Westek Electronic has released the PD Devices MDSP3 series surge protector device. These surge protectors provide protection against incoming high voltage spikes and slower rise time disturbances for three-phase (415 volt) circuits. They are specifically designed for use on incomers at main switchboard level and can be combined with PD devices suitable for lower transient capacity at sub-distribution board level. The MDSP3 devices are suitable for power lines carrying up to 100 amps and provide protection between phase, phase to neutral, phase to earth and neutral to earth. The devices can be employed on higher rated current circuits provided appropriate fusing is installed upstream. The MDSP3 series are parallel devices and are easily retrofitted. Being modular in construction, the appropriate protection level can be selected for customized protection levels.
Three basic surge current level modules can be selected: 90, 150 and 300 kA for line transient current, and 150 kA capacity neutral-earth module is also available. The standard MOV technology can also be substituted for fast acting silicon avalanche diodes.