DEHN DSH ZP 2 SG TT 255 Type 1+2 Combined Arrester DEHNshield ZP 2 SG 909631

With a lightning impulse current of 50 kA total, the DEHN DSH ZP 2 SG TT 255 combined arrester delivers robust protection for TT and TN-S systems.

Overview

The DEHNshield ZP 2 SG is a Type 1+2 combined surge protective device (SPD) engineered for 4-pole installation on 35 mm DIN rails. It integrates encapsulated spark gap technology to handle both direct lightning currents and switching surges, ensuring reliable protection for low-voltage power distribution systems.

What stands out

• High discharge capacity: 12.5 kA per pole (10/350 µs) and 50 kA total.
• Low voltage protection level: ≤ 1.5 kV at Iimp, safeguarding sensitive equipment.
• Follow current extinguishing capability of 50 kA rms for safe operation.
• Wide operating temperature range: -40 °C to +80 °C.
• Compact 4-pole design for space-saving DIN rail mounting.

Technical details

• SPD type: Type 1 + Type 2 combined arrester
• Network system: TT and TN-S
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal voltage (Un): 230 / 400 V AC
• Lightning impulse current (Iimp) per pole: 12.5 kA (10/350 µs)
• Lightning impulse current (Iimp) total: 50 kA (10/350 µs)
• Nominal discharge current (In) per pole: 20 kA (8/20 µs)
• Nominal discharge current (In) total: 80 kA (8/20 µs)
• Voltage protection level (Up) at Iimp: ≤ 1.5 kV
• Voltage protection level (Up) at In: ≤ 1.2 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Short-circuit withstand capability (Isccr): 50 kA rms
• Response time (tA): ≤ 100 ns
• Mounting type: 35 mm DIN rail
• Number of poles: 4
• Protection degree (housing): IP20
• Technology: Encapsulated spark gap
• Connection cross-section: 1.5 - 35 mm² solid / 1.5 - 25 mm² stranded

Our verdict

A high-performance combined arrester that meets stringent surge protection requirements with excellent follow current extinguishing and a wide operating temperature range.