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MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 400 A, 600 V AC - Time-Delay Bolt-On Fuses
MERSENTime-Delay Bolt-On Fuses

MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 400 A, 600 V AC

The MERSEN A4BQ Series Class L Time-Delay Bolt-On Fuse (MPN A4BQ400) is a 400 A, 600 V AC, 500 V DC industrial fuse with a bolt-on body. It provides time-delay overload protection for high-current circuits.

SKU 3G-OTH-27718

Brand
MERSEN
Item
Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 400 A, 600 V AC
Category
Time-Delay Bolt-On Fuses
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Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

MERSEN
Manufacturer Part Number
A4BQ400
Series
A4BQ
Type
A4BQ Series, Bolt-On Body, Time-Delay, 400 A
AC
600 V
DC
500 V

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

Product Description

The MERSEN A4BQ Series Class L Time-Delay Bolt-On Fuse (MPN A4BQ400) is a 400 A, 600 V AC, 500 V DC industrial fuse with a bolt-on body. It provides time-delay overload protection for high-current circuits.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the MERSEN A4BQ400 fuse used for?

The MERSEN A4BQ400 is a Class L time-delay bolt-on fuse rated 400 A, 600 V AC, and 500 V DC. It protects high-current industrial circuits, such as motor feeders, transformers, and main disconnects, by allowing temporary overloads without nuisance opening.

What are the specifications of the MERSEN A4BQ400 fuse?

The MERSEN A4BQ400 is a Class L, A4BQ Series, bolt-on body, time-delay fuse rated 400 A, 600 V AC, and 500 V DC. Its bolt-on design ensures secure mounting in high-current applications. The manufacturer part number is A4BQ400.

Where to buy the MERSEN A4BQ400 fuse worldwide?

You can source the MERSEN A4BQ400 fuse through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time.

How to select the correct MERSEN A4BQ400 fuse for an application?

Select the MERSEN A4BQ400 fuse by matching its 400 A rating, 600 V AC or 500 V DC voltage, and Class L time-delay characteristics to your circuit's full-load current and inrush requirements. Ensure the bolt-on body fits your existing fuse holder or disconnect switch.

Used in

Common applications for MERSEN
Power electronics protection — MERSEN A70Q series semiconductor fuses in variable frequency drives for motor control.
Surge protection for industrial panels — MERSEN STP480D07 SPDs in three-phase 480V AC distribution boards.
Control circuit overcurrent protection — MERSEN ATM series midget fuses in PLC and instrumentation cabinets.
Power distribution in manufacturing — MERSEN FSPDB4A finger-safe blocks in motor control centers for wire management.
DC bus protection in renewable energy — MERSEN A30QS series fuses in solar inverter DC inputs.
High-voltage semiconductor protection — MERSEN A70Q series fuses in welding equipment power supplies.

MERSEN Products

3G Electric supplies MERSEN time-delay bolt-on fuses. 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
MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 500 A, 600 V AC, 500 V DC (MPN A4BQ500)
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MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 500 A, 600 V AC, 500 V DC (MPN A4BQ500)
MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 450 A, 600 V AC, 500 V DC (MPN A4BQ450)
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MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 450 A, 600 V AC, 500 V DC (MPN A4BQ450)
MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 350 A, 600 V AC, 500 V DC (MPN A4BQ350)
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MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 350 A, 600 V AC, 500 V DC (MPN A4BQ350)
MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 601 A, 600 V AC, 500 V DC (MPN A4BQ601)
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MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 601 A, 600 V AC, 500 V DC (MPN A4BQ601)
MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 4 kA, 600 V AC, 500 V DC (MPN A4BQ4000)
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MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 4 kA, 600 V AC, 500 V DC (MPN A4BQ4000)
Class L time-delay bolt-on fuse from the A4BQ Series. Rated 700 A, 600 V AC and 500 V DC. Designed for overcurrent protection in high-current electrical systems such as industrial power distribution and motor circuits
MERSEN
Class L time-delay bolt-on fuse from the A4BQ Series. Rated 700 A, 600 V AC and 500 V DC. Designed for overcurrent protection in high-current electrical systems such as industrial power distribution and motor circuits

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Class L time-delay bolt-on fuse from the A4BQ Series. Rated 1.35 kA, 600 V AC, and 500 V DC. Designed for high-current industrial applications such as motor starters, transformers, and power distribution panels, where time-delay characteristics prevent nuisance opening during inrush currents
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Class L time-delay bolt-on fuse from the A4BQ Series. Rated 1.35 kA, 600 V AC, and 500 V DC. Designed for high-current industrial applications such as motor starters, transformers, and power distribution panels, where time-delay characteristics prevent nuisance opening during inrush currents
The MERSEN A4BQ1600 is a Class L time-delay bolt-on fuse from the A4BQ Series. Rated for 1.6 kA at 600 V AC and 500 V DC, it provides overcurrent protection in industrial electrical systems such as switchgear, transformers, and motor control centers
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The MERSEN A4BQ1600 is a Class L time-delay bolt-on fuse from the A4BQ Series. Rated for 1.6 kA at 600 V AC and 500 V DC, it provides overcurrent protection in industrial electrical systems such as switchgear, transformers, and motor control centers
The MERSEN A4BY3001 is a Class L time-delay bolt-on fuse from the A4BY Series, rated at 3.001 kA, 600 V AC, and 300 V DC. Its bolt-on body design provides secure installation in industrial electrical panels. This fuse is used for overcurrent protection in high-current applications such as motors, transformers, and heavy equipment
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The MERSEN A4BY3001 is a Class L time-delay bolt-on fuse from the A4BY Series, rated at 3.001 kA, 600 V AC, and 300 V DC. Its bolt-on body design provides secure installation in industrial electrical panels. This fuse is used for overcurrent protection in high-current applications such as motors, transformers, and heavy equipment
Class L time-delay bolt-on fuse from the A4BQ Series. Rated for 1.9 kA at 600 V AC and 500 V DC. Provides overcurrent protection in industrial power distribution, motor control centers, and switchgear
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Class L time-delay bolt-on fuse from the A4BQ Series. Rated for 1.9 kA at 600 V AC and 500 V DC. Provides overcurrent protection in industrial power distribution, motor control centers, and switchgear
The MERSEN A4BY900 is a 900 A, 600 V AC, 300 V DC Class L time-delay bolt-on fuse from the A4BY Series. It features a bolt-on body for secure mounting in electrical distribution systems. This fuse is used for overcurrent protection in high-current circuits, such as switchboards, panelboards, and motor control centers
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The MERSEN A4BY900 is a 900 A, 600 V AC, 300 V DC Class L time-delay bolt-on fuse from the A4BY Series. It features a bolt-on body for secure mounting in electrical distribution systems. This fuse is used for overcurrent protection in high-current circuits, such as switchboards, panelboards, and motor control centers
The MERSEN A4BQ600 is a Class L time-delay bolt-on fuse from the A4BQ Series, rated at 600 A and 600 V AC / 500 V DC. Designed for overcurrent protection in high-current electrical systems, it is commonly used in industrial power distribution, switchboards, and motor control centers
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The MERSEN A4BQ600 is a Class L time-delay bolt-on fuse from the A4BQ Series, rated at 600 A and 600 V AC / 500 V DC. Designed for overcurrent protection in high-current electrical systems, it is commonly used in industrial power distribution, switchboards, and motor control centers
The MERSEN CNL40 is a 40 A, 80 V DC time-delay bolt-on fuse from the CNL series. It is rated for AC/DC circuits and features an indicating function. This fuse is commonly used in low-voltage DC power systems and industrial vehicle applications such as forklift limiters
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The MERSEN CNL40 is a 40 A, 80 V DC time-delay bolt-on fuse from the CNL series. It is rated for AC/DC circuits and features an indicating function. This fuse is commonly used in low-voltage DC power systems and industrial vehicle applications such as forklift limiters
The MERSEN A4BQ3500 is a Class L time-delay bolt-on fuse from the A4BQ Series. Rated at 3.5 kA, 600 V AC, and 500 V DC, it provides overcurrent protection in industrial electrical systems such as switchboards, panelboards, and motor control centers. The bolt-on body design ensures secure mounting in fuse holders for high-interrupting-capacity applications
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The MERSEN A4BQ3500 is a Class L time-delay bolt-on fuse from the A4BQ Series. Rated at 3.5 kA, 600 V AC, and 500 V DC, it provides overcurrent protection in industrial electrical systems such as switchboards, panelboards, and motor control centers. The bolt-on body design ensures secure mounting in fuse holders for high-interrupting-capacity applications