DEHN DSH ZP B2 SG TT 255 Combined Arrester Type 1+2+3 (909396)

Combined surge protective device (SPD) Type 1+2+3 with spark gap technology for TT and TN-S earthing systems. Protects low-voltage power supplies from lightning currents and surges with a total impulse current of 25 kA (10/350 µs) and a voltage protection level of ≤1.5 kV.

Advantages

Spark gap technology ensures high follow current extinguishing capability up to 50 kA rms and short-circuit withstand of 50 kA rms. Suitable for main power supply and meter cabinet installation on 35 mm DIN rail.

Suitable for

• TT earthing systems
• TN-S earthing systems
• Main power supply protection
• Meter cabinet (Zählerschrank) installation

Key specifications

• SPD Type: Type 1 + Type 2 + Type 3
• Max. continuous operating voltage (Uc): 255 V AC
• Nominal discharge current (In) (8/20 µs) L-N: 20 kA
• Impulse current (Iimp) (10/350 µs) L-N: 7 kA per pole
• Total impulse current (Iimp) (10/350 µs): 25 kA
• Voltage protection level (Up) L-N: ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Short-circuit withstand capability (Isccr): 50 kA rms
• Response time (tA): ≤ 100 ns
• Number of poles: 3+1 (for TT system)
• Mounting type: 35 mm DIN rail
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Technology: Spark Gap (SG)
• Housing material: Thermoplastic
• Standards compliance: EN 61643-11

Recommendations

Install in the main power supply or meter cabinet to protect electrical installations from direct lightning strikes and surges. Ensure proper earthing and follow EN 61643-11 requirements.