ABN Combined Surge Arrester Type 1+2+3 7.5kA TT/TN-S 5-Pole

In residential and commercial electrical installations, the main distribution board is the first line of defense against transient overvoltages from lightning strikes or switching operations. This ABN combined surge arrester, model R9LC2707, is engineered for exactly that location: mounted on a DIN rail in the meter panel or main distribution board, it protects downstream equipment by diverting surge currents to earth. It is suitable for both TT and TN-S earthing systems, making it a versatile choice for many building types.

Key specifications

• Arrester type: Combined Type 1+2+3 (class I+II+III) according to EN 61643-11
• Earthing system compatibility: TT, TN-S
• Number of poles: 5-pole (3P+N+PE)
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Impulse current (Iimp): 7.5 kA (10/350 µs) per pole
• Voltage protection level (Up): < 1.5 kV
• Short-circuit withstand capability (Isccr): 50 kA with 315 A gL/gG backup fuse
• Follow current extinguishing capability (Ifi): 50 kA
• Response time: < 25 ns
• Mounting: DIN rail (6 TE), suitable for meter panels
• Operating temperature range: -40 to +80 °C
• Protection degree: IP20
• Status indication: Optical (green/red)
• Backup fuse requirement: Max. 315 A gL/gG (external)

Why choose it

This arrester combines three protection stages in one compact unit, simplifying installation and reducing space requirements in the distribution board. Its high discharge capacity and low voltage protection level ensure reliable protection for sensitive electronics.

Ideal use cases

• Main distribution boards in residential buildings
• Commercial electrical panels requiring combined surge protection
• Meter panels with limited space
• Installations with TT or TN-S earthing systems

Good to know

The optical status indicator provides at-a-glance monitoring of arrester health. Always install with an external backup fuse of max. 315 A gL/gG as specified.