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MERSEN FUSE A 070 URD 33 LI 0700 A070URD33LI0700
High-speed aR fuse designed for power semiconductor protection up to 700A with striker indication and slotted blade terminals. Certified to IEC and UL standards for 690-700VAC.
£128.27
Why Choose the Mersen N300231 Protistor® High-Speed Fuse?
The Mersen N300231, catalogue number A070UD33LI700, is a premium square body high-speed semiconductor protection fuse engineered to provide exceptional protection for power electronic equipment. As part of the trusted Mersen Protistor® Size 33 series, this ultra-fast aR fuse is specifically designed to safeguard sensitive semiconductor devices including diodes, thyristors, IGBTs and power converters.
Designed for demanding industrial applications, the N300231 combines rapid fault interruption with high breaking capacity to minimise damage caused by short circuits. Its silver-plated contacts, solidified sand construction and precision-manufactured fuse elements provide dependable performance, while the integrated striker enables remote indication and enhanced maintenance capabilities.
With a 700 A current rating and a 690 V AC IEC / 700 V AC UL voltage rating, the Mersen N300231 is ideal for protecting variable speed drives, UPS systems, DC drives, renewable energy equipment and industrial power conversion systems. The long slotted blade terminals enable straightforward installation into compatible fuse bases and switchgear assemblies.
Key Advantages
- Ultra-fast aR semiconductor protection fuse for sensitive power electronics.
- 700 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Protects IGBTs, thyristors, SCRs and semiconductor devices against short circuits.
- Integrated striker indicator for remote status indication.
- High breaking capacity with low let-through energy (I²t).
Key Features
- Mersen Protistor® Size 33 series.
- 700 A rated current.
- 690 V AC IEC / 700 V AC UL operating voltage.
- aR ultra-fast operating characteristic.
- Long slotted blade terminals.
- Integrated striker mechanism.
- Silver-plated contact surfaces.
- Designed specifically for semiconductor protection.
Reliable Protection for Power Electronics
Semiconductor protection fuses are engineered to clear high fault currents before sensitive electronic components are damaged. Their ultra-fast response significantly reduces thermal and mechanical stress, helping maximise equipment reliability and minimise costly downtime.
The Mersen Protistor® range has become a preferred choice for industrial engineers and OEM manufacturers requiring dependable protection for modern power conversion equipment operating in demanding electrical environments.
Typical Applications
- Variable frequency drives (VFDs).
- Servo drive systems.
- Industrial power converters.
- UPS and backup power systems.
- Renewable energy inverters.
- Motor control centres.
- Battery energy storage systems.
- Semiconductor power protection.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | N300231 | |
| Catalogue No | A070UD33LI700 | |
| Description | Square Body High-Speed Fuse Protistor® Size 33 aR 690VAC IEC 700VAC UL 700A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340325355 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 700 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 33 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 330 kA²s | |
| Melting I2t | 57 kA²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Design Details | Standard Terminal | |
| Indication System | Yes | |
| Indication System Type | Striker | |
| Connection/Terminal Material | Silver-Plated Copper | |
| Connection/Terminal Type | Slotted Blades | |
| Product Width | 73 mm | |
| Product Length | 153 mm | |
| Product Height | 78.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 2.6298 kg | |
| Sell Pack Width | 160 mm | |
| Sell Pack Length | 250 mm | |
| Sell Pack Height | 90 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.8766 kg | |
| Power Dissipation at Rated Current Value | 125 W | |
| HS Code | 85361090 |
Frequently Asked Questions
What is the Mersen N300231 used for?
The Mersen N300231 is designed to protect semiconductor devices such as IGBTs, SCRs, thyristors and diodes against high fault currents in industrial power electronic equipment.
What is the current rating of this fuse?
The fuse has a 700 A continuous current rating.
What voltage is the N300231 rated for?
It is rated for 690 V AC (IEC) and 700 V AC (UL).
What does the aR characteristic mean?
The aR classification indicates an ultra-fast semiconductor protection fuse intended to provide short-circuit protection for sensitive electronic components.
Does the fuse include an indicator?
Yes. The N300231 features an integrated striker that provides fuse operation indication and can be used with compatible microswitch accessories.
Trusted by Industrial Power System Designers
Mersen Protistor® high-speed semiconductor fuses are trusted worldwide by OEMs, machine builders and industrial engineers for protecting critical power electronic equipment with fast, reliable fault interruption.
