Noark Surge Protective Device Ex9UE2 T2 4P 275V 1.4KV 20/40KA

Surge arrester, formerly lightning arrester (also surge protector, varistor) - a device designed to protect electrical apparatus against transient overvoltages, limiting the duration and frequency of the consequent current.

• Overvoltages can occur during, for example, switching on or off an unloaded overhead line or when lightning strikes an overhead line, and can damage the insulation and other network components.
• As lightning arresters are relatively expensive devices, they are only used to protect important network components such as a transformer or generator.

A line of surge arresters consists of Class 2 devices.

• They are designed to protect against overvoltages caused by transient fast switching operations or indirect lightning surges.
• It is recommended to install the devices every 10 - 20 m of cable length, in main switchboards as well as in sub-switchboards. The Ex9UE2 20 440 is designed for coordination with class 1 of the Ex9UE1 35 line, in the case of Ex9UE2 20 275, coordination with the Ex9UE1 35 line is by means of a 10 m long cable.
• The design of the Ex9UE2 arresters is based on varistor elements.
• It provides a low response time.
• The modular design with replaceable insertion allows quick and simple replacement of the functional modules in case of burnout, due to the frequent occurrence of surge peaks.

• Rated discharge current (8/20): 20
• Tripping indication on the device: Optical
• Type 2: YES
• Degree of protection (IP): IP20
• Max. cross-section of flexible cable: 35
• Protection level: N-PE
• Integrated protection: NO
• Network circuit : TN-S
• Size: 4 modules
• With contact for remote signalling: NO
• Maximum permanent operating voltage AC: 275
• Short-circuit resistance: YES
• Rated AC voltage: 275
• Mounting method: DIN rail TH-35 mm
• Max. conductor cross-section (single/multi-strand): 35
• Protection level L-N : 1.4
• Number of poles : 4
• Dimensions (W × H × D): 70 x 84 x 70 mm
• Noark product code: 103357