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

3G Electric
MERSEN A30QS50-4 Fast-Acting Bolt-On Fuse, 50 A, 300 V AC/DC - Fast-Acting Bolt-On Fuses
MERSENFast-Acting Bolt-On Fuses

MERSEN A30QS50-4 Fast-Acting Bolt-On Fuse, 50 A, 300 V AC/DC

The MERSEN A30QS Series Semiconductor Fuse (MPN A30QS50-4) is a fast-acting bolt-on fuse rated at 50 A and 300 V AC/300 V DC. This industrial fuse is designed for overcurrent protection in power electronic circuits.

SKU 3G-OTH-25083

Also listed as: A30QS504 · A30QS50 4

Brand
MERSEN
Item
A30QS50-4 Fast-Acting Bolt-On Fuse, 50 A, 300 V AC/DC
Part Number
A30QS50-4
Category
Fast-Acting Bolt-On Fuses
Available to Order
Also known as:A30QS50-4MERSEN
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

MERSEN
Manufacturer Part Number
A30QS50-4
Series
A30QS
Type
Fast-Acting, 50 A
AC
300 V
Voltage Type
AC/DC
DC DC Volt Rating
300 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

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

Product Description

The MERSEN A30QS Series Semiconductor Fuse (MPN A30QS50-4) is a fast-acting bolt-on fuse rated at 50 A and 300 V AC/300 V DC. This industrial fuse is designed for overcurrent protection in power electronic circuits.

Frequently Asked Questions

What is the MERSEN A30QS50-4 semiconductor fuse used for?

The MERSEN A30QS50-4 is a fast-acting bolt-on fuse used for overcurrent protection in power electronic circuits, such as variable frequency drives, UPS systems, and rectifiers. It safeguards sensitive semiconductor devices by quickly clearing faults, preventing damage from short circuits or overloads in industrial equipment.

What are the specifications of the MERSEN A30QS50-4 fuse?

The MERSEN A30QS50-4 is a 50 A, fast-acting semiconductor fuse from the A30QS series. It has an AC voltage rating of 300 V and a DC voltage rating of 300 V, making it suitable for both AC and DC circuits. The bolt-on design ensures secure mounting in industrial fuse holders.

Where to buy the MERSEN A30QS50-4 fuse worldwide?

You can source the MERSEN A30QS50-4 fuse from 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; we provide competitive pricing and reliable sourcing for this fast-acting semiconductor fuse.

How to select the correct MERSEN A30QS50-4 fuse for an application?

To select the MERSEN A30QS50-4, verify your circuit's voltage (300 V AC or DC max) and continuous current (50 A). Ensure the fuse's fast-acting characteristic matches the inrush current of your semiconductor device. Always consult the manufacturer's data sheet for coordination with upstream protection and ambient temperature derating.

Used in

Common applications for MERSEN
Industrial control panels — Mersen USCC1 and USCC2 UL Class CC fuse blocks for DIN rail mounting and finger-safe branch circuit protection.
Motor starters — Mersen ATQ time-delay fuses and DAR0 R-rated fuses for motor overload and short-circuit protection.
Power supplies and instrumentation — Mersen GGM and GSB fast-acting cylindrical fuses for overcurrent protection in compact electronic circuits.
DC systems — Mersen A30QS very-fast-acting square fuses rated 300 V DC for semiconductor and DC equipment protection.
Medium-voltage distribution — Mersen DAR0 R-rated fuses rated 5.08 kV AC for general-purpose overcurrent protection with visual indication.
Not sure this is the right part? Photo-identify it→

MERSEN Products

3G Electric supplies MERSEN 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 MERSEN

View all MERSEN parts →
Fast-acting bolt-on fuse rated 300 A at 700 V AC and 700 V DC. Part of the A70QS series, designed for overcurrent protection in power electronic circuits such as variable frequency drives, UPS systems, and DC power supplies
MERSEN
Fast-acting bolt-on fuse rated 300 A at 700 V AC and 700 V DC. Part of the A70QS series, designed for overcurrent protection in power electronic circuits such as variable frequency drives, UPS systems, and DC power supplies
Class J fast-acting bolt-on fuse with blade body, rated 400 A, 600 V AC, 300 V DC. Non-indicating design. Suitable for overcurrent protection in power distribution, motor control centers, and panelboards requiring high interrupting capacity in a compact form
MERSEN
Class J fast-acting bolt-on fuse with blade body, rated 400 A, 600 V AC, 300 V DC. Non-indicating design. Suitable for overcurrent protection in power distribution, motor control centers, and panelboards requiring high interrupting capacity in a compact form
Class J blade-body fast-acting bolt-on fuse rated 200 A at 600 V AC and 300 V DC. Non-indicating design provides overcurrent protection for industrial distribution panels and motor control centers
MERSEN
Class J blade-body fast-acting bolt-on fuse rated 200 A at 600 V AC and 300 V DC. Non-indicating design provides overcurrent protection for industrial distribution panels and motor control centers

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first