Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE 6,9 URD 30 D08 A 0125 6,9URD30D08A0125
High-speed fuse with aR characteristic for semiconductor protection rated at 125A, 690VAC IEC, and 700VAC UL with striker indication and DIN 80 blade terminals.
£52.30
Why Choose the Mersen H300111 Protistor® High-Speed Fuse?
The Mersen H300111 is a high-performance Protistor® square body semiconductor fuse engineered to provide ultra-fast protection for sensitive power electronic devices. Designed for demanding industrial applications, this 125 A high-speed fuse protects semiconductors including IGBTs, thyristors, diodes and MOSFETs from damaging short-circuit currents.
Part of the renowned Mersen Protistor® size 30 aR series, the H300111 offers exceptional current-limiting performance with a low let-through energy (I²t), helping to minimise damage to expensive power conversion equipment. Its square body design with DIN 80 blade terminals and integrated striker indicator simplifies installation and maintenance in industrial power systems.
Rated for 690 V AC (IEC) and 700 V AC (UL) with a 125 A current rating, the Mersen H300111 is ideally suited for protecting variable speed drives, UPS systems, soft starters, converters and other semiconductor-based equipment operating in demanding industrial environments.
Key Advantages
- Ultra-fast aR semiconductor protection fuse.
- 125 A current rating for industrial power applications.
- 690 V AC IEC / 700 V AC UL voltage rating.
- Protects IGBTs, MOSFETs, thyristors and diodes.
- Integrated striker indicator for simplified maintenance.
- Low I²t design reduces damage during fault conditions.
Key Features
- Mersen Protistor® size 30 aR series.
- Model H300111.
- 125 A rated current.
- 690 V AC (IEC) / 700 V AC (UL).
- Square body fuse with DIN 80 blade terminals.
- Integrated striker trip indicator.
- Current-limiting, ultra-fast semiconductor protection.
- Silver-plated contact surfaces for reliable performance.
Reliable Protection for Power Electronics
Semiconductor protection fuses are specifically designed to react extremely quickly to fault currents, helping to protect sensitive electronic components before excessive thermal energy can cause permanent damage. Their low I²t performance makes them essential in high-power conversion systems.
The Mersen Protistor® H300111 is widely specified by equipment manufacturers and maintenance engineers for protecting industrial drives, converters and power electronics where reliable fault interruption and long-term operational safety are essential.
Typical Applications
- Variable frequency drives (VFDs).
- Industrial motor drives.
- UPS systems.
- Power converters and rectifiers.
- Soft starters.
- Semiconductor protection in industrial automation equipment.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Striker | |
|---|---|---|
| Fuse Type | D / D0 (Neozed/Diazed), Semiconductor | |
| Fuse Class | aR | |
| Voltage | 690 V | |
| Item number | H300111 | |
| Catalogue No | PC30UD69V125A | |
| Description | Square Body High-Speed Fuse Protistor® Size 30 aR 690VAC IEC 700VAC UL 125A With Striker DIN 80 Blades | |
| EAN/UPC Code | 3605340323566 | |
| Rated voltage AC UL | 700 V | |
| Rated voltage AC IEC | 690 V | |
| Ampere Rating | 125 A | |
| RoHS Compliant | Yes | |
| AC or DC | AC | |
| Speed/Characteristic | aR | |
| Fuse Size | 30 | |
| Mounting | Bolted | |
| Clearing I2t At Rated Voltage | 4.9 kA²s | |
| Melting I2t | 0.85 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 | DIN 80 Blades | |
| Product Width | 40 mm | |
| Product Length | 110 mm | |
| Product Height | 48 mm | |
| Sell Pack Quantity | 3 EA | |
| Sell Pack Weight | 0.8199 kg | |
| Sell Pack Width | 135 mm | |
| Sell Pack Length | 145 mm | |
| Sell Pack Height | 55 mm | |
| Product group | Semiconductor Protection Fuses | |
| Body/Insulating Material | Ceramic | |
| Product Weight | 0.2733 kg | |
| Power Dissipation at Rated Current Value | 30 W | |
| HS Code | 85361090 | |
| Country of Manufacture | France |
Frequently Asked Questions
What is the Mersen H300111 used for?
The H300111 protects semiconductor devices such as IGBTs, thyristors, diodes and MOSFETs used in industrial power conversion equipment.
What is the current rating of the H300111?
The fuse has a 125 A current rating.
What voltage is this fuse designed for?
The H300111 is rated for 690 V AC (IEC) and 700 V AC (UL).
What does the aR fuse classification mean?
aR fuses provide ultra-fast short-circuit protection specifically for semiconductor devices while allowing normal operating overloads to be managed by other protective devices.
Which applications commonly use this fuse?
It is commonly installed in VFDs, UPS systems, converters, industrial drives and other power electronic equipment requiring high-speed semiconductor protection.
Trusted Protection for Industrial Power Electronics
Mersen Protistor® semiconductor fuses are trusted worldwide by machine builders, panel manufacturers and maintenance engineers for delivering dependable protection of valuable power electronic equipment.
