nVent TB3R403 - Terminal Box 3-Phase Type 3R, 27.00x16.00x5.00, Gray, Steel
nVent

TB3R403

UPC: 783510144487

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Overview

The nVent TB3R403 (SKU: TB3R403) is a 400 Amp, 600 Volt, 3-phase Type 3R terminal box designed for outdoor commercial and industrial feeder tap to branch circuit applications. Constructed from 16-gauge galvanized steel with an ANSI 61 gray polyester powder paint finish, this enclosure offers robust protection against rain, sleet, and external ice formation, meeting NEMA/EEMAC Type 3R and IEC 60529 IP32 standards. Its dimensions are 27.00 x 16.00 x 5.00 inches (686 x 406 x 127 mm). The design features a drip-shield top, seam-free sides, front, and back for enhanced water ingress protection. A removable cover facilitates easy access for installation and maintenance, with provisions for padlocking or sealing for added security. Pre-installed distribution lugs support three- or four-wire configurations, accommodating wire ranges from #4 AWG to 600 MCM. A hub opening at the top includes a cover for conduit entry, and knockouts on the bottom provide flexible wiring pathways. Grounding provisions are integrated for system integrity. This terminal box is UL 1773, UL 50/50E listed, and cUL certified to CSA C22.2 No. 94, ensuring compliance with industry safety regulations. Ideal for utility substations, renewable energy sites, and manufacturing facilities requiring reliable outdoor electrical distribution.
  • Grounding provisions
  • Hub opening at top with cover
  • Provisions for padlocking or seal
  • Distribution lugs installed (see table for sizes)
  • Knockouts on bottom of enclosure
  • Removable cover
  • Drip-shield top and seam-free sides, front and back
  • Terminal Boxes are finished with paint over plated surfaces

Specifications

Amps
400 A
Application
Power Distribution
Bar Quantity
4
Color
Gray
Color Code
ANSI 61
Current
400-400 A
Current Rating
400 A
Depth
13 IN
Depth
6
Depth
152
Finish
Galvanized
Height
44 IN
Height
27
Height
686
IP Rating
IP32
Material
Mild Steel;Steel
Material
Mild Steel
Material
Steel
Modification Services
Yes
NEMA Rating
Type 3R
NEMA Rating
3R Weather-resistant, except dust
NEMA Rating
3r
Number of Phases
3 Ph
Phase
3Ø Ph
Poles
3-Phase
Protection Rating
NEMA Type 3R
Size
27.00x16.00x5.00 in
Size
27.00x16.00x5.00
Thickness
16 ga
Thickness
1.52 mm
Thickness
51.40mm (2.024")
Type
Utility Cabinets
Type
Utility / Canadian Cabinets and Splitters
Type Number
Type 3R
Voltage AC
600 V
Weight
40 lb
Width
20.5
Width
521
Width
23 IN
Wire Range
(6) #4-600MCM kcmil
Wire Size
(6) #4 - 600 MCM
Package Dimensions (L x W x H)
31 IN x 24 IN x 7.25 IN
Package Dimensions (L x W x H)
78.74 cm x 60.96 cm x 18.415 cm
Package Weight (Imperial)
40.000 L
Package Weight (Metric)
18.144 kg
Terminal Box 1-Phase Type 3R, 27.00x16.00x5.00, Gray, Steel

TB3R401

Terminal Box 1-Phase Type 3R, 27.00x16.00x5.00, Gray, Steel

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.