Authorized Meltric Distributor
Meltric 39-28247-K04-172 - DR250 INLET METAL | Size 6 TYPE 3R 3P+N+G | 250A 277/480 VAC 60 Hz +2 AUX
Meltric

39-28247-K04-172

UPC: 130.10"

Contact for Pricing

Overview

The Meltric DR250 Inlet Metal (SKU: 39-28247-K04-172) is a high-current industrial power inlet designed for heavy-duty applications requiring 250A at 277/480VAC and 60Hz. This Size 6 inlet features a NEMA Type 3R metal enclosure, providing reliable protection against rain, sleet, and external ice formation in outdoor or harsh environments. The 3P+N+G configuration supports balanced three-phase power distribution with neutral and ground, while two auxiliary contacts enable control signaling for connected systems. Rated for continuous operation, the DR250 is ideal for industrial machinery, HVAC systems, data centers, and manufacturing equipment where stable, high-amperage power delivery is critical. Its compact metal construction ensures durability without sacrificing installation flexibility, and the enclosure meets NEMA Type 3R standards for outdoor-rated enclosures. The inlet’s auxiliary contacts allow integration with monitoring systems or interlocks, enhancing operational safety and control. Compatible with standard Size 6 wiring systems, this inlet simplifies high-power connections in facilities requiring compliance with electrical safety codes.
  • 250A rated current for high-power industrial applications
  • 277/480VAC, 60Hz operation with 3P+N+G configuration
  • NEMA Type 3R metal enclosure for outdoor and harsh environments
  • Size 6 inlet with two auxiliary contacts for control signaling
  • Compact, durable design for reliable long-term performance

Specifications

Current Rating
250 A
Frequency
60 Hz
Material
Metal
NEMA Rating
Type 3R
Poles
3P+N+G
Series
DR250
Size
Size 6
Voltage Rating
277/480 VAC

Frequently Asked Questions about Meltric

What certifications and standards do Meltric products comply with?

Meltric products are rigorously certified and comply with multiple critical industrial standards, including UL 2682, UL 508, UL 98, UL 1682, and CSA 22.2 No. 182.1. Their devices are UL and CSA listed with comprehensive ratings covering electrical endurance, short circuit withstand capabilities, motor circuit disconnect switching, and environmental protection standards like Type 4X/IP69/IP69K. Specific certifications include switch-rated plug and receptacle listings that exceed standard industry requirements.

What are the key features of Meltric products?

Meltric products feature advanced safety and reliability technologies, including spring-assisted terminals, push-button circuit disconnection, enclosed arc chambers, and integrated lockout-tagout capabilities. Key innovations include silver-nickel butt-style contacts, a quick-break mechanism that disconnects circuits in 15 milliseconds, and a self-cleaning contact system. Most devices offer modular construction, optional auxiliary contacts, and automatic watertightness, with robust casings made of fiberglass-reinforced thermoplastic polyamide that resist impact and harsh environments.

What environmental ratings do Meltric products have?

Meltric products feature robust environmental ratings, including Type 4X/IP69/IP69K certification, which also meets IP66/IP67 requirements. Their devices are rated to operate in temperatures from -40°F to 140°F, with specific IK ratings for impact resistance ranging from 08 to 10 Joules depending on the product material and model. Metal-cased products typically have higher impact resistance (IK10 with 20 Joules) compared to polymer-based products (IK09 with 10 Joules).

What industries and applications are Meltric products used for?

Meltric products are used across multiple heavy industrial and hazardous environments, including chemical plants, pharmaceutical facilities, oil and gas operations, grain silos, wood processing plants, plastics manufacturing, and wastewater treatment facilities. Their specialized plugs and receptacles are engineered for high-amperage equipment, wet/washdown environments, and locations with explosive gas or dust risks, with specific product lines like DSN and DS Series designed for different industrial applications ranging from 75-100 horsepower equipment.

What technical support does Meltric offer?

Meltric offers comprehensive technical support through multiple channels. Their Customer Service group provides immediate phone support at 800-433-7642, with trained representatives located at their manufacturing facility. Additionally, Meltric's engineering team offers specialized application support, custom design solutions, and can help integrate Meltric and third-party components into power distribution products.

What are the main product lines offered by Meltric?

Meltric offers a comprehensive range of industrial electrical plugs and receptacles across several key product lines: Switch-Rated Plugs & Receptacles (DSN and DS series from 20-200A), Multipin Connectors (6-37 pin, 2-50A), Standard Duty Plugs & Receptacles (DR, PN, DSDC series), High Ampacity Plugs & Receptacles (PF/PFQ, DR400, CS1000, SP series from 300-600A), and specialized options like RETTBOX electromagnetic self-ejection devices and PNHT high-temperature connectors.

What accessories are available for Meltric products?

Meltric offers a comprehensive range of accessories for their industrial plugs and receptacles, including handles, angle adapters, junction boxes, poly conduit entry boxes, finger drawplates, and protective/padlockable inlet/plug caps. These modular accessories allow customers to customize their electrical connection solutions, with options like 30° and 70° angles, metal and poly configurations, and additional features such as auxiliary contacts and locking mechanisms.

How are Meltric products typically installed?

Meltric products are typically installed by inserting the plug into the receptacle with a simple 30-degree clockwise rotation, which latches the connection and energizes the circuit. The installation process is designed for safety, featuring automatic watertight sealing, dead-front safety shutters, and spring-loaded butt-style contacts that ensure optimal electrical performance. For motor change-outs, qualified workers follow a specific procedure including verifying de-energization, applying lockout/tagout, and carefully inserting the plug into the receptacle.

What is Meltric's warranty policy?

Meltric offers a comprehensive 5-year warranty on electrical contacts for all its plug and receptacle products. This warranty reflects the company's confidence in the durability and high-quality design of their electrical components, which are engineered to provide superior performance and reliability in industrial applications.