OBO MCF30-NAR-TT LightningControllerRail 3-Pole Combined Lightning and Surge Arrester with NPE 255V

Combined lightning current and surge arrester (Type 1+2 SPD) for three-phase TN-S and TT systems, offering an extremely low voltage protection level of less than 1.5 kV to safeguard sensitive downstream equipment even under severe surge conditions. This 3-pole unit with integrated NPE module provides complete protection for all live conductors and the neutral-to-earth path.

Advantages

This arrester merges the high discharge capacity of a Type 1 lightning current arrester with the low protection level of a Type 2 surge arrester in one compact device. The spark-gap-based NPE module safely handles high impulse currents, while varistor-based phase modules deliver fast response and excellent voltage limiting. An integrated potential-free changeover contact enables remote status monitoring, allowing quick identification of a faulty module without interrupting power. The DIN-rail mountable housing is made of halogen-free, flame-retardant thermoplastic (UL 94 V-0) with IP20 protection, suitable for distribution boards and industrial control panels. Maintenance-free with a high follow current extinguishing capability of 50 kA, it ensures reliable operation even in networks with high short-circuit currents.

Suitable for

• Three-phase power supply systems (TN-S and TT)
• Protection of sensitive electronic equipment in industrial and commercial installations
• Distribution boards and control panels requiring DIN-rail mounting

Key specifications

• SPD Type: Type 1 + Type 2 (Class I + II)
• Number of Poles: 3-pole + NPE (3P+NPE)
• Max. Continuous Operating Voltage (Uc): 255 V AC
• Nominal Discharge Current (In, 8/20 µs) per pole: 30 kA
• Total Nominal Discharge Current (In total, 8/20 µs): 90 kA
• Impulse Current (Iimp, 10/350 µs) per pole: 7.5 kA
• Total Impulse Current (Iimp total, 10/350 µs): 30 kA
• Voltage Protection Level (Up): < 1.5 kV
• Follow Current Extinguishing Capability (Ifi): 50 kA
• Response Time: < 100 ns
• Mounting Type: DIN Rail (35 mm)
• Housing Material: Thermoplastic, UL 94 V-0
• Degree of Protection: IP20
• Operating Temperature Range: -40 to +80 °C
• Connection Cross-Section (Solid/Stranded): 1.5 - 35 mm² / 1.5 - 25 mm²
• Standards: IEC 61643-11, EN 61643-11
• Remote Signaling Contact: Yes (Potential-free changeover contact)
• Max. Backup Fuse: 315 A gL/gG
• Energy Coordination: Type 1 + Type 2

Recommendations

For optimal protection, install the OBO MCF30-NAR-TT at the main distribution board of three-phase TN-S or TT systems. Ensure proper grounding and use appropriate backup fuses (max. 315 A gL/gG). Regularly check the remote signaling contact to monitor arrester status and replace modules if indicated.