ABB OVR ZP+ 3N 12.5-255 Type 1+2 Surge Protective Device, 3P+N, 12.5 kA, 255 V, TT/TN-S 2CTB815799R1900

Electrical surges from lightning or switching operations can destroy sensitive equipment in TT and TN-S earthing systems. The ABB OVR ZP+ 3N 12.5-255 is a combined Type 1+2 surge protective device that diverts high-energy transients to ground, protecting your installation from damage and downtime.

Who is it for

Electricians and panel builders who need reliable surge protection for three-phase power distribution with neutral, especially where lightning currents are a risk and remote monitoring is required.

Main features

• Combined Type 1+2 (Class I+II) protection per IEC/EN 61643-11
• 3P+N configuration for TT and TN-S systems
• High discharge capacity: 12.5 kA (10/350 µs) per pole
• Maximum continuous operating voltage 255 V AC
• Low voltage protection level ≤1.5 kV for both L-N and N-PE
• Remote signaling via auxiliary contact
• DIN rail mounting, 4 modules wide

Specifications

• Nominal discharge current (8/20 µs): 12.5 kA per pole
• Impulse current (10/350 µs): 12.5 kA per pole
• Short-circuit withstand: 50 kA with external backup fuse
• Integrated backup fuse: No (requires external 125 A gG)
• Protection technology: Varistor (MOV) + spark gap (GDT)
• Response time: < 25 ns
• Degree of protection: IP20
• Operating temperature: -40 to +80 °C
• Module width: 4 modules (72 mm)

Tips

Install this SPD as close as possible to the incoming supply, keeping leads short and straight to minimize let-through voltage. Ensure the external backup fuse is sized correctly to maintain short-circuit coordination.