Mersen EHFBJ4003RP0 - Mersen Enclosed Disconnect Switches are designed to meet customer's requirements for compact and durable individual disconnecting means. Both fusible and non-fusible versions are available in a variety of enclosure types. Mersen features NEMA 4X non-metallic enclosures that are extremely durable and provide the ultimate protection for harsh environments and conditions. The enclosed disconnect switch range offers safety, ease of installation, space savings and operational convenience to end-users. 400 amp J FDS disconnect with black pistol handle in a NEMA 4 enclosure.
Mersen

EHFBJ4003RP0

Alternate Item Number: 782001371944

UPC: 782001371944

Contact for Pricing

Overview

The **Mersen EHFBJ4003RP0 400A Enclosed Disconnect Switch** is a high-performance industrial solution engineered for reliability, safety, and durability in demanding environments. Designed by Mersen, a global leader in electrical protection and power management, this enclosed disconnect switch combines robust construction with advanced functionality to meet the rigorous demands of modern industrial applications. Whether deployed in manufacturing plants, chemical processing facilities, water treatment centers, or renewable energy installations, this switch delivers uncompromising performance where operational continuity and equipment protection are critical. At the core of its design is a **400-ampere current rating**, ensuring it can safely handle high-load industrial circuits while providing a reliable means of isolation for maintenance, emergency shutdowns, or system reconfiguration. The **NEMA 4X non-metallic enclosure** is a standout feature, offering exceptional resistance to corrosion, moisture, dust, and chemical exposure—making it ideal for outdoor installations or harsh indoor environments. Unlike traditional metallic enclosures, the non-metallic construction eliminates the risk of rust and galvanic corrosion, significantly extending service life and reducing maintenance costs. Available in both **fusible and non-fusible versions**, the Mersen EHFBJ4003RP0 provides flexibility to match specific application requirements. Fusible models integrate overcurrent protection directly into the switch, simplifying panel design and reducing component count, while non-fusible versions offer a streamlined disconnect solution for circuits already protected by upstream devices. This versatility allows engineers and facility managers to optimize system architecture based on load characteristics, safety protocols, and compliance needs. The **black pistol-grip handle** enhances operational convenience, enabling quick and intuitive actuation even when wearing gloves—a common requirement in industrial settings. The ergonomic design reduces operator fatigue and minimizes the risk of accidental engagement or disengagement, improving overall workplace safety. Installation is straightforward thanks to the **compact footprint** and standardized mounting configurations, which support both wall-mounted and panel-mounted applications. This space-saving design is particularly valuable in retrofit projects or facilities where panel real estate is at a premium. Mersen’s reputation for engineering excellence is reflected in every aspect of the EHFBJ4003RP0. As a trusted partner to industries ranging from oil and gas to food processing, Mersen has built a legacy of delivering products that meet or exceed stringent safety and performance standards, including UL, CSA, and IEC certifications. The enclosed disconnect switch line is backed by comprehensive technical support, ensuring seamless integration into existing systems and adherence to local electrical codes. Ideal for **emergency stop systems, motor control centers, HVAC distribution panels, and renewable energy inverters**, this switch provides a critical layer of protection and control. Its ability to withstand extreme temperatures, UV exposure, and high humidity makes it a preferred choice for outdoor substations, solar farms, and coastal installations. By choosing the Mersen EHFBJ4003RP0, facility managers gain peace of mind knowing they’ve selected a product engineered for longevity, compliance, and operational resilience—backed by a manufacturer with over a century of innovation in electrical protection technology.
  • 400A current rating for high-load industrial circuits
  • NEMA 4X non-metallic enclosure resists corrosion, moisture, and chemicals
  • Available in fusible and non-fusible versions for flexible protection
  • Black pistol-grip handle for ergonomic, glove-friendly operation
  • Compact design optimizes space in panel and wall-mounted installations

Specifications

Amperage Rating
400 A
Application
Load break switching Separate disconnect means within sight of all motor loads to comply with NEC® Article 430 Circuit isolation Service entrance ratings available Food processing Conveyor systems Harsh industrial environments
Brand Name
Ferraz Shawmut
Color
Black
Current Rating
400 A
Enclosure
NEMA 4
Material
Non-Metallic
Mounting
Screw
Nema Rating
NEMA 4X
Number Of Poles
3
Special Features
Suitable for use as Motor Disconnect Meets OSHA lockout/tagout requirements NEMA rated enclosures Knockouts provided Easy screw mounting Selector or pistol handles in black or red/yellow
Standard
UL 508A UL508 UL98 CSA IEC versions available.
Type
Enclosed Disconnect Switch
Voltage Rating
600 V
Combine high performance with compact dimensions: - 1000 V AC / DC IEC 600 V UL, - Opt for the best marking visibility thanks to the up-front, flat marker zone, which lets you mark up to eight digits or increase the font size.

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Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.