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Black nylon industrial locking plug with four blades and external cord clamp

Hubbell Incorporated

Hubbell Incorporated CS8165C Locking Plug 50 A 480 V AC

SKU CH-PFJS-FMXWS

A 50 A, 480 V AC locking plug with three-pole, four-wire non-NEMA design and impact-resistant nylon housing for industrial power connections

  • Product type3 in Harsh Environment, Hook-and-Loop Closure
  • Product colorBlack/White
  • Secure 50 A 480 V AC power delivery with locking plug design
  • Withstands harsh conditions using impact and chemical resistant nylon housing
  • Prevents mismating through stainless steel shrouded contacts during connection
  • Handles extreme temperatures from -40 °C to +75 °C continuous operation
  • Accepts cord diameters 0.750 in to 1.125 in with two-piece strain relief

Industrial Locking Plug 50 A 480 V AC

The Hubbell CS8165C is a non-NEMA twist-lock plug built for industrial equipment that demands a secure 50-amp, 480-volt AC connection. Its four-blade, three-pole, four-wire configuration and shrouded stainless-steel contacts prevent mismating during hook-up. The nylon housing resists impact and chemicals while meeting a UL 94 HB flammability rating.

Cord Range and Temperature Limits

This plug accepts cord diameters from .750 in to 1.125 in and wire gauges from #10 AWG to #6 AWG, secured by a two-piece external clamp with offset gripping jaws. It operates continuously from -40°C minimum to +75°C maximum, with the thermoplastic polyester interior adding heat resistance. CSA C22 certification confirms compliance for these stated parameters.

Non-NEMA Four-Blade Configuration

The locking interface uses a proprietary four-blade pattern rather than a standard NEMA arrangement, so it mates only with matching Hubbell receptacles. Buyers whose equipment specifies a NEMA pinout or a different blade count cannot use this plug without changing the inlet. Verify the receptacle part number before ordering.

How it compares

Measured against everything we stock in AV Accessories & Components, at today’s prices. Recalculated every night.

Price $104.99
Pricier than about 76% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameHubbell Wiring Device-Kellems
Model nameCS8165C
Product type3 in Harsh Environment, Hook-and-Loop Closure
Product colorBlack/White

Questions about this item

Should I choose the 50 A 480 V AC locking plug or a different amperage version for my equipment?

Select this CS8165C plug only when your circuit is rated for 50 amps at 480 V AC; the device is built for that single rating and cannot be used on lower or higher amperage circuits.

What does the 50 A 480 V AC rating mean when the plug is installed in a real industrial panel?

It means the plug can continuously carry 50 amps at 480 volts AC within an operating range of -40 °C to +75 °C, with a nylon housing that resists impact and chemicals and a two-piece cord clamp that secures cables from .750 in to 1.125 in diameter.

The plug is described as non-NEMA with four blades — what interface standard does it follow and what does that limit in practice?

It follows a non-NEMA, three-pole four-wire grounding configuration with a stainless-steel shroud that prevents mismating; the design only mates with matching non-NEMA receptacles, so it cannot be used with standard NEMA twist-lock outlets.

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