Surge arrester MWK
Silicone-housed surge arrester of IEC class station low (SL) for AC systems up to 52 kV
MWK is a surge arrester with metal-oxide (MO) resistors without spark gaps directly molded in silicone housing, in grey color, designed and tested according to IEC 60099-4; it fulfills the requirement of ANSI/IEEE C62.11. Fire and smoke behavior tested and classified according to EN 45545-2.
It is used for secure protection of medium-voltage systems against overvoltages from atmospheric discharges and switching conditions.
Applications
- Medium-voltage distribution transformer
- Medium-voltage cable and cable termination
- Medium-voltage capacitor and capacitor bank
- Other medium-voltage distribution equipment
Why Hitachi Energy?
- Over 100 years of experience in overvoltage protection and more than 30 years with silicone insulation
- Local and global Hitachi Energy application support
- Proven safe short-circuit current design
- Design life of more than 30 years
- Own production of metal-oxide (MO) resistors
- Excellent protection level with low residual voltage
- UV resistant silicone housing with excellent pollution performance
- Maintenance free
Brief performance data
| MWK | MWK K4 | MWK KLL | |
| Maximum system voltage (Us) | kV | 52 | 52 |
| Continuous voltage through arrester (Uc) | kVrms | 4-44 | 8-44 |
| Rated voltage of arrester (Ur) | kVrms | 5-55 | 10-55 |
| Nominal discharge current (In) | kApeak | 10 | 10 |
| Thermal energy rating (Wth) | kJ/kV (Ur) | 5.0 | 5.0 |
| Specified short-term load (SSL) | Nm | 153 | 153 |
| Creepage distance | Standard | Long |
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