The Protistor® PC70UD13C125PA high-speed fuse offers superior protection for sensitive power semiconductor devices in demanding industrial applications. Rated at 125A with voltage operation up to 1300VAC (IEC) and 1250VAC (UL), it ensures rapid fault interruption and enhanced system reliability.
£132.07
The Mersen K301125 is an industrial high-speed semiconductor protection fuse designed to safeguard sensitive power electronic components against damaging short-circuit currents. Manufactured by Mersen, it is suitable for professionally engineered electrical systems requiring rapid fault interruption and effective limitation of energy let-through.
High-speed fuses are commonly used to protect IGBTs, thyristors, diodes, rectifiers, inverters and power conversion equipment. Their fast operating characteristics help reduce thermal and electrical stress on valuable semiconductor devices, supporting improved equipment reliability and reduced unplanned downtime.
The K301125 is intended for installation within a correctly coordinated industrial protection system. Its exact current rating, voltage rating, utilisation category, breaking capacity, terminal arrangement and physical dimensions should be confirmed from the product label or official Mersen technical documentation before selection or installation.
Semiconductor fuses are designed to operate considerably faster than conventional general-purpose fuses. By interrupting excessive current before damaging thermal energy reaches sensitive electronic components, they help protect power modules and reduce the risk of extensive equipment failure.
The Mersen K301125 should be selected according to the circuit voltage, normal operating current, prospective short-circuit current and the protection requirements of the connected semiconductor devices. Any replacement fuse must provide compatible electrical characteristics, mounting arrangements and physical dimensions.
| Item number | K301125 |
|---|---|
| Catalogue No | PC70UD13C125PA |
| Description | Square Body High-Speed Fuse Protistor® Size 70 aR 1250VAC IEC 1300VAC UL 125A Striker Plain Blades |
| EAN/UPC Code | 3605340337204 |
| Rated voltage AC UL | 1300 V |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 125 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 72 |
| Mounting | Clip |
| Clearing I2t At Rated Voltage | 10500 A²s |
| Melting I2t | 1310 A²s |
| 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 | Plain Blades |
| Product Width | 39.8 mm |
| Product Length | 123.4 mm |
| Product Height | 49.5 mm |
| Sell Pack Quantity | 3 EA |
| Sell Pack Weight | 1.092 kg |
| Sell Pack Width | 140 mm |
| Sell Pack Length | 143 mm |
| Sell Pack Height | 65 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 0.364 kg |
| Power Dissipation at Rated Current Value | 38 W |
| HS Code | 85351000 |
The K301125 is designed to provide high-speed protection for sensitive semiconductor devices used in industrial power electronic equipment.
It may be used in compatible circuits to protect components such as IGBTs, thyristors, diodes, rectifiers and power converter modules.
The rated current, voltage, operating characteristic and breaking capacity should be confirmed from the fuse label or official Mersen technical documentation before installation.
It should only be used as a replacement when its electrical ratings, operating characteristics, terminals and physical dimensions are fully compatible with the original fuse.
It may be installed in compatible industrial drives, power converters, UPS equipment, renewable energy systems and semiconductor protection assemblies.
Mersen high-speed fuses are used by engineers, panel builders, equipment manufacturers and maintenance professionals to help protect critical power electronic systems against damaging short-circuit currents.
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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...