Eaton SPZT123-300/3+NPE-S Type 2 Surge Arrester for 40mm Busbar, 3+NPE, 300V, 20kA/40kA

Voltage spikes and transient overvoltages can silently damage sensitive electrical equipment, leading to costly downtime and repairs. The Eaton SPZT123-300/3+NPE-S surge arrester provides robust protection for three-phase power systems with neutral and protective earth, ensuring your installations remain safe and operational even under surge conditions. Designed for 40mm busbar mounting, this Type 2 (Class II) device is ideal for sub-distribution boards and industrial control panels where reliable surge protection is essential.

Who is it for

This surge arrester is intended for electricians, panel builders, and facility managers who need to protect three-phase electrical installations in commercial and industrial environments. It is particularly suited for TN-S and TT system configurations, where a dedicated neutral and protective earth are present. If your application requires a compact, busbar-mountable SPD with high discharge capacity and clear status indication, this model is an excellent choice.

Main features

• Type 2 surge protection according to IEC/EN 61643-11, suitable for sub-distribution boards.
• 3+NPE configuration protects all three phases, neutral, and protective earth.
• Nominal discharge current (In) of 20 kA per pole and maximum discharge current (Imax) of 40 kA per pole (8/20 µs waveform).
• Voltage protection level (Up) of less than 1.5 kV for both L-N and N-PE paths.
• Designed for 40mm busbar mounting, enabling quick and secure installation.
• Visual status indication: green for OK, red for replace.

Specifications

• Nominal voltage (Un): 230/400 V AC
• Max. continuous operating voltage (Uc): 300 V AC (L-N, N-PE)
• Short-circuit withstand capability (Isccr): 50 kA (with max. 125 A gG pre-fuse)
• Response time (tA): < 25 ns
• Operating temperature range: -40 to +80 °C
• Degree of protection: IP20
• Housing material: Thermoplastic, flame retardant
• Standards: IEC/EN 61643-11
• System configuration: TN-S, TT
• Energy coordination: Type 2

Tips

For optimal protection, install the surge arrester as close as possible to the power inlet of the equipment to be protected. Ensure that the busbar system is properly rated and that the device is installed by a qualified electrician in accordance with local regulations. Regularly check the status indicator to verify the protection status and replace the unit if the indicator shows red.