High-speed aR fuse designed for semiconductor protection with a 630A rating, 1100VAC IEC and 1200VAC UL voltage ratings, featuring a ceramic body, striker indication system, and open slot blades for bolted mounting.
£262.27
The Mersen R300625, catalogue reference PC72UD11C630EF, is a Protistor® Size 72 high-speed semiconductor fuse designed to protect sensitive power-conversion equipment against damaging fault currents. Rated at 630A, the fuse supports operating voltages up to 1100VAC under IEC standards and 1200VAC under UL standards.
Its ultra-fast aR operating characteristic makes the R300625 particularly suitable for protecting power semiconductors such as diodes, thyristors and insulated-gate bipolar transistors. Rapid interruption helps limit the thermal and electrical energy transferred to valuable semiconductor devices during short-circuit conditions.
The fuse features a robust square ceramic body, silver-plated open-slot blade contacts and an integrated striker for fault indication or operation of a compatible microswitch. Its bolted mounting arrangement provides a secure connection in industrial power systems, variable-speed drives, rectifiers, inverters and other high-power electronic equipment.
Power semiconductors can be damaged extremely quickly when exposed to excessive current. The Mersen R300625 uses specially engineered fuse elements embedded in solidified sand to control internal arcing and interrupt severe fault currents rapidly. This construction helps deliver low let-through energy and a high interrupting capability.
The fuse is designed for partial-range short-circuit protection and should be coordinated with the equipment’s overload-protection system. Correct fuse selection requires consideration of operating voltage, continuous current, prospective fault current, thermal cycling, cooling conditions and the I²t withstand capability of the protected semiconductor.
| Item number | R300625 |
|---|---|
| Catalogue No | PC72UD11C630EF |
| Description | Square Body High-Speed Fuse Protistor® Size 72 aR 1100VAC IEC 1200VAC UL 630A With Striker Open Slot Blades |
| EAN/UPC Code | 3605340331189 |
| Rated voltage AC UL | 1200 V |
| Rated voltage AC IEC | 1100 V |
| Ampere Rating | 630 A |
| AC or DC | AC |
| Speed/Characteristic | aR |
| Fuse Size | 72 |
| Mounting | Bolted |
| Clearing I2t At Rated Voltage | 690 kA²s |
| Melting I2t | 106.3 kA²s |
| AC Max I.R./Breaking Capacity | I1: 150 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 | 125 W |
| HS Code | 85351000 |
The Mersen R300625 is a 630A Protistor® Size 72 square-body high-speed fuse designed for the short-circuit protection of power semiconductors. Its catalogue reference is PC72UD11C630EF.
The R300625 is rated for 1100VAC under IEC specifications and 1200VAC under UL specifications.
An aR fuse is a partial-range high-speed fuse designed primarily to protect semiconductor devices against short-circuit currents. Separate overload protection may be required within the electrical system.
The fuse is suitable for protecting power semiconductors including diodes, thyristors and IGBT modules used in drives, rectifiers, inverters and industrial power converters.
Yes. The fuse incorporates a striker that provides mechanical indication when the fuse operates and may be used with a compatible microswitch for remote signalling.
The R300625 uses open-slot blade terminals and a bolted mounting arrangement. Installation should be completed by qualified personnel using the specified tightening torque and appropriate electrical safety procedures.
Mersen Protistor® fuses are engineered to provide fast, dependable protection for sensitive semiconductor devices used throughout modern industrial power-conversion systems.
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