SCHELINGER Surge Arrester 4P 5kA (10/350) Class T1+T2 (B+C)

The SCHELINGER A51-SPD01-4P-B+C is a high-performance surge protective device (SPD) designed to protect electrical installations against direct and indirect lightning strikes. Combining Type 1 and Type 2 protection in a single compact unit, it offers reliable overvoltage protection for main distribution boards in buildings with external lightning protection systems.

Advantages

This SPD provides dual-class protection (T1+T2) in a 4-pole configuration, saving space and installation costs. With an impulse current rating of 5 kA (10/350 µs) per pole and a maximum discharge current of 40 kA (8/20 µs), it ensures robust protection against both high-energy surges and frequent transient overvoltages. The visual status indicator (green/red) allows for quick inspection of operational status.

Suitable for

• Main distribution boards in residential, commercial, and industrial buildings
• Installations with external lightning protection systems (LPS)
• Three-phase TN-S, TN-C, TN-C-S, and TT systems
• Protection of sensitive electronic equipment against surge damage

Key specifications

• SPD Type: Type 1 + Type 2 (T1+T2) according to PN-EN 61643-11
• Number of Poles: 4P (3L+N+PE)
• Impulse Current (Iimp) (10/350 µs): 5 kA per pole
• Nominal Discharge Current (In) (8/20 µs): 20 kA per pole
• Maximum Discharge Current (Imax) (8/20 µs): 40 kA per pole
• Maximum Continuous Operating Voltage (Uc): 275 V AC
• Voltage Protection Level (Up): < 1.5 kV
• Nominal Voltage (Un): 230/400 V AC
• Technology: Varistor (MOV)
• Mounting: DIN Rail (TH35)
• Number of Modules: 4 TE
• Short-circuit withstand capability (Isccr): 50 kA
• Max Backup Fuse: 125 A gL/gG

Recommendations

For optimal protection, install this SPD at the main distribution board as close as possible to the service entrance. Ensure proper coordination with downstream Type 2 or Type 3 SPDs. Always follow local electrical codes and manufacturer guidelines.