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The reference 2CTB803973R1100 is a surge arrester for energy/power supply. Its characteristics are: Mounting type: 35 mm hat profile rail, Construction size: 4 modular separation, Signaling on the device: Optical, Degree of protection (IP): IP20, Number of conductors (without ground): 4, Protection level: 1.5kV, Maximum continuous voltage AC: 275V, Rated discharge current (8/20): 20kA, Rated voltage AC: 230V, Type 2 test class, L-N protection level: 1.25kV , N-PE protection level: 1.4kV, Maximum cross-section of rigid conductor (single/multi-conductor): 25mm², Maximum cross-section of flexible conductor (fine stranded): 16mm². Product dimensions: Width 71.2 mm, Height 88 mm, Length 58 mm.