Middle Atlantic CS6365N.OEM Locking Plug 50A 125/250V

Name: Middle Atlantic CS6365N.OEM Locking Plug 50A 125/250V
Brand: Middle Atlantic
SKU: CS6365N.OEM

★★★★★3.8 (9 reviews)

A 50A locking plug built from solid brass contacts and nylon-reinforced housing for industrial power connections that stay locked under load.

$53.88*$60.65Save 11%

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Overview

The Marinco CS6365N.OEM is a field-wireable locking plug rated for 50 amps at 125/250V, built to the NEMA CS6365 standard for single-phase, 2-pole, 3-wire configurations. The construction centers on two materials chosen for performance under load: nylon for the housing, selected for its chemical resistance and 125°C continuous temperature rating, and #10 solid brass for the contacts, which provides the conductivity and oxidation resistance needed at a 50A connection point. The perma-lock terminal system addresses the most common failure mode of high-current connectors — the gradual loosening of screw terminals under thermal cycling — by maintaining consistent clamping pressure on the conductor regardless of how many heat-cool cycles the connection has seen.

This plug is specified for industrial and commercial power distribution: generators at live events, shore power connections, equipment panels in manufacturing facilities, and anywhere a 50A single-phase load needs a connection that physically cannot pull free under tension. The locking NEMA profile requires deliberate rotation to engage and disengage, which is the defining practical advantage over straight-blade alternatives in environments where cables are under physical stress. It is a professional-grade component that demands professional installation — anyone specifying it for a project should budget for a licensed electrician and verify the full circuit, receptacle, and wire gauge are matched to the 50A rating.

Key Features

Nylon- Tough and resistant to a wide range of chemicals

Perma-lock terminals provide superior holding

#10 solid brass for excellent conductivity

125 degrees Celsius continuous use

Specifications

Brand

Marinco Power Products

Model

CS6365N.OEM

Amperage

50A

Voltage

125V/250V

Phase

Single Phase

Poles

Wires

Housing Material

Nylon

Contact Material

#10 Solid Brass

Terminal Type

Perma-lock

Continuous Temperature Rating

125°C

Configuration

NEMA CS6365 Locking

Pros & Cons

👍 Pros

Solid brass #10 contacts provide excellent electrical conductivity and resist oxidation at the connection point over years of use.
Nylon construction offers strong chemical resistance and handles continuous operating temperatures up to 125°C without deformation.
Perma-lock terminals maintain consistent clamping force through thermal cycling, reducing the long-term risk of a loose, high-resistance connection.
NEMA CS6365 locking configuration prevents accidental disconnection under load — the plug physically locks into the receptacle.
50A/125V-250V rating covers a wide range of demanding single-phase commercial and industrial power requirements.

👎 Cons

Field wiring a 50A plug requires a licensed electrician in most jurisdictions — this is not a consumer self-install product.
The OEM designation means packaging and documentation may be minimal compared to retail-packaged versions; verify compatibility before ordering for a specific application.
Nylon housings, while chemical-resistant, are less impact-resistant than metal alternatives in high-abuse industrial environments where plugs are frequently dropped or dragged.
At 50A/250V, the plug is over-specified for any application under 30A, adding unnecessary bulk and cost if a lower-rated connector would suffice.

Frequently Asked Questions

What devices or applications is the CS6365N.OEM designed to connect?

This is a NEMA CS6365 locking plug rated for 50 amps at 125/250V, single-phase. It's designed for high-draw industrial and commercial equipment — generators, large power distribution boxes, stage power, and similar demanding single-phase loads where a standard straight-blade plug would be unsafe.

What makes the perma-lock terminals different from standard screw terminals?

Perma-lock terminals use a design that maintains clamping force on the conductor over time, reducing the risk of the terminal loosening due to thermal cycling or vibration. Standard screw terminals can back off gradually under repeated heating and cooling, which increases resistance at the connection and creates a fire hazard.

Is the nylon housing rated for outdoor or wet-location use?

The nylon construction is chemical-resistant and rated for 125°C continuous use, making it suitable for industrial environments. Always verify the full installation meets local electrical code requirements for the specific location and weather exposure.

What wire gauge does this plug accept?

The CS6365N.OEM is configured for the wire gauges appropriate to a 50A circuit. Consult Marinco's installation documentation for the precise range of conductor sizes the terminals accept, and ensure your wire gauge matches the circuit's amperage rating.

Can this plug be field-wired, or does it require a professional installation?

It is a field-wireable plug — the housing disassembles to accept the conductors, which are then terminated at the solid brass contacts. Installation should be performed by a qualified electrician given the 50A voltage and amperage ratings involved.