WEI VPU ZPA S I 3+1 RA 300/7.5 Lightning Current Arrester for Power Networks

Type 1 lightning current arrester with spark gap technology, engineered for 3+1 configurations in TN-S and TT power networks. Its core strength lies in safely discharging impulse currents up to 7.5 kA (10/350 µs) per pole, providing robust protection against direct lightning strikes at the service entrance.

Advantages

Spark gap technology ensures extremely low voltage protection levels (≤1.5 kV) and high follow current extinguishing capability (50 kA rms). The integrated remote signaling contact enables proactive monitoring, while the compact DIN rail design simplifies installation in distribution boards. Thermoplastic flame-retardant housing guarantees durability and safety.

Suitable for

• Main distribution boards in residential and commercial buildings
• Industrial power supply systems requiring Type 1 surge protection
• TN-S and TT earthing systems with 3+1 circuit configuration
• Applications demanding remote status monitoring via signaling contact

Key specifications

• SPD type: Type 1 / Class I
• Network configuration: 3+1 (TN-S, TT)
• Max. continuous operating voltage (Uc): 300 V AC
• Nominal discharge current (In): 20 kA (8/20 µs) per pole
• Impulse current (Iimp): 7.5 kA (10/350 µs) per pole
• Total impulse current (Iimp total): 30 kA (10/350 µs)
• Voltage protection level (Up): ≤ 1.5 kV
• Follow current extinguishing capability (Ifi): 50 kA rms
• Short-circuit withstand capability (Isccr): 50 kA rms
• Response time (tA): < 100 ns
• Mounting: DIN rail 35 mm
• Remote signaling contact: Yes
• Operating temperature range: -40 °C to +80 °C
• Degree of protection: IP20
• Housing material: Thermoplastic, flame retardant
• Standards compliance: IEC 61643-11, EN 61643-11

Recommendations

For optimal protection, install this arrester at the main distribution board, as close as possible to the incoming supply. Ensure proper earthing and use an external backup fuse rated according to local regulations. Regularly inspect the status via the remote signaling contact to maintain system integrity.