Mersen ECFBJ4003RP0 - 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 red pistol handle in a NEMA 12 enclosure.
Mersen

ECFBJ4003RP0

Alternate Item Number: 782001370657

UPC: 782001370657

Contact for Pricing

Overview

The **Mersen ECFBJ4003RP0 400A Enclosed Disconnect Switch** is a high-performance industrial solution designed to deliver reliable power isolation in demanding environments. Engineered by Mersen, a global leader in electrical protection and power management, this enclosed disconnect switch combines robust construction with operational convenience to meet the rigorous demands of modern industrial applications. The **ECFBJ4003RP0** features a **400 amp current rating**, ensuring it can handle high-load scenarios common in manufacturing, processing, and utility installations. Its **NEMA 12 non-metallic enclosure** provides superior protection against dust, dirt, and non-corrosive liquids, making it ideal for indoor environments where exposure to contaminants is a concern. **Key Features and Benefits:** - **Durable NEMA 12 Enclosure:** The non-metallic construction resists corrosion, UV exposure, and mechanical stress, ensuring long-term reliability in harsh or corrosive conditions. Unlike metallic enclosures, it eliminates the risk of rust and electrical grounding issues, enhancing safety and longevity. - **400A Current Rating:** Suitable for high-power industrial applications, this disconnect switch can safely interrupt circuits under full load, providing a critical safety function in power distribution systems. It is ideal for use in motor control centers, panelboards, and branch circuit protection. - **Red Pistol Handle:** The ergonomic red handle offers clear visual identification and easy operation, even when wearing gloves. The quick-break mechanism ensures rapid disconnection, reducing arc flash risk and improving workplace safety. - **Compact and Space-Saving Design:** Designed for efficient installation in tight spaces, the ECFBJ4003RP0 reduces panel footprint requirements without compromising performance. This is particularly valuable in retrofits or upgrades where space is at a premium. - **Versatile Configurations:** Available in both **fusible and non-fusible versions**, the ECFBJ4003RP0 can be tailored to specific application needs. Fusible models provide overcurrent protection, while non-fusible versions offer simple disconnect functionality for maintenance or emergency shutdowns. **Industry Applications:** The Mersen ECFBJ4003RP0 is widely used across multiple industries, including: - **Manufacturing:** Provides safe isolation for machinery in automotive, food processing, and textile plants. - **Oil & Gas:** Suitable for use in hazardous locations where corrosion resistance and durability are essential. - **Water/Wastewater Treatment:** Handles exposure to moisture and chemicals while ensuring reliable operation. - **Renewable Energy:** Ideal for solar and wind farm installations, where environmental resilience and safety are paramount. - **Commercial Buildings:** Used in HVAC systems, lighting controls, and backup power systems to ensure safe maintenance access. **Why Choose Mersen?** Mersen has been a trusted name in electrical protection for over a century, known for innovation and quality in circuit protection, busways, and disconnect solutions. The ECFBJ4003RP0 reflects Mersen’s commitment to **safety, reliability, and ease of use**, with features that simplify installation and maintenance. Certified to meet industry standards, this disconnect switch is built to withstand the rigors of industrial use while providing peace of mind for facility managers and electricians. **Installation and Maintenance Considerations:** Professionals appreciate the ECFBJ4003RP0 for its straightforward installation process. The NEMA 12 enclosure allows for wall-mounting or panel integration, and the clear labeling ensures compliance with electrical codes. Routine maintenance is minimal, thanks to the switch’s sealed design and durable materials. For optimal performance, ensure proper sizing based on load requirements and environmental conditions. **Conclusion:** The **Mersen ECFBJ4003RP0 400A Enclosed Disconnect Switch** is more than just a power isolation device—it’s a critical component in any industrial safety strategy. With its **high durability, ease of operation, and versatile configurations**, it addresses the needs of engineers, electricians, and facility managers who demand reliability without compromise. Whether for new installations or system upgrades, this switch delivers the performance and protection required in today’s industrial landscape.
  • 400A current rating for high-load industrial applications
  • NEMA 12 non-metallic enclosure resists corrosion and contaminants
  • Red pistol handle ensures quick, safe disconnection
  • Available in fusible and non-fusible versions for versatile protection
  • Compact design saves space in panel 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
Red
Current Rating
400 A
Enclosure
NEMA 12
Material
Non-Metallic
Mounting
Screw
Nema Rating
NEMA 12
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.

1SNK705010R0000

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.
HPS Open Style Control Transformer, 150VA 240x480V-120x240V 50/60Hz

C2G0150MQMJ

HPS Open Style Control Transformer, 150VA 240x480V-120x240V 50/60Hz
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
BK63H 1P B2A 10kA 120/240VAC UL1077

0626030563

BK63H 1P B2A 10kA 120/240VAC UL1077
GMD-16M DC240V 3W 1b EXP (GMD16M-30-01-UD-3W-S-E)

1270040900

GMD-16M DC240V 3W 1b EXP (GMD16M-30-01-UD-3W-S-E)
ACS380 AC Drive, 3-380-480V In, 3HP, 6A, Type OPEN, 1.5 overload, Integrated, HxWxD 6.69x2.76x7.52 in, Module

ACS380-040S-07A2-4

ACS380 AC Drive, 3-380-480V In, 3HP, 6A, Type OPEN, 1.5 overload, Integrated, HxWxD 6.69x2.76x7.52 in, Module
C.BREAKER TMAX XT2N 125 UL/CSA FIXED THREE-POLE WITH FRONT TERMINALS AND THERMOMAGNETIC RELEASE TMA R 90 I3=450...900 A

XT2NU3090BFF000XXX

C.BREAKER TMAX XT2N 125 UL/CSA FIXED THREE-POLE WITH FRONT TERMINALS AND THERMOMAGNETIC RELEASE TMA R 90 I3=450...900 A
Pushbuttons. 104P heavy duty Oiltight Pushbutton. Nameplate. XN1B PR.No. CR100699

CR104PXN1B

Pushbuttons. 104P heavy duty Oiltight Pushbutton. Nameplate. XN1B PR.No. CR100699
MC-50a AC120V 50/60Hz SCREW 1a1b (Metasol) EXP (MC50A-30-11-K7-S-E)

1338006700

MC-50a AC120V 50/60Hz SCREW 1a1b (Metasol) EXP (MC50A-30-11-K7-S-E)
N3 SCREW COVER - 10X10X6 - GRA

C3SC10106GY

N3 SCREW COVER - 10X10X6 - GRA
The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.

NNC75X75WH2

The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.
General Electric Control Products. Nema Power Devices. Ol Relay 610F8364

CR324E610F

General Electric Control Products. Nema Power Devices. Ol Relay 610F8364

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.