Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

SQUARE D NQ Main Lug - Square D NQ Main Lug, Convertible Panel Interiors
SQUARE DSquare D NQ Main Lug, Convertible Panel Interiors

SQUARE D NQ Main Lug

The Square D NQ Main Lug, Convertible Panel Interior (MPN NQ430L4) is a 30-space, 400 A panelboard interior with an aluminum bus, measuring 45 in Ht by 10 7/16 in Wd. It accepts QHB, QOB, and QOB-VH circuit breakers…

SKU 3G-OTH-772236

Brand
SQUARE D
Item
NQ Main Lug
Category
Square D NQ Main Lug, Convertible Panel Interiors
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

SQUARE D
Manufacturer Part Number
NQ430L4
Type
Aluminum, QHB/QOB/QOB-VH
Wd
10 7/16 in
Ht
45 in
Amps
400 A
Bus Material
Aluminum
Circuit Breaker Series
QOB-VH

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

SQUARE D Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Square D NQ Main Lug, Convertible Panel Interior (MPN NQ430L4) is a 30-space, 400 A panelboard interior with an aluminum bus, measuring 45 in Ht by 10 7/16 in Wd. It accepts QHB, QOB, and QOB-VH circuit breakers, providing a flexible, convertible main-lug configuration for commercial and industrial power distribution.

Frequently Asked Questions

What is the Square D NQ430L4 panelboard interior used for?

The Square D NQ430L4 panelboard interior distributes power in commercial and industrial electrical systems. It accepts QHB, QOB, and QOB-VH circuit breakers in a convertible main-lug configuration, supporting up to 400 A with an aluminum bus for reliable branch-circuit protection.

What are the specifications of the Square D NQ430L4?

The Square D NQ430L4 panelboard interior has 30 spaces, 400 A rating, aluminum bus material, and accepts QHB, QOB, and QOB-VH breakers. Dimensions are 45 in Ht by 10 7/16 in Wd. It is a convertible main-lug type for flexible power distribution.

Where to buy Square D NQ430L4 worldwide?

3G Electric supplies the Square D NQ430L4 panelboard interior worldwide. We handle full logistics, customs clearance, and delivery to your site. As a global industrial solutions provider, we source genuine Square D equipment and support your project from quote to delivery.

How to select the right Square D panelboard interior?

Select a Square D panelboard interior by matching the ampere rating (400 A for NQ430L4), number of spaces (30), bus material (aluminum), and breaker compatibility (QHB, QOB, QOB-VH). Verify dimensions fit your enclosure and that the main-lug or main-breaker configuration meets your distribution needs.

Used in

Common applications for SQUARE D
Commercial building electrical panels — Square D QO series plug-in circuit breakers for branch circuit protection
Industrial motor control centers — Square D QOB series bolt-on breakers in NQOD panelboards
Heating equipment installations — Square D QOU series unit-mount breakers for overcurrent protection
Outdoor electrical distribution — Square D L-Frame enclosures housing LAL/LHL breakers for 400 A service
Indoor facility power distribution — Square D Q-Frame enclosures with QBL/QDL breakers for 225 A circuits
Retrofit and replacement in existing Square D load centers — QO series breakers for 120/240V AC systems
Not sure this is the right part? Photo-identify it

SQUARE D Products

3G Electric supplies SQUARE D square d nq main lug, convertible panel interiors. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

More from SQUARE D

View all SQUARE D parts
This 600 A main lug convertible panel interior features a copper bus and accepts QHB, QOB, and QOB-VH circuit breakers. It provides 42 spaces for circuit distribution in commercial and industrial electrical systems. Dimensions: 45 in height, 10 7/16 in width
SQUARE D
This 600 A main lug convertible panel interior features a copper bus and accepts QHB, QOB, and QOB-VH circuit breakers. It provides 42 spaces for circuit distribution in commercial and industrial electrical systems. Dimensions: 45 in height, 10 7/16 in width
This 225 A main lug convertible panel interior features a copper bus and accommodates QHB, QOB, and QOB-VH circuit breakers. With 30 spaces and dimensions of 27 in height by 10 7/16 in width, it is used in electrical distribution systems for branch circuit wiring
SQUARE D
This 225 A main lug convertible panel interior features a copper bus and accommodates QHB, QOB, and QOB-VH circuit breakers. With 30 spaces and dimensions of 27 in height by 10 7/16 in width, it is used in electrical distribution systems for branch circuit wiring
This 100 A main lug convertible panel interior provides 18 spaces for branch-circuit distribution. It accepts QHB, QOB, and QOB-VH circuit breakers and features an aluminum bus. Dimensions are 21 in height by 10 7/16 in width. Suitable for use in commercial and industrial electrical systems
SQUARE D
This 100 A main lug convertible panel interior provides 18 spaces for branch-circuit distribution. It accepts QHB, QOB, and QOB-VH circuit breakers and features an aluminum bus. Dimensions are 21 in height by 10 7/16 in width. Suitable for use in commercial and industrial electrical systems
This 100 A main lug convertible panel interior is designed for use in commercial and industrial electrical distribution systems. It features an aluminum bus and accommodates up to 18 spaces for QHB, QOB, or QOB-VH circuit breakers. Dimensions: 27 in height, 10 7/16 in width
SQUARE D
This 100 A main lug convertible panel interior is designed for use in commercial and industrial electrical distribution systems. It features an aluminum bus and accommodates up to 18 spaces for QHB, QOB, or QOB-VH circuit breakers. Dimensions: 27 in height, 10 7/16 in width
This 225 A, 42-space convertible panel interior features a copper bus and is compatible with QHB, QOB, and QOB-VH circuit breakers. It measures 33 inches in height and 10 7/16 inches in width. Suitable for use in electrical distribution systems where main lug configuration is required
SQUARE D
This 225 A, 42-space convertible panel interior features a copper bus and is compatible with QHB, QOB, and QOB-VH circuit breakers. It measures 33 inches in height and 10 7/16 inches in width. Suitable for use in electrical distribution systems where main lug configuration is required
This 225 A main lug convertible panel interior features a copper bus and accepts QHB, QOB, and QOB-VH circuit breakers. It measures 27 inches in height and 10 7/16 inches in width, providing 30 spaces for branch circuit breakers in electrical distribution systems
SQUARE D
This 225 A main lug convertible panel interior features a copper bus and accepts QHB, QOB, and QOB-VH circuit breakers. It measures 27 inches in height and 10 7/16 inches in width, providing 30 spaces for branch circuit breakers in electrical distribution systems
This Square D NQ main lug convertible panel interior is rated 225 A with an aluminum bus. It accommodates QHB, QOB, and QOB-VH circuit breakers in a 42-space configuration. Measuring 33 inches high by 10 7/16 inches wide, it is used for power distribution in commercial and industrial electrical systems
SQUARE D
This Square D NQ main lug convertible panel interior is rated 225 A with an aluminum bus. It accommodates QHB, QOB, and QOB-VH circuit breakers in a 42-space configuration. Measuring 33 inches high by 10 7/16 inches wide, it is used for power distribution in commercial and industrial electrical systems
This NQ series main lug convertible panel interior is rated 600 A and features a copper bus. It accommodates QHB, QOB, and QOB-VH circuit breakers in 30 spaces. Measuring 45 inches high by 10 7/16 inches wide, it is used in electrical distribution systems for commercial or industrial power distribution
SQUARE D
This NQ series main lug convertible panel interior is rated 600 A and features a copper bus. It accommodates QHB, QOB, and QOB-VH circuit breakers in 30 spaces. Measuring 45 inches high by 10 7/16 inches wide, it is used in electrical distribution systems for commercial or industrial power distribution