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SQUARE D N250MJ Panelboard Main Breaker Kit - Square D Main Breaker Kits
SQUARE DSquare D Main Breaker Kits

SQUARE D N250MJ Panelboard Main Breaker Kit

The Square D N250MJ Panelboard Main Breaker Kit is a 250 Amp, three-phase accessory for Square D J-Frame Panelboards. It includes (2) Rail Extensions and is compatible with the JRL circuit breaker series, with a…

SKU 3G-OTH-722193

Brand
SQUARE D
Item
N250MJ Panelboard Main Breaker Kit
Part Number
N250MJ
Category
Square D Main Breaker Kits
Available to Order
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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
N250MJ
Type
For Use With Square D J-Frame Panelboards
Amps
250
Phase
Three
Includes
(2) Rail Extension
Frame Size
225A/J
For Use With
Square D J-Frame Panelboards
Accessory Type
Panelboard Main Breaker Kit
Compatible Circuit Breaker Series
JRL

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

Product Description

The Square D N250MJ Panelboard Main Breaker Kit is a 250 Amp, three-phase accessory for Square D J-Frame Panelboards. It includes (2) Rail Extensions and is compatible with the JRL circuit breaker series, with a 225A/J frame size.

Frequently Asked Questions

What is the Square D N250MJ Panelboard Main Breaker Kit used for?

The Square D N250MJ Panelboard Main Breaker Kit is used to add a 250 Amp, three-phase main breaker to Square D J-Frame Panelboards. It is compatible with the JRL circuit breaker series and includes (2) Rail Extensions for secure mounting in industrial electrical distribution systems.

What are the specifications of the Square D N250MJ Panelboard Main Breaker Kit?

The Square D N250MJ Panelboard Main Breaker Kit is rated for 250 Amps, three-phase, with a 225A/J frame size. It is designed for use with Square D J-Frame Panelboards and is compatible with the JRL circuit breaker series. The kit includes (2) Rail Extensions.

Where to buy the Square D N250MJ Panelboard Main Breaker Kit worldwide?

3G Electric supplies the Square D N250MJ Panelboard Main Breaker Kit worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver this Square D accessory to your facility. Contact us for availability and delivery to your location.

How to install the Square D N250MJ Panelboard Main Breaker Kit?

Installation of the Square D N250MJ Panelboard Main Breaker Kit should follow Square D guidelines for J-Frame Panelboards. Ensure power is off, mount the kit using the included (2) Rail Extensions, and connect the JRL series breaker. Always consult a qualified electrician and refer to the manufacturer's instructions.

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
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SQUARE D Products

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

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Compatible alternatives & equivalents

Cross-referenced by specification & description
The SQUARE D JGA36225 is a 225 A, 3-pole molded case circuit breaker with a 25kA at 240V AC interrupting rating. It features instantaneous trip response and line/load lug terminals with ABC phase connection. Part of the JG series, it is used for overcurrent protection in panelboards and switchboards within industrial and commercial power distribution systems
SQUARE D
The SQUARE D JGA36225 is a 225 A, 3-pole molded case circuit breaker with a 25kA at 240V AC interrupting rating. It features instantaneous trip response and line/load lug terminals with ABC phase connection. Part of the JG series, it is used for overcurrent protection in panelboards and switchboards within industrial and commercial power distribution systems
J-Frame molded case circuit breaker from the JG Series, rated 150 A with a maximum interrupting rating of 25kA at 240V AC. Features adjustable instantaneous trip, lug terminal connections, and ABC phase connection. Low amp trip setting is 750 A. Suitable for overcurrent protection in industrial power distribution panels, motor control centers, and switchboards
SQUARE D
J-Frame molded case circuit breaker from the JG Series, rated 150 A with a maximum interrupting rating of 25kA at 240V AC. Features adjustable instantaneous trip, lug terminal connections, and ABC phase connection. Low amp trip setting is 750 A. Suitable for overcurrent protection in industrial power distribution panels, motor control centers, and switchboards
The SQUARE D CU250JD is a kit containing three copper mechanical lugs rated at 250 A and 600V AC. Designed for use with Powerpact J Frame circuit breakers, these lugs are used to terminate copper conductors in industrial power distribution and panelboard applications requiring secure, high-ampacity connections
SQUARE D
The SQUARE D CU250JD is a kit containing three copper mechanical lugs rated at 250 A and 600V AC. Designed for use with Powerpact J Frame circuit breakers, these lugs are used to terminate copper conductors in industrial power distribution and panelboard applications requiring secure, high-ampacity connections

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