SSI's parallel connected medium voltage surge protective devices (1 kVRMS to 7.2 kVRMS) are engineered to protect mission critical systems during lightning strikes and transients that result from severe power system faults. Our surge protective devices allow your critical systems to stay up and running, keeping your electrical system from suffering extensive damage, extended downtime and lost revenue. This is critical to your company's well-being, bottom line and future.

The Most Advanced Medium Voltage Surge Protective Device Available Today

The Medium Voltage Arrester series of parallel connected surge protective devices represent the latest in surge protective device design and performance. By blending advanced computer circuit modeling with tried-and-true design principals learned over the past twenty-plus years, the Medium Voltage series has the lowest let-through voltage, providing the highest possible protection levels. Our Medium Voltage series has unmatched performance and safety, making it the best and most advanced Medium Voltage surge protective device available today!

 Available in the following Three Phase voltages:

1000NN, 1500NN, 2000NN, 2500NN, 3000NN, 3500NN, 4160NN, 7200NN (Wye Configurations Available Upon Request) 


   Standard Features                                                              Optional Features

5 Year Free Replacement Warranty                                               Integral Fused Manual Disconnect Switch
Manufactured at an ISO 9001: 2008 Certified Facility                    Integral Fused Option
Industry Leading Let-through Voltage Performance                       NEMA 12, 4, and 4X Enclosures
Circuit Encapsulation                                                                      Application Specific Design Modifications
Voltage Responsive Circuitry
Discrete "All Mode" Circuitry
Component Level Thermal Fusing
Peak Surge Current Levels From 80 kA To 160 kA per mode