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

3G Electric
BUSSMANN DFJ-400 Fast-Acting Bolt-On Fuse, Class J, 400 A, 600 V AC, 450 V DC - Fast-Acting Bolt-On Fuses
BUSSMANNFast-Acting Bolt-On Fuses

BUSSMANN DFJ-400 Fast-Acting Bolt-On Fuse, Class J, 400 A, 600 V AC, 450 V DC

The BUSSMANN DFJ Series is a fast-acting, bolt-on fuse with a Class J body, rated at 400 A, 600 V AC, and 450 V DC (MPN DFJ-400). This industrial fuse is designed for overcurrent protection in electrical circuits.

SKU 3G-OTH-25629

Also listed as: DFJ400 · DFJ 400

Brand
BUSSMANN
Item
DFJ-400 Fast-Acting Bolt-On Fuse, Class J, 400 A, 600 V AC, 450 V DC
Part Number
DFJ-400
Category
Fast-Acting Bolt-On Fuses
Available to Order
Also known as:DFJ-400BUSSMANN
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

BUSSMANN
Manufacturer Part Number
DFJ-400
Series
DFJ
Type
Class J, Bolt-On Body, Fast-Acting, 400 A
AC
600 V
DC
450 V

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

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

Product Description

The BUSSMANN DFJ Series is a fast-acting, bolt-on fuse with a Class J body, rated at 400 A, 600 V AC, and 450 V DC (MPN DFJ-400). This industrial fuse is designed for overcurrent protection in electrical circuits.

Frequently Asked Questions

What is the BUSSMANN DFJ-400 fuse used for?

The BUSSMANN DFJ-400 is a fast-acting, bolt-on Class J fuse rated 400 A, 600 V AC, and 450 V DC. It provides overcurrent protection in industrial electrical circuits, such as motor control centers, panelboards, and switchgear, where high interrupting capacity and compact size are required.

What are the specifications of the BUSSMANN DFJ-400 fuse?

The BUSSMANN DFJ-400 is a Class J, bolt-on, fast-acting fuse rated 400 A, 600 V AC, and 450 V DC. It is part of the DFJ Series with manufacturer part number DFJ-400. Its compact body and high interrupting rating make it suitable for protecting branch circuits and equipment.

Where to buy the BUSSMANN DFJ-400 fuse worldwide?

3G Electric supplies the BUSSMANN DFJ-400 fuse worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this Class J, 400 A, 600 V AC fast-acting fuse.

How to select the correct BUSSMANN DFJ-400 fuse for an application?

To select the BUSSMANN DFJ-400, verify your circuit's voltage (600 V AC or 450 V DC max) and continuous current (400 A). Ensure the Class J rejection-style holder matches the bolt-on body. Confirm the fast-acting characteristic suits your load's inrush profile. Consult a qualified engineer for coordination studies.

Used in

Common applications for BUSSMANN
Industrial drives — BUSSMANN FWC series fast-acting cylindrical fuses protect power semiconductors in AC/DC drive circuits.
Control transformers — BUSSMANN FNQ-R series time-delay fuses handle inrush currents in control power circuits.
Semiconductor protection — BUSSMANN KAC series bolt-on fuses safeguard diodes, thyristors, and IGBTs in AC-only applications.
Electrical panels — BUSSMANN FP-2, FP-3, FP-4, and FP-6 fuse pullers enable safe fuse replacement in distribution panels.
Automotive electrical systems — BUSSMANN FP-A3 fuse puller removes and installs 1/4 in and 1/2 in automotive fuses.
Power supplies — BUSSMANN FWC series fuses provide overcurrent protection in AC/DC power supply circuits.
Not sure this is the right part? Photo-identify it

BUSSMANN Products

3G Electric supplies BUSSMANN fast-acting bolt-on fuses. 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 BUSSMANN

View all BUSSMANN parts
Fast-acting bolt-on fuse rated 70 A at 600 V AC, designed for AC-only circuits. Provides overcurrent protection for semiconductor devices such as diodes, thyristors, and IGBTs. Suitable for use in industrial power supplies, motor drives, and UPS systems where rapid fault current interruption is required
BUSSMANN
Fast-acting bolt-on fuse rated 70 A at 600 V AC, designed for AC-only circuits. Provides overcurrent protection for semiconductor devices such as diodes, thyristors, and IGBTs. Suitable for use in industrial power supplies, motor drives, and UPS systems where rapid fault current interruption is required
Fast-acting, non-indicating bolt-on fuse rated 70 A at 250 V AC/DC. Designed for overcurrent protection of power semiconductors in industrial drives, power supplies, and UPS systems
BUSSMANN
Fast-acting, non-indicating bolt-on fuse rated 70 A at 250 V AC/DC. Designed for overcurrent protection of power semiconductors in industrial drives, power supplies, and UPS systems
Class L, KTU Series fast-acting bolt-on fuse rated 1.6 kA, 600 V AC, 340 V DC. Provides overcurrent protection in industrial switchboards, panelboards, and motor control centers requiring high interrupting capacity and fast response
BUSSMANN
Class L, KTU Series fast-acting bolt-on fuse rated 1.6 kA, 600 V AC, 340 V DC. Provides overcurrent protection in industrial switchboards, panelboards, and motor control centers requiring high interrupting capacity and fast response
Fast-acting bolt-on fuse rated 400 A, 700 V AC and 700 V DC. Designed for overcurrent protection of power semiconductors in AC/DC circuits. Typical applications include variable frequency drives, UPS systems, and industrial power supplies
BUSSMANN
Fast-acting bolt-on fuse rated 400 A, 700 V AC and 700 V DC. Designed for overcurrent protection of power semiconductors in AC/DC circuits. Typical applications include variable frequency drives, UPS systems, and industrial power supplies
Fast-acting bolt-on fuse rated 400 A at 500 V AC and 500 V DC. Designed for overcurrent protection in power electronic applications such as variable frequency drives, rectifiers, and UPS systems. Clears faults rapidly to safeguard sensitive semiconductor devices
BUSSMANN
Fast-acting bolt-on fuse rated 400 A at 500 V AC and 500 V DC. Designed for overcurrent protection in power electronic applications such as variable frequency drives, rectifiers, and UPS systems. Clears faults rapidly to safeguard sensitive semiconductor devices

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first