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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.201 kA, 600 V AC - Time-Delay Bolt-On Fuses
MERSENTime-Delay Bolt-On Fuses

MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.201 kA, 600 V AC

The MERSEN A4BY Series Class L Time-Delay Bolt-On Fuse (MPN A4BY1201) is a bolt-on body fuse rated at 1.201 kA, 600 V AC, and 300 V DC. This time-delay fuse from MERSEN is designed for overcurrent protection in…

SKU 3G-OTH-27176

Brand
MERSEN
Item
Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.201 kA, 600 V AC
Category
Time-Delay Bolt-On 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
A4BY1201
Series
A4BY
Type
A4BY Series, Bolt-On Body, Time-Delay, 1.201 kA
AC
600 V
DC
300 V

Technical Documents

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

Product Description

The MERSEN A4BY Series Class L Time-Delay Bolt-On Fuse (MPN A4BY1201) is a bolt-on body fuse rated at 1.201 kA, 600 V AC, and 300 V DC. This time-delay fuse from MERSEN is designed for overcurrent protection in industrial electrical systems.

Frequently Asked Questions

What is the MERSEN A4BY1201 fuse used for?

The MERSEN A4BY1201 is a Class L time-delay bolt-on fuse used for overcurrent protection in industrial electrical systems. It handles high fault currents up to 1.201 kA at 600 V AC or 300 V DC, making it suitable for motor circuits, transformers, and main feeder protection in manufacturing and process plants.

What are the specifications of the MERSEN A4BY1201 fuse?

The MERSEN A4BY1201 is a Class L, A4BY Series, bolt-on body, time-delay fuse rated at 1.201 kA, 600 V AC, and 300 V DC. It is manufactured by MERSEN under part number A4BY1201. The bolt-on design ensures secure mounting in fuse holders or disconnects for industrial power distribution.

Where to buy the MERSEN A4BY1201 fuse worldwide?

3G Electric supplies the MERSEN A4BY1201 fuse worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact 3G Electric for pricing and lead time on this A4BY Series time-delay fuse.

How to select the correct MERSEN A4BY Series fuse for an application?

Select the MERSEN A4BY Series fuse based on system voltage (600 V AC or 300 V DC), continuous current rating (1.201 kA for the A4BY1201), and time-delay characteristics for motor or transformer inrush. Always verify the bolt-on body dimensions match your fuse holder. Consult a qualified engineer for coordination studies.

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, A4BY Series, Bolt-On Body, Time-Delay, 1.2 kA, 600 V AC, 300 V DC (MPN A4BY1200)
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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.2 kA, 600 V AC, 300 V DC (MPN A4BY1200)
MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.4 kA, 600 V AC, 300 V DC (MPN A4BY1400)
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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.4 kA, 600 V AC, 300 V DC (MPN A4BY1400)
MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.35 kA, 600 V AC, 300 V DC (MPN A4BY1350)
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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.35 kA, 600 V AC, 300 V DC (MPN A4BY1350)
MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.5 kA, 600 V AC, 300 V DC (MPN A4BY1500)
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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 1.5 kA, 600 V AC, 300 V DC (MPN A4BY1500)
MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 2 kA, 600 V AC, 300 V DC (MPN A4BY2000)
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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 2 kA, 600 V AC, 300 V DC (MPN A4BY2000)
MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 2.001 kA, 600 V AC, 300 V DC (MPN A4BY2001)
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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 2.001 kA, 600 V AC, 300 V DC (MPN A4BY2001)

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MERSEN Fuse: Class L, A4BY Series, Bolt-On Body, Time-Delay, 4 kA, 600 V AC, 300 V DC (MPN A4BY4000)
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MERSEN Fuse: Class L, A4BQ Series, Bolt-On Body, Time-Delay, 5 kA, 600 V AC, 500 V DC (MPN A4BQ5000)
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