Call Us Today
01706 242050
Trade Portal
MERSEN FUSE A 070 URD 32 KI 1000 A070URD32KI1000

MERSEN FUSE A 070 URD 32 KI 1000 A070URD32KI1000

High-speed fuse engineered for reliable protection of power semiconductors with rapid fault clearing up to 1000A, featuring integrated striker and slotted blades for easy detection and safe disconnection.

SKU: H300203Alt SKU: A070UD32KI1000MPN: H300203
Price
List Price £257.06 ex VAT
Your Price (ex VAT)
£257.06
Manufacturer Lead Time Please contact us for a delivery time before you order
Get the best trade prices Trade exclusive

Create a trade account to unlock exclusive pricing, special offers and more.

Sign up for a trade account Quick & easy setup
SUBTOTAL (EX VAT) £257.06
Trade pricing is personalised to your account

Manufacturer Lead Time

Sold in packs of 3

£257.06

Why Choose the Mersen H300203 Protistor® High-Speed Fuse?

The Mersen H300203 is a heavy-duty Protistor® square body semiconductor fuse designed to provide ultra-fast protection for high-power semiconductor devices in demanding industrial applications. This 1000 A high-speed fuse safeguards IGBTs, thyristors, diodes and other power semiconductors against damaging short-circuit currents while helping maximise equipment uptime.

Part of the Mersen Protistor® Size 32 aR series, the H300203 delivers exceptional current-limiting performance with low let-through energy (I²t), reducing the risk of damage to valuable power conversion equipment. Its square body construction incorporates reinforced short slotted blade terminals and an integrated striker indicator for reliable installation and straightforward maintenance.

Rated for 690 V AC (IEC), 700 V AC (UL) and a 1000 A current rating, the H300203 is ideally suited to protecting high-power converters, industrial drives, UPS systems and other semiconductor-based electrical equipment.

Key Advantages

  • Ultra-fast aR semiconductor protection fuse.
  • 1000 A current rating for high-power industrial applications.
  • 690 V AC IEC / 700 V AC UL voltage rating.
  • Protects IGBTs, thyristors, diodes and other semiconductor devices.
  • Integrated striker indicator for simplified maintenance.
  • Low I²t characteristics help minimise semiconductor damage during fault conditions.

Key Features

  • Mersen Protistor® Size 32 aR series.
  • 1000 A rated current.
  • 690 V AC (IEC) / 700 V AC (UL).
  • Square body ceramic fuse construction.
  • Short slotted blade terminals.
  • Integrated striker indication.
  • Silver-plated contact surfaces for reliable electrical performance.
  • Ultra-fast current-limiting semiconductor protection.

Reliable Protection for High-Power Electronics

High-speed semiconductor fuses interrupt fault currents before excessive thermal energy can damage sensitive power electronic components. Their low I²t characteristics make them essential for protecting industrial converters, motor drives and other high-power semiconductor equipment.

The Mersen H300203 is widely specified by OEMs and maintenance engineers where dependable semiconductor protection and high interrupting capacity are required in demanding industrial power systems.

Typical Applications

  • High-power variable frequency drives (VFDs).
  • Industrial motor control systems.
  • Power converters and rectifiers.
  • UPS systems.
  • Renewable energy power conversion equipment.
  • Heavy industrial automation systems.

Technical Specifications

Item number H300203
Catalogue No A070UD32KI1000
Description Square Body High-Speed Fuse Protistor® Size 32 aR 690VAC IEC 700VAC UL 1000A With Striker Slotted Blades short
EAN/UPC Code 3605340324846
Rated voltage AC UL 700 V
Rated voltage AC IEC 690 V
Ampere Rating 1000 A
RoHS Compliant Yes
AC or DC AC
Speed/Characteristic aR
Fuse Size 32
Mounting Bolted
Clearing I2t At Rated Voltage 1380 kA²s
Melting I2t 240 kA²s
AC Max I.R./Breaking Capacity I1: 200 kA
Indication System Yes
Indication System Type Striker
Connection/Terminal Material Silver-Plated Copper
Connection/Terminal Type Slotted Blades
Product Width 59 mm
Product Length 134 mm
Product Height 65 mm
Sell Pack Quantity 3 EA
Sell Pack Weight 1.6569 kg
Sell Pack Width 160 mm
Sell Pack Length 195 mm
Sell Pack Height 72 mm
Product group Semiconductor Protection Fuses
Body/Insulating Material Ceramic
Product Weight 0.5523 kg
Power Dissipation at Rated Current Value 135 W
HS Code 85361090
Country of Manufacture France
Fuse Type Semiconductor
Fuse Class aR
Voltage 690 V

Frequently Asked Questions

What is the Mersen H300203 used for?

The H300203 provides ultra-fast protection for high-power semiconductor devices used in industrial converters, drives and other power electronic equipment.

What is the current rating of the H300203?

The fuse has a 1000 A current rating.

What voltage is this fuse designed for?

The H300203 is rated for 690 V AC (IEC) and 700 V AC (UL).

What does the aR fuse classification mean?

An aR fuse is designed specifically for semiconductor short-circuit protection, providing extremely fast fault interruption while allowing overload protection to be provided separately.

Where is the H300203 commonly installed?

It is commonly installed in high-power variable frequency drives, converters, UPS systems, renewable energy equipment and industrial power electronic installations.

Trusted Protection for Industrial Power Electronics

Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and maintenance engineers to protect valuable industrial power electronic equipment and minimise costly downtime.

● Service Agreements

Credit Accounts

Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.

 Priority sourcing and supply support

 Flexible payment terms for qualifying organisations

 Support for engineering, maintenance, and operations

500 +

Stock lines ready to ship

1,000 +

Same day dispatches

3500 +

Customers supported

28 

Trusted Manfacturers

● frequently asked questions

Common questions about our products and support

 

At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.

What product ranges do you supply

We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products. 

Can you help specify the correct part?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

Do you have stock for urgent orders?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What are your delivery times and costs?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

What about warranties, returns and faulty items?

Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.

● latest blog

Discover  our latest insights and
expert advice

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

by | Aug 11, 2026 |

LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.

LED Controls: Danfoss Drives Authorised Partner

LED Controls: Danfoss Drives Authorised Partner

by | Jan 17, 2026 |

2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...

LED Controls: Your Complete Control Panel Solution

LED Controls: Your Complete Control Panel Solution

by | Jan 17, 2026 |

2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...