High-speed fuse designed for protection of power semiconductors with 900A rating, 1250VAC voltage, striker indication, and flush end metric threads.
£533.74
The Mersen G300731 is a specialist high-speed semiconductor fuse developed to protect sensitive power electronic components against damaging short-circuit currents. As part of the established Mersen Protistor® range, it is intended for industrial electrical systems where rapid fault interruption and effective current limitation are essential.
Semiconductor devices can be damaged by excessive current within a fraction of a second. The G300731 is engineered to respond significantly faster than a conventional general-purpose fuse, helping limit the peak fault current and thermal energy passed to valuable components such as IGBTs, thyristors, SCRs, diodes and rectifier modules.
Its robust industrial construction and efficient internal arc-quenching system make the Mersen G300731 suitable for demanding power-conversion and motor-control equipment. It can be incorporated into compatible fuse holders, busbar assemblies and manufacturer-designed electrical systems used in drives, inverters, rectifiers and industrial power supplies.
High-speed fuses are an important part of coordinated semiconductor protection. During a severe fault, the fuse element operates rapidly to restrict the current peak and total energy reaching the protected power module.
This fast response can help prevent secondary damage to connected components, reduce repair costs and shorten equipment downtime. The correct fuse must be selected according to the circuit voltage, operating current, semiconductor withstand characteristics and applicable electrical standards.
| Item number | G300731 |
|---|---|
| Catalogue No | PC273UD13C900TF |
| Description | Square Body High-Speed Fuse Protistor® 2x73 aR 1250VAC IEC 900A With Striker Flush ends metric threads |
| EAN/UPC Code | 3605340332766 |
| Rated voltage AC IEC | 1250 V |
| Ampere Rating | 900 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 2x73 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 1150 kA²s |
| Melting I2t | 142 kA²s |
| AC Max I.R./Breaking Capacity | I1: 100 kA |
| Indication System | Yes |
| Indication System Type | Striker |
| Connection/Terminal Material | Silver-Plated Brass |
| Connection/Terminal Type | Flush ends |
| Product Width | 167 mm |
| Product Length | 91 mm |
| Product Height | 78.5 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 2.53 kg |
| Sell Pack Width | 90 mm |
| Sell Pack Length | 205 mm |
| Sell Pack Height | 95 mm |
| Product group | Semiconductor Protection Fuses |
| Body/Insulating Material | Ceramic |
| Product Weight | 2.53 kg |
| Power Dissipation at Rated Current Value | 208 W |
| HS Code | 85351000 |
| Country of Manufacture | France |
The Mersen G300731 is used to provide rapid short-circuit protection for semiconductor components installed in industrial drives, converters, rectifiers, inverters and other power electronic equipment.
No. It is a specialist high-speed fuse intended primarily for protecting sensitive semiconductor devices against short-circuit currents.
In a correctly designed and rated circuit, the fuse can protect components such as IGBTs, thyristors, SCRs, diodes and rectifier modules.
Low let-through energy reduces the electrical and thermal stress placed on semiconductor devices during a fault, helping minimise damage to sensitive components.
It is typically installed in a compatible fuse holder, busbar system or manufacturer-designed assembly inside industrial power-conversion and motor-control equipment.
Mersen Protistor® high-speed fuses are widely specified by electrical engineers and equipment manufacturers for rapid, dependable protection of sensitive semiconductor components 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...