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⚡ Mersen PC121UD20C250EF — High-Speed Square Body Fuse
Precision protection for power electronics — the PC121UD20C250EF delivers ultra-fast response, low I²t, and high interrupting capacity, making it ideal for safeguarding IGBTs, diodes, and SCRs in drives, UPS systems, and inverters.
🔧 Key Features
- Fuse Type: High-speed square body fuse
- Rated Current: 250 A
- Rated Voltage: 700 V AC / 500 V DC
- Breaking Capacity: 200 kA AC / 100 kA DC
- Fuse Speed: Ultra-fast acting (semiconductor protection)
- Mounting Style: Bolt-on (DIN standardized)
- Body Size: PC121 (121 mm length class)
- Indicator: Optional striker pin for remote signaling
- Housing Material: Ceramic body with silver-plated copper blades
- Standards: IEC 60269-4, UL Recognized, RoHS compliant
- Applications: Drives, UPS, inverters, power converters, traction systems
📊 Technical Specifications
| Attribute | Value |
|---|---|
| Part Number | N083226 |
| Series | PC121UD |
| Current Rating | 250 A |
| Voltage Rating | 700 V AC / 500 V DC |
| Clearing I²t @ Rated V | Low I²t for minimal thermal stress |
| Power Loss | Optimized for low watts loss |
| Operating Temp Range | –40 °C to +130 °C |
| Striker Option | Yes (remote indication) |
| Mounting Torque | Specified per blade size (typically 20–25 Nm) |
| Compliance | IEC, UL, CE, RoHS, Reach |
🔗 Related Models in the PC121UD Series
| Model Number | Current Rating | Voltage Rating | Notes |
|---|---|---|---|
| PC121UD20C160EF | 160 A | 700 V AC | Lower current variant |
| PC121UD20C200EF | 200 A | 700 V AC | Mid-range protection |
| PC121UD20C315EF | 315 A | 700 V AC | Higher current rating |
| PC121UD20C400EF | 400 A | 700 V AC | Heavy-duty variant |
| PC121UD20C250EF-STR | 250 A | 700 V AC | With striker pin |
These variants offer flexibility across current ratings and signaling options — ideal for tailoring to semiconductor protection profiles and system fault coordination.
📦 Applications
- Variable frequency drives (VFDs)
- UPS and inverter systems
- Power converters and rectifiers
- Railway traction and propulsion systems
- Battery energy storage systems (BESS)
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