OBO MCF25-NAR-TNC LightningController Rail 3-Pole 255V Type 1+2 Surge Arrester

The OBO MCF25-NAR-TNC LightningController Rail is a 3-pole combined lightning current and surge arrester (Type 1+2) engineered for TN-C power systems. Its core strength lies in handling lightning impulse currents up to 25 kA per pole (75 kA total) while clamping voltage to below 1.5 kV, ensuring robust protection for critical electrical infrastructure.

Advantages

This arrester integrates a thermal disconnector and visual status indication for immediate operational feedback. The flame-retardant thermoplastic housing (UL 94 V-0) and wide operating temperature range (-40 to +80 °C) deliver reliability in harsh environments. With a short-circuit withstand capability of 50 kA (with 315 A gL/gG fuse), it ensures safety under fault conditions.

Suitable for

• Main distribution boards in residential and commercial buildings
• Industrial facilities with TN-C earthing systems
• Protection of sensitive equipment from direct lightning strikes and surges
• Coordination with downstream Type 3 surge arresters

Key specifications

• Arrester type: Type 1+2 combined lightning current and surge arrester
• Network system: TN-C, 3-pole
• Max continuous operating voltage (Uc): 255 V AC
• Lightning impulse current (Iimp): 25 kA per pole (10/350 µs)
• Voltage protection level (Up): < 1.5 kV
• Mounting: DIN rail 35 mm
• Connection cross-section: 1.5–35 mm² rigid, 1.5–25 mm² flexible
• Standards: IEC 61643-11, EN 61643-11

Recommendations

For optimal performance, install this arrester at the service entrance and coordinate with Type 3 devices near sensitive loads. Regular inspection of the visual indicator is advised to ensure continuous protection.