Authorized nVent Distributor
nVent MB050503PS - MultiBox Opaque Screw Cover Type 4X, 5.11x5.11x2.95, Lt Gray, Polystyrene, PS

nVent MB050503PS MultiBox Opaque Screw Cover Type 4X, 5.11x5.11x2.95, Lt Gray, Polystyrene, PS

UPC: 635394599450

Documents & Media
Installation Instructions

Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The nVent MultiBox Opaque Screw Cover Type 4X (SKU: MB050503PS) is a high-performance polystyrene enclosure designed for demanding industrial environments where corrosion resistance, durability, and protection are critical. Engineered by nVent, a global leader in electrical and thermal management solutions, this enclosure provides a robust solution for housing sensitive electrical components, instrumentation, and control systems in highly corrosive or hazardous locations. With a Type 4X rating, the MB050503PS ensures protection against dust, water ingress, and corrosion, making it ideal for outdoor installations, chemical processing plants, wastewater treatment facilities, and marine applications where exposure to moisture, chemicals, or extreme weather is a constant challenge. Constructed from durable polystyrene (PS), this MultiBox enclosure offers exceptional chemical resistance against a wide range of corrosive substances, including acids, alkalis, and solvents. The opaque screw cover design enhances security and prevents unauthorized access while maintaining a lightweight yet rugged structure. Measuring 5.11 inches in width, depth, and height (5.11x5.11x2.95), the MB050503PS is compact enough for space-constrained installations but spacious enough to accommodate essential electrical components, terminal blocks, or instrumentation. The light gray finish not only provides a professional appearance but also resists UV degradation, ensuring long-term performance in outdoor applications. Professionals across industries such as oil and gas, mining, food and beverage, pharmaceuticals, and renewable energy rely on nVent MultiBox enclosures for their reliability and compliance with stringent safety standards. The Type 4X rating confirms compliance with NEMA and IP standards, ensuring protection against hose-directed water, falling dirt, and corrosive atmospheres. Installation is straightforward, with pre-drilled mounting holes and a secure screw cover that minimizes the risk of tampering or environmental intrusion. For engineers and contractors, the MB050503PS represents a cost-effective solution that reduces downtime and maintenance costs by providing long-lasting protection for critical electrical systems. nVent’s reputation for innovation and quality in electrical enclosures is unmatched, with decades of experience in developing solutions that meet the evolving needs of industrial applications. The MultiBox series, including the MB050503PS, is trusted by professionals worldwide for its durability, compliance, and ease of integration into existing systems. Whether used as a junction box, instrumentation enclosure, or control panel housing, this product delivers the performance and protection required in the most challenging environments. For projects where reliability and corrosion resistance are non-negotiable, the nVent MultiBox Opaque Screw Cover Type 4X is the smart choice for safeguarding electrical infrastructure.
  • Type 4X rated for protection against dust, water, and corrosion
  • Constructed from durable polystyrene (PS) with chemical resistance
  • Compact 5.11x5.11x2.95 inch dimensions with light gray finish
  • Opaque screw cover design for security and tamper resistance
  • Ideal for outdoor, chemical, marine, and industrial applications
  • All enclosures can be easily modified to customer specifications

Specifications

Application
Corrosive Environments; Controls and Drives
Color
Light Gray
Finish
Smooth Matte
Ip Rating
IP66/IP67
Material
Polystyrene
Nema Rating
Type 4X
Series
MultiBox
Size
5.11x5.11x2.95 in
Type
Fiberglass and Thermoplastic Wall Mounted Industrial Enclosures
Panel 6.9 x 4.9 - Fits Encl. 8 x 6 - Alum

14A0705

Panel 6.9 x 4.9 - Fits Encl. 8 x 6 - Alum
Sealable and transparent protective covers BX4 and non-removable BX4-CA to protect the devices against accidental contact.

BX4

Sealable and transparent protective covers BX4 and non-removable BX4-CA to protect the devices against accidental contact.
Cord Grip with NPT Threads, Locknut Included, NPT Thread Size 3/8 Inch, Cable Range 0.181 Inch/4.6mm to 0.312 Inch/7.9mm, Hole Clearance 0.670 Inch/17.0mm, Thread Length 0.53 Inch/13.5mm, IP68 Rating, Nylon, Black

LH38

Cord Grip with NPT Threads, Locknut Included, NPT Thread Size 3/8 Inch, Cable Range 0.181 Inch/4.6mm to 0.312 Inch/7.9mm, Hole Clearance 0.670 Inch/17.0mm, Thread Length 0.53 Inch/13.5mm, IP68 Rating, Nylon, Black
EP-RJG-M20-BL-A

1SNG618003R0000

EP-RJG-M20-BL-A
1/2 Inch, Straight, One-Piece Liquidtight Non-Metallic Fitting, CSA, UL E32447, Temperatures up to 60 Degrees C, PVC, Grey

LN43DA

1/2 Inch, Straight, One-Piece Liquidtight Non-Metallic Fitting, CSA, UL E32447, Temperatures up to 60 Degrees C, PVC, Grey
1/2 Inch, 90 Degree, Two-Piece Liquidtight Non-Metallic Fitting, UL E32447, Temperatures up to 107 Degrees C, Nitril Rubber O-Ring, PVC, Grey

LT20D-NEW

1/2 Inch, 90 Degree, Two-Piece Liquidtight Non-Metallic Fitting, UL E32447, Temperatures up to 107 Degrees C, Nitril Rubber O-Ring, PVC, Grey
External operation handle 0-1 type S01 Red Nema 4,4x

140E2911

External operation handle 0-1 type S01 Red Nema 4,4x
Escutcheon black type B for Sircover 125-630A

44095015

Escutcheon black type B for Sircover 125-630A
12,80" x 12,80" filter fan - 115Vac - 285.3 cfm - RAL 7035 - Type 12

FF20A115UE1

12,80" x 12,80" filter fan - 115Vac - 285.3 cfm - RAL 7035 - Type 12
5,90" x 5,90" filter fan - 24Vdc - 20.6 cfm - RAL 9005 - Type 3R - IP55

FF12D24NN53

5,90" x 5,90" filter fan - 24Vdc - 20.6 cfm - RAL 9005 - Type 3R - IP55

How to Install the MB050503PS Multibox Enclosure

Guide for installing and preparing the MB050503PS Multibox series enclosure for use as an electrical junction or instrumentation enclosure.

Estimated time: 30m

Tools needed:

Screwdriver, Drill (if mounting holes are needed), Wire strippers, Pliers

Supplies needed:

Mounting hardware (screws, anchors), Grommets or conduit fittings (if using knockouts), Wire connectors

  1. Select Mounting Location

    Choose a suitable location for the MB050503PS enclosure. Consider environmental factors and accessibility. Refer to the datasheet for specific temperature and environmental ratings applicable to your model.

  2. Prepare Enclosure (if necessary)

    If using a model with knockouts (PCK, PSK, PCCTK, PSCTK), select the appropriate knockout locations for cable entry. Remove the knockouts using appropriate tools. Install grommets or conduit fittings as needed. For models without knockouts, plan your cable entry points.

  3. Mount the Enclosure

    Securely mount the MB050503PS enclosure to the desired surface using appropriate mounting hardware. Ensure the enclosure is level and firmly attached. For specific mounting instructions or back plate compatibility, refer to the product's datasheet.

  4. Install Internal Components (if applicable)

    If you are installing internal components such as back plates (e.g., MBBP series), do so now according to their specific instructions. Ensure any internal components are compatible with the enclosure size and type.

  5. Route Wiring

    Carefully route all necessary wiring into the enclosure through the prepared openings or knockouts. Use appropriate cable glands or fittings to maintain the enclosure's integrity.

  6. Connect Wiring

    Make all necessary electrical connections inside the enclosure using appropriate wire connectors. Ensure all connections are secure and comply with relevant electrical codes. Refer to any specific wiring diagrams or datasheets for your application.

  7. Close and Secure the Enclosure

    Ensure all internal wiring is properly managed and does not interfere with the gasket. Close the cover of the MB050503PS enclosure and securely fasten the corner screws. Verify that the gasket provides a continuous seal.

Frequently Asked Questions about nVent

What industries and applications are nVent products used for?

nVent products are engineered for critical infrastructure and industrial applications across multiple demanding sectors. Key markets include Construction, Data Centers, Defense, Healthcare, Mining, Oil & Gas Refineries, Power Plants, Rail/Transit, Renewable Energy, Security, Ship Building, Steel Mills, Telecom, and Utilities. Their solutions are designed to withstand extreme environmental conditions, with temperature ranges from -55°C to 105°C and specialized features like UV resistance, oil resistance, and flame resistance.

What environmental ratings do nVent products have?

nVent enclosures feature comprehensive environmental ratings, including UL 508A, CSA, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13 certifications. They are rated IEC 60529 IP66, providing robust protection against dust, water, and corrosion in both indoor and outdoor environments. These products operate effectively in temperatures ranging from -40°F to 266°F, with enhanced UV inhibitors for outdoor weathering and oil-resistant gaskets for superior sealing.

What accessories are available for nVent products?

nVent offers a comprehensive range of accessories across multiple product lines, including EMC accessories like bonding cable clamps and strain reliefs, inline accessories such as lock inserts and mounting brackets, CONCEPT accessories including panel conversion kits and rack-mount angles, and seismic accessories for specialized mounting requirements. Key accessory categories include grounding kits, DIN rail mounting solutions, panel supports, handles, and various mounting hardware compatible with different enclosure types.

What certifications and standards do nVent products comply with?

nVent products meet critical international certifications including UL (United States), CSA (Canada), CE (European Community), and EAC (Russia). Our products are designed to comply with rigorous industrial standards such as NEMA enclosure ratings, IEC 60529 IP ratings, and international safety standards across multiple industrial markets including oil & gas, power, manufacturing, and infrastructure.

What is nVent's warranty policy?

nVent offers a standard 18-month warranty from invoicing date for most automation products, covering defects in workmanship and materials. The warranty requires proper transportation, handling, storage, and installation within specified environmental conditions. Warranty coverage includes repair or replacement at nVent's discretion, with certain conditions such as authorized service repairs and operation within designed capacity limits.

What technical support does nVent offer?

nVent offers comprehensive technical support through multiple global contact centers across North America, South America, Europe, Middle East, India, and Asia. Customers can reach technical experts by phone at regional numbers, with the North American headquarters in Minneapolis, MN providing primary support at +1.763.421.2240. Additionally, nVent provides online support resources through their website, including CAD drawing downloads and an 'Ask The Expert' feature to assist with product technical inquiries.