High-speed Protistor® fuse for semiconductor protection with integrated striker indication and DIN 110 blades, rated for 800A at 690VAC IEC / 700VAC UL.
£207.21
The Mersen H300709 (Catalogue No. PC31UD69V800D1A) is a Protistor® Size 31 aR square body high-speed semiconductor fuse designed to protect sensitive power electronic devices. Rated at 800A, 690VAC (IEC) and 700VAC (UL), it delivers ultra-fast fault interruption for demanding industrial power conversion applications.
Manufactured by Mersen, the H300709 features a ceramic square body, silver-plated DIN 110 blade terminals and an integrated striker indicator. Its low let-through energy (I²t) and high breaking capacity provide outstanding protection for IGBTs, thyristors, diodes and other semiconductor devices used in modern power electronics.
The Protistor® Size 31 range has been engineered for industrial drives, UPS systems, renewable energy converters, battery storage systems and other equipment requiring reliable semiconductor protection with minimal downtime.
The Mersen H300709 has been specifically engineered to minimise fault energy reaching expensive semiconductor devices. Its ultra-fast aR operating characteristic rapidly clears short-circuit faults while maintaining excellent protection for IGBTs, thyristors, diodes and other power semiconductor components used in industrial converters and drives.
| Current | 11 A |
|---|---|
| Item number | H300709 |
| Catalogue No | PC31UD69V800D1A |
| Description | Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 700VAC UL 800A With Striker DIN 110 Blades |
| EAN/UPC Code | 3605340332513 |
| Rated voltage AC UL | 700 V |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 800 A |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 31 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 880000 A²s |
| Melting I2t | 140000 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 | DIN 110 Blades |
| Product Width | 51 mm |
| Product Length | 134.6 mm |
| Product Height | 56.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.2429 kg |
| Sell Pack Width | 142 mm |
| Sell Pack Length | 166 mm |
| Sell Pack Height | 62 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.4143 kg |
| Power Dissipation at Rated Current Value | 120 W |
| HS Code | 85361090 |
| Country of Manufacture | France |
The H300709 is a Protistor® high-speed semiconductor fuse designed to protect IGBTs, thyristors, diodes and other sensitive semiconductor devices used in industrial power conversion equipment.
The fuse is rated at 690VAC according to IEC standards and 700VAC according to UL standards.
The Mersen H300709 has a continuous current rating of 800A.
Yes. The H300709 includes an integrated striker indicator for remote fuse operation signalling.
This model features DIN 110 silver-plated blade terminals for secure bolted installation.
Mersen Protistor® semiconductor fuses are trusted worldwide by equipment manufacturers, electrical engineers and maintenance professionals for protecting high-value power electronic equipment in demanding industrial applications.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...