosen for marine environments. The brass / bronze internal components resist saltwater corrosion that would destroy cheaper materials within a season or two. The Zytel exterior protects internal components from direct moisture exposure. Combined, the corrosion resistance package delivers multi-decade service life in typical marine shore power applications.
Building a complete shore power cable. The M4100C12R is one component of a complete shore power cable - you typically need: this connector body (M4100C12R, the boat-end of the cord), a matching male plug (M4100P12, the dock-end of the cord), and the appropriate length of 100A 4-conductor marine shore power cable (Hubbell makes pre-cut cable, other marine suppliers also stock it). For owners replacing a failed cord-end connector on an existing 100A shore power cord, you only need the M4100C12R (the existing cable and dock-end plug stay). For new complete cord builds, source all the components and assemble per the Hubbell installation instructions. For owners not comfortable building shore power cords, pre-assembled 100A shore power cords with matching connectors are available from Hubbell and marine chandleries - more expensive than DIY but eliminates the assembly responsibility.
Key Features
- Hubbell M4100C12R 100A 125/250V female cord-end connector body
- For 100A marine ship-to-shore power systems
- 3-pole / 4-wire configuration (two hots + neutral + ground)
- Supports both 125V and 250V loads simultaneously
- Yellow Zytel super-tough nylon body (high-impact, UV-resistant, chemical-resistant)
- Gasketed locking ring for watertight inlet / connector interface
- Mechanical locking prevents accidental disconnection under load
- Cord grip accommodates 1.00 - 1.94 inch (25.4 - 49.3 mm) cable diameter
- UL listed for marine shore power applications
- ABYC compliant for American Boat and Yacht Council electrical standards
- Corrosion resistant internal components for marine service
- Mates with Hubbell M4100B12R shore power inlet (matched pair)
- For BOAT END of shore power cord (not dock end - use M4100P12 plug for dock end)
- Designed for larger yachts, sportfishers, commercial fishing boats requiring 100A capacity
- Hubbell pioneered the 100A pin and sleeve marine standard with NEC and ABYC
- Manufacturer Part Number M4100C12R / UPC 783585410036
Why Buy from NVN Marine
- Authorized Hubbell Marine reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Hubbell M4100C12R 100A 125/250V Female Shore Power Connector Body for 3-Pole 4-Wire System |
|---|---|
| Brand | Hubbell Marine |
| Manufacturer Part Number | M4100C12R |
| UPC | 783585410036 |
| Type | Female cord-end connector body (boat end of shore power cord) |
| Amperage | 100 amps |
| Voltage | 125/250V (3-pole / 4-wire) |
| Pole / Wire Configuration | 3 pole / 4 wire |
| Body Material | Yellow Zytel super-tough nylon (DuPont) |
| Color | Yellow (standard for marine cord live ends) |
| Sealing | Gasketed locking ring (watertight when properly mated) |
| Mechanical Lock | Threaded locking ring prevents accidental disconnection |
| Cord Grip Range | 1.00 - 1.94 inches (25.4 - 49.3 mm) cable diameter |
| Mates With | Hubbell M4100B12R shore power inlet (matched pair) |
| Does NOT Mate With | Regular receptacles or non-matching inlets |
| Certifications | UL listed, ABYC compliant |
| Corrosion Resistance | Yes - marine-grade internal materials |
| UV Resistance | Yes (Zytel nylon resists yellowing and degradation) |
| Chemical Resistance | Yes (handles diesel, gasoline, oils, dock cleaning chemicals) |
| Recommended Cable | 100A 4-conductor marine-rated shore power cable |
| Typical Service Life | 10-15+ years with proper care |
| Suitable Applications | Larger yachts, sportfishers, commercial fishing boats requiring 100A capacity |
| NOT Suitable For | Boats with 30A or 50A shore power (use appropriate smaller-amperage Hubbell connectors) |
| Warranty | Standard Hubbell Marine limited warranty |
Frequently asked questions
What is this connector for?
The M4100C12R is the female cord-end connector for Hubbell's 100 amp 125/250V marine shore power cable system. It attaches to the BOAT END of the shore power cord and mates with the boat's installed M4100B12R shore power inlet. For owners of larger boats requiring 100A shore power capacity, the M4100C12R is the standard connector that completes the cord from the dock to the boat. NOT a replacement for 30A or 50A shore power connectors - it's specifically for 100A systems.
What boats need 100A shore power?
100A 125/250V shore power is needed when a boat has substantial AC electrical loads: multiple air conditioning units (especially central air systems), electric heating, electric stove / oven, washer / dryer, multiple electric water heaters, electric induction cooktops, electric vehicle charging, or any combination of loads totaling more than 50A. Typical applications: larger motoryachts (40+ ft), sportfishers with full galley and AC, larger sailboats with extensive AC systems, commercial fishing vessels, and any boat designed to live aboard with shore-powered electric appliances. For boats with simpler AC needs (just battery charger, refrigeration, lights), 30A or 50A shore power is plenty and the matching smaller-amperage connectors are the right choice.
What's the difference between this and the M4100P12 plug?
Both are part of Hubbell's 100A shore power cable system, but they're on opposite ends of the cord. M4100C12R (this product): FEMALE connector body for the BOAT END of the cord - mates with the M4100B12R shore power inlet on the boat. M4100P12: MALE plug for the DOCK END of the cord - mates with the M4100R12 dockside receptacle. A complete shore power cord uses ONE of each: the M4100C12R on the boat end and the M4100P12 on the dock end, with the appropriate length of 100A cable between them. For replacing a failed connector on an existing cord, identify which end (boat or dock) is failing and order the correct part.
Will this fit my shore power cord?
Depends on your cord's existing connector type. The M4100C12R fits 100A 4-conductor marine shore power cable with overall diameter 1.00 - 1.94 inches (25.4 - 49.3 mm). For 100A cable in this diameter range, the cord grip accommodates the cable for proper strain relief. For cables outside this range, the M4100C12R won't grip properly. Also verify your cord is 100A rated - using a 100A connector on smaller-rated cable creates a fire hazard. For boats with existing 30A or 50A shore power, the M4100C12R is the wrong connector - use the appropriate Hubbell 30A or 50A connector instead.
Can I assemble a shore power cord myself?
Possible for experienced marine electricians with proper tools and training. The assembly requires: stripping the cable conductors to specific lengths, properly terminating each conductor in the connector's terminal blocks (correct torque on terminal screws is critical), securing the cord grip for strain relief, and verifying assembly with continuity and insulation resistance testing. Improper assembly creates a 100A connection that could fail under load with fire risk - meaningful safety issue. For owners not comfortable with shore power assembly, pre-assembled 100A shore power cords are available from Hubbell and marine chandleries - more expensive than DIY but eliminates the assembly responsibility. Hire a licensed marine electrician if uncertain.
What's 'ABYC compliant' and why does it matter?
ABYC (American Boat and Yacht Council) publishes the electrical standards used throughout the U.S. marine industry. ABYC compliance means the M4100C12R meets the relevant electrical safety, materials, and performance standards for marine shore power. Practical implications: required for insurance compliance on many marine policies, expected by marine surveyors during boat inspections, and required by code in many marine installations. For boats subject to marine surveys (insurance renewal, sale, purchase), using ABYC-compliant components avoids inspection problems. UL listing on top of ABYC compliance adds independent testing certification.
Why is it yellow?
Yellow is the standard color convention for marine shore power cord 'live' / energized ends. The high-visibility color makes the cord obvious in dim dockside lighting conditions, reducing the chance of someone tripping over it or accidentally disconnecting it. The color convention extends across Hubbell's marine shore power product line (yellow connectors and plugs, gray inlets and receptacles for the boat-mounted side, depending on the specific product). For visual identification in busy marina conditions, the bright yellow color matters.
Is the connector watertight?
Yes - when properly mated and locked, the gasketed locking ring creates a watertight seal at the inlet / connector interface. The seal prevents water intrusion that could short-circuit the 100A connection or cause corrosion of internal contacts. Important caveat: the seal requires the locking ring to be properly tightened. Loose locking rings (from being only partially threaded) don't compress the gasket properly and don't create the watertight seal. Always tighten the locking ring fully when connecting shore power. For long-term dockside connections (boat at slip with shore power connected 24/7), inspect the locking ring periodically to verify it's still tight - vibration and temperature cycling can loosen it over time.
How do I install a connector on a shore power cable?
Standard procedure for an experienced marine electrician: (1) Cut the cable to the desired length with marine-grade cable cutters. (2) Strip the cable jacket back about 3 inches to expose the four conductors. (3) Strip each conductor to the specified length per the Hubbell instructions. (4) Slide the cord grip and rear connector body onto the cable. (5) Terminate each conductor in the correct terminal position (two hots, one neutral, one ground - per the wire colors and labels). (6) Torque each terminal screw to the specified value (typically 25-30 in-lbs - critical for the high-current connection). (7) Reassemble the connector body and tighten the cord grip for strain relief. (8) Test the assembly with a continuity meter and an insulation resistance tester before energizing. Follow the included installation instructions carefully - improper assembly is a fire hazard.
How long should it last?
Typical service life is 10-15+ years in marine service with proper care. The Zytel housing handles the marine environment indefinitely. The internal contacts wear slowly over years of repeated connection cycles - in liveaboard applications with daily connect / disconnect, expect maybe 8-10 years. In typical recreational boating use (connect / disconnect a few times per month), 15+ years is common. Replace when you see: visible cracking in the housing (UV degradation finally caught up), corrosion at the contact pins / sleeves, intermittent connection (slight wiggle of the connector causes power dropout), or any signs of heat damage / discoloration at the terminals.
Is there a warranty?
Standard Hubbell Marine limited warranty applies for manufacturing defects in materials and workmanship. Hubbell's warranty service runs through authorized Hubbell / marine distributors in the U.S. Save the receipt and original packaging for warranty service. Improper installation or misuse voids the warranty - follow the installation instructions carefully.
What other connectors do I need for a complete shore power system?
For a complete 100A marine shore power installation, you need: (1) The boat-installed inlet - Hubbell M4100B12R (the male inlet permanently mounted on the boat's exterior, mates with this M4100C12R connector). (2) This female cord-end connector - M4100C12R. (3) 100A 4-conductor marine shore power cable (sold by the foot - typical lengths 25-50 ft for residential docks, longer for marina slips with distant pedestals). (4) The male dock-end plug - Hubbell M4100P12 (goes on the other end of the cord, mates with the dock receptacle). (5) The dock-installed receptacle - Hubbell M4100R12 (already installed at the marina or in residential dock setups). Plus optional accessories like cord covers, strain relief at the dock, and cord storage when not connected. Total cost for a complete 100A shore power install (boat-side + cord + dock-side): typically $1,800-3,000 in parts depending on cord length.
