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MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 50 A, 600 V AC - Fast-Acting Cylindrical Fuses
MERSENFast-Acting Cylindrical Fuses

MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 50 A, 600 V AC

The MERSEN A4J Series is a fast-acting cylindrical fuse, specifically a Class J fuse with a 50 A rating, 600 V AC, and 300 V DC capacity. This model, MPN A4J50, is designed for overcurrent protection in industrial…

SKU 3G-OTH-133119

Brand
MERSEN
Item
Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 50 A, 600 V AC
Category
Fast-Acting Cylindrical Fuses
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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

MERSEN
Manufacturer Part Number
A4J50
Type
Class J, Cylindrical Body, Fast-Acting, 50 A
AC
600 V
DC
300 V

Technical Documents

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

Product Description

The MERSEN A4J Series is a fast-acting cylindrical fuse, specifically a Class J fuse with a 50 A rating, 600 V AC, and 300 V DC capacity. This model, MPN A4J50, is designed for overcurrent protection in industrial equipment.

Frequently Asked Questions

What is the MERSEN A4J50 fuse used for?

The MERSEN A4J50 is a fast-acting Class J cylindrical fuse rated 50 A, 600 V AC, and 300 V DC. It provides overcurrent protection in industrial equipment such as motor control centers, panelboards, and branch circuits where high interrupting capacity is required.

What are the specifications of the MERSEN A4J50 fuse?

The MERSEN A4J50 is a Class J, cylindrical-body, fast-acting fuse rated 50 A, 600 V AC and 300 V DC. It is part of the A4J Series and carries MPN A4J50. These ratings ensure reliable overcurrent protection in demanding industrial applications.

Where to buy MERSEN A4J50 fuses worldwide?

3G Electric supplies the MERSEN A4J50 fuse to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time — we source genuine MERSEN components for industrial overcurrent protection needs.

How to select the right MERSEN A4J fuse for my application?

Select a MERSEN A4J fuse by matching voltage (600 V AC or 300 V DC), current rating (e.g., 50 A for A4J50), and interrupting rating to your circuit. Class J fuses offer compact size and high performance. Consult a qualified engineer to ensure coordination with upstream protection devices.

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 fast-acting cylindrical 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: A4J Series, Class J, Cylindrical Body, Fast-Acting, 6 A, 600 V AC, 300 V DC (MPN A4J6)
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MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 6 A, 600 V AC, 300 V DC (MPN A4J6)
MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 25 A, 600 V AC, 300 V DC (MPN A4J25)
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MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 25 A, 600 V AC, 300 V DC (MPN A4J25)
MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 20 A, 600 V AC, 300 V DC (MPN A4J20)
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MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 20 A, 600 V AC, 300 V DC (MPN A4J20)
MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 60 A, 600 V AC, 300 V DC (MPN A4J60)
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MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 60 A, 600 V AC, 300 V DC (MPN A4J60)
MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 3 A, 600 V AC, 300 V DC (MPN A4J3)
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MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 3 A, 600 V AC, 300 V DC (MPN A4J3)
MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 15 A, 600 V AC, 300 V DC (MPN A4J15)
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MERSEN Fuse: A4J Series, Class J, Cylindrical Body, Fast-Acting, 15 A, 600 V AC, 300 V DC (MPN A4J15)

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