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MERSEN FUSE 6,9 URD 31 EF 0500 6,9URD31EF0500
High-speed aR fuse with 500A rating, suitable for protecting power semiconductor devices in industrial applications. Features striker indication and open slot blade terminals.
£100.27
Why Choose the Mersen H300042 Protistor® High-Speed Fuse?
The Mersen H300042 (PC31UD69V500EF) is a premium square body high-speed semiconductor fuse from the Protistor® Size 31 aR series, engineered to provide outstanding short-circuit protection for modern power electronic equipment. Specifically designed for semiconductor applications, it delivers ultra-fast fault interruption to protect sensitive devices including IGBTs, thyristors, SCRs and power diodes from damaging fault currents.
Manufactured using precision die-cut silver fuse elements embedded in solidified silica sand, the fuse offers exceptional current limitation, low let-through energy (I²t) and high interrupting capacity. Silver-plated contact surfaces and non-magnetic hardware provide long-term reliability, while the integrated striker indicator enables local indication and optional remote signalling using compatible microswitch accessories.
With a 500 A current rating, 690 V AC IEC / 700 V AC UL voltage rating and aR ultra-fast operating characteristic, the H300042 is ideally suited to industrial drives, UPS systems, power converters, renewable energy equipment and other demanding semiconductor protection applications.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 500 A current rating for demanding industrial applications.
- 690 V AC IEC / 700 V AC UL voltage ratings.
- Designed specifically for protecting IGBTs, thyristors, SCRs and power diodes.
- Integrated striker indicator for fuse status monitoring.
- Excellent current limitation with low let-through energy.
Key Features
- Mersen Protistor® Size 31 aR series.
- Catalogue number: PC31UD69V500EF.
- 500 A rated current.
- 690 V AC IEC / 700 V AC UL rated voltage.
- Square body ceramic fuse.
- Open slot blade terminals (EF mounting style).
- Integrated mechanical striker indication.
- Silver-plated contacts with non-magnetic hardware.
Reliable Protection for Industrial Power Electronics
The Protistor® Size 31 range has been developed to provide state-of-the-art semiconductor protection for industrial power conversion equipment. Its ultra-fast operating characteristic limits peak fault current and thermal energy, helping maximise the service life of expensive semiconductor assemblies while reducing maintenance costs and equipment downtime.
The H300042 is widely used in industrial automation, renewable energy systems, UPS installations, motor drives and power conversion equipment where dependable semiconductor protection is essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- Power converters and rectifiers.
- UPS and standby power systems.
- Renewable energy inverters.
- Protection of IGBT, SCR, thyristor and diode modules.
Technical Specifications
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| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | H300042 | |
| Catalogue No | PC31UD69V500EF | |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 500A With Striker Open Slot Blades | |
| EAN/UPC Code | 3605340322668 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 500 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 31 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 215000 A²s | |
| Melting I2t | 37000 A²s | |
| 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 | Open Slot Blades | |
| Product Width | 51 mm | |
| Product Length | 109.4 mm | |
| Product Height | 56.5 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 1.2129 kg | |
| Sell Pack Width | 143 mm | |
| Sell Pack Length | 175 mm | |
| Sell Pack Height | 73 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.4043 kg | |
| Power Dissipation at Rated Current Value | 72 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen H300042 used for?
The H300042 is a high-speed semiconductor fuse designed to protect sensitive power electronic devices such as IGBTs, thyristors, SCRs and diodes against damaging short-circuit currents.
What is the current rating of this fuse?
This fuse has a 500 A rated current.
What voltage is the H300042 rated for?
The fuse is rated for 690 V AC (IEC) and 700 V AC (UL).
What does the aR operating characteristic mean?
The aR characteristic provides ultra-fast short-circuit protection specifically for semiconductor devices. It is intended to be used in coordinated protection systems and does not provide overload protection.
What is the purpose of the striker indicator?
The integrated striker provides a mechanical indication when the fuse has operated and can be coupled with compatible microswitch accessories for remote status signalling.
Trusted for Industrial Semiconductor Protection
Mersen Protistor® semiconductor fuses are trusted worldwide by OEMs, panel builders and industrial engineers for delivering rapid fault interruption, excellent current limitation and dependable protection for critical power electronic equipment.
