DEHN DSH ZP 2 SG TNC 255 Type 1+2 Combined Surge Arrester 909630

The DEHN DSH ZP 2 SG TNC 255 is a Type 1+2 combined surge arrester designed for TN-C power systems, offering robust protection against lightning strikes and switching overvoltages. Its key strength lies in a high lightning impulse current of 25 kA (10/350 µs) and a low voltage protection level of ≤1.5 kV, ensuring reliable safeguarding of electrical installations.

Advantages

This arrester combines Type 1 and Type 2 protection in a single compact unit, simplifying installation and reducing space requirements. It features a visual status indicator (green/red) for quick operational checks and a thermal disconnect device for safe isolation in case of overload. The thermoplastic housing is flame-retardant (UL 94 V-0) and suitable for DIN rail mounting.

Suitable for

• TN-C power distribution systems
• Main distribution boards and sub-distribution boards
• Protection of sensitive electronic equipment from surge damage

Key specifications

• SPD type: Type 1+2 combined arrester
• Network system: TN-C
• Max. continuous operating voltage (UC): 255 V AC
• Lightning impulse current (Iimp): 25 kA (10/350 µs)
• Nominal discharge current (In): 20 kA (8/20 µs)
• Max. discharge current (Imax): 50 kA (8/20 µs)
• Voltage protection level (Up): ≤1.5 kV
• Follow current extinguishing capability: 50 kA rms
• Short-circuit withstand capability: 50 kA rms
• Response time: ≤100 ns
• Operating temperature range: -40 °C to +80 °C
• Mounting: 35 mm DIN rail
• Number of poles: 2
• Connection cross-section: 1.5–35 mm² solid, 1.5–25 mm² stranded
• Degree of protection: IP20
• Housing material: Thermoplastic, red, UL 94 V-0
• Standards: IEC 61643-11 / EN 61643-11

Recommendations

For optimal protection, install the DEHN DSH ZP 2 SG TNC 255 at the service entrance or main distribution board. Ensure proper grounding and use appropriate backup fuses as per local regulations. Regular inspection of the status indicator is recommended to maintain protection integrity.