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MERSEN FUSE A 070 URD 30 LI 0050 A070UD30LI50
High-speed aR fuse designed for semiconductor protection with a 50A rating at 690VAC IEC and 700VAC UL, featuring a ceramic square body, silver-plated copper slotted blades, and integrated striker indication system.
£85.93
Why Choose the Mersen A301921 High-Speed Semiconductor Fuse?
The Mersen A301921 is a high-performance semiconductor protection fuse developed to provide rapid and dependable protection for sensitive power electronic equipment. Designed for industrial applications where conventional fuses may not operate quickly enough, it helps protect semiconductor components against damaging short-circuit currents.
As part of Mersen’s established range of electrical protection products, the A301921 combines fast fault interruption with effective current limitation. This reduces the amount of electrical and thermal energy allowed to pass through protected equipment during a fault, helping to minimise component damage, equipment downtime and maintenance costs.
The Mersen A301921 is suitable for integration into industrial drives, rectifiers, inverters, power converters and other systems containing semiconductor devices. Its robust industrial construction supports reliable operation in demanding electrical installations and power control equipment.
Key Advantages
- High-speed fuse designed for semiconductor protection.
- Rapid fault interruption helps protect sensitive power electronic components.
- Excellent current-limiting performance reduces damaging let-through energy.
- Suitable for demanding industrial power conversion equipment.
- Robust construction supports dependable long-term operation.
- Helps reduce equipment downtime and costly semiconductor replacement.
Key Features
- Mersen industrial semiconductor fuse.
- Manufacturer reference A301921.
- High-speed operating characteristic.
- Designed for protection against short-circuit currents.
- Low let-through energy for improved semiconductor protection.
- Suitable for use with industrial power electronics.
- Engineered for reliable performance in demanding installations.
- Compatible with correctly rated fuse holders and mounting systems.
Reliable Protection for Industrial Power Electronics
Semiconductor devices can be damaged by fault currents in a fraction of a second. High-speed fuses such as the Mersen A301921 are engineered to respond rapidly, interrupting dangerous currents before excessive thermal energy reaches sensitive components.
This fast response makes the fuse particularly suitable for protecting diodes, thyristors, rectifiers, IGBTs and other power semiconductor devices used in industrial control and power conversion systems. Correct fuse selection can improve equipment reliability while reducing the risk of extensive secondary damage.
Typical Applications
- Variable frequency drives and industrial motor controls.
- Power converters and rectifier systems.
- Industrial inverters and power supplies.
- Uninterruptible power supply equipment.
- Automation and process control systems.
- Renewable energy and energy conversion equipment.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | A301921 | |
| Catalogue No | A070UD30LI50 | |
| Description | Square Body High-Speed Fuse Protistor® Size 30 aR 690VAC IEC 700VAC UL 50A With Striker Slotted Blades long | |
| EAN/UPC Code | 3605340348620 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 50 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 30 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 0.68 kA²s | |
| Melting I2t | 0.116 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 | 40 mm | |
| Product Length | 148.6 mm | |
| Product Height | 48 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 0.9639 kg | |
| Sell Pack Width | 133 mm | |
| Sell Pack Length | 157 mm | |
| Sell Pack Height | 54 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.3213 kg | |
| Power Dissipation at Rated Current Value | 9 W | |
| HS Code | 85361050 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen A301921 used for?
The Mersen A301921 is used to provide high-speed short-circuit protection for semiconductor devices and industrial power electronic equipment.
What components can this fuse protect?
It can be used in correctly engineered circuits containing power semiconductors such as diodes, thyristors, rectifiers and IGBTs.
Is the Mersen A301921 a standard general-purpose fuse?
No. It is intended for high-speed semiconductor protection applications where rapid fault interruption and low let-through energy are required.
Where is this fuse commonly installed?
It is commonly used in industrial drives, power converters, rectifiers, inverters, power supplies and automation equipment.
How should the correct replacement fuse be selected?
The replacement fuse should match the original Mersen A301921 reference and the required current, voltage, breaking capacity and mounting specifications of the equipment.
Trusted Industrial Electrical Protection
Mersen electrical protection products are widely used by engineers, panel builders and equipment manufacturers to safeguard industrial power systems and sensitive electronic components.
