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MERSEN FUSE 6,9 URZ 17/50 6,9URZ17/50
Reliable Protistor® 17×49 aR 690VAC IEC 50A fuse-link providing semiconductor protection with high breaking capacity and compliance to BS88 and IEC standards.
£20.99
Why Choose the Mersen P221250 High-Speed Semiconductor Fuse?
The Mersen P221250 is an industrial high-speed semiconductor protection fuse designed to protect sensitive power electronic components against damaging overcurrent and short-circuit conditions. It is intended for applications requiring faster fault interruption than conventional general-purpose fuse-links can typically provide.
This specialist fuse is suitable for protecting semiconductor devices used within variable frequency drives, power converters, rectifiers, inverters and uninterruptible power supply systems. Its rapid operating characteristic helps limit the electrical energy transmitted during a fault, reducing the risk of damage to valuable components and associated equipment.
Manufactured for demanding industrial environments, the P221250 provides reliable circuit protection for power-control and automation equipment. Its robust fuse-link construction supports integration into an appropriately rated fuse holder or mounting assembly within electrical panels and power electronic systems.
Key Advantages
- High-speed fuse designed for semiconductor protection.
- Rapid fault interruption helps protect sensitive power electronics.
- Limits damaging energy during short-circuit conditions.
- Suitable for demanding industrial electrical applications.
- Supports improved equipment reliability and reduced downtime.
- Ideal for drives, converters, rectifiers and inverter systems.
Key Features
- Mersen industrial circuit-protection product.
- Manufacturer reference: P221250.
- High-speed operating characteristic.
- Designed for protecting power semiconductor devices.
- Robust industrial fuse-link construction.
- Fast interruption of excessive fault currents.
- Suitable for power conversion and motor-control equipment.
- Compatible with an appropriately specified fuse holder or mounting system.
Reliable Protection for Power Electronics
Power semiconductor devices can sustain serious damage when exposed to excessive fault current, even for a very short period. High-speed fuse-links such as the Mersen P221250 are designed to interrupt faults rapidly and restrict the amount of electrical energy reaching the protected circuit.
This specialised protection helps reduce component failure, unplanned production downtime and costly equipment repairs. Mersen high-speed fuses are widely used in industrial systems where dependable protection of critical power electronic components is essential.
Typical Applications
- Variable frequency drives and motor controllers.
- Industrial power converters.
- Rectifier and inverter systems.
- Uninterruptible power supplies.
- Industrial automation and control panels.
- Power semiconductor switching circuits.
Technical Specifications
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| Fuse Type | Semiconductor | |
|---|---|---|
| Fuse Size | 17x49 mm | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | P221250 | |
| Catalogue No | BS17UZ69V50 | |
| Description | British Standard fuse-link Protistor® 17x49 aR 690VAC IEC 50A | |
| EAN/UPC Code | 3605340251524 | |
| 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 | 17x49 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 970 A²s | |
| Melting I2t | 155 A²s | |
| AC Max I.R./Breaking Capacity | I1: 200 kA | |
| Connection/Terminal Material | Copper | |
| Connection/Terminal Type | L Brackets | |
| Product Diameter | 18.5 mm | |
| Product Length | 77.2 mm | |
| Sell Pack Quantity | 10 EA | |
| Sell Pack Weight | 0.35 kg | |
| Sell Pack Width | 100 mm | |
| Sell Pack Length | 195 mm | |
| Sell Pack Height | 25 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.035 kg | |
| Power Dissipation at Rated Current Value | 17 W | |
| HS Code | 85361050 |
Frequently Asked Questions
What is the Mersen P221250 used for?
The Mersen P221250 is used to provide high-speed overcurrent and short-circuit protection for power semiconductor devices in industrial electrical equipment.
What equipment can the P221250 protect?
It is suitable for power electronic equipment such as variable frequency drives, power converters, rectifiers, inverters and uninterruptible power supplies.
Why is a high-speed fuse required for semiconductor equipment?
A high-speed fuse interrupts excessive current rapidly, helping limit the energy reaching sensitive semiconductor components before serious damage can occur.
Is the Mersen P221250 a general-purpose fuse?
No. It is intended primarily for specialised semiconductor and power-electronics protection rather than ordinary general-purpose circuit protection.
How should the P221250 be installed?
The fuse should be installed in a compatible and correctly rated fuse holder or mounting assembly in accordance with the equipment manufacturer’s electrical and safety requirements.
Trusted for Industrial Circuit Protection
Mersen high-speed fuses are widely used by industrial engineers, panel builders and equipment manufacturers to protect critical power semiconductors and support reliable operation in demanding electrical systems.
