High-speed fuse designed for reliable protection of power semiconductors with 500A rating, integrated striker for indication, and open slot blades for easy installation.
£240.00
The Mersen P300623 is a premium Protistor® Size 72 high-speed semiconductor fuse designed to provide ultra-fast protection for modern power electronic equipment. Engineered for demanding industrial applications, it protects diodes, thyristors and IGBT devices against damaging short-circuit and overcurrent conditions while helping maximise equipment reliability and minimise downtime.
Part of the advanced Mersen Protistor® Size 72 series, the P300623 features a robust square ceramic body with open slot blade terminals and an integrated striker indicator. Manufactured using die-cut silver fuse elements embedded in solidified sand, it delivers exceptionally low let-through energy and outstanding fault interruption performance for critical semiconductor protection applications.
Rated at 500 A with a 1250 V AC (IEC) / 1300 V AC (UL) voltage rating, the P300623 is ideally suited to industrial drives, UPS systems, renewable energy equipment, power converters and other high-performance electrical installations requiring dependable semiconductor protection.
The Mersen P300623 has been developed for demanding power conversion equipment where semiconductor devices require rapid fault clearance. Its low I²t performance helps minimise thermal stress during fault conditions, reducing the risk of costly equipment damage and extending the service life of protected components.
Suitable for OEM installations and maintenance replacements, the P300623 provides dependable protection in industrial environments where high-speed semiconductor protection is essential for safe and reliable operation.
| Item number | P300623 |
|---|---|
| Catalogue No | PC72UD13C500EF |
| Description | Square Body High-Speed Fuse Protistor® Size 72 aR 1250VAC IEC 1300VAC UL 500A With Striker Open Slot Blades |
| EAN/UPC Code | 3605340331141 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 500 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 72 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 465 kA²s |
| Melting I2t | 57.1 kA²s |
| AC Max I.R./Breaking Capacity | I1: 126 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Copper |
| Connection/Terminal Type | Open Slot Blades |
| Product Width | 59 mm |
| Product Length | 149.4 mm |
| Product Height | 63 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 2.274 kg |
| Sell Pack Width | 157 mm |
| Sell Pack Length | 205 mm |
| Sell Pack Height | 80 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.758 kg |
| Power Dissipation at Rated Current Value | 98 W |
| HS Code | 85351000 |
The P300623 is an ultra-fast semiconductor fuse designed to protect diodes, thyristors and IGBT devices against short-circuit and overcurrent faults.
The Mersen P300623 has a continuous current rating of 500 A.
The fuse is rated at 1250 V AC (IEC) and 1300 V AC (UL).
Yes. It incorporates an integrated striker indicator that can be used with a compatible microswitch for remote indication and maintenance monitoring.
The P300623 is commonly installed in industrial drives, power converters, UPS systems, renewable energy equipment and other semiconductor-based power conversion systems.
Mersen Protistor® semiconductor fuses are trusted by OEMs, electrical engineers and industrial maintenance teams worldwide for reliable protection of high-value power electronic equipment.
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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...
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...