SURGE ARRESTER ELTAKO MUA-50 T1+T2+T3,3L+N+PE,12,5KA

Combined protection device MUA-50 reliably protects electrical systems from transient overvoltages. It provides high-level protection against direct lightning strikes in TT, TN-C, and TN-S systems. Discharge current capacity: 12.5 kA per pole. Simple DIN-rail mounting and modular design enable quick installation and maintenance. Integrates Type 1, Type 2, and Type 3 surge protection into a single device, enabling comprehensive protection from the building's electrical connection all the way to the end equipment. The MUA-50 combined surge protector is recommended for new constructions and renovation projects featuring high-power electrical equipment (e.g., electric vehicle charging stations, air-source heat pumps, photovoltaic systems). If a building has an external lightning protection system, staged surge protection must be implemented: Type 1 at the main/distribution metering center (e.g., MUA-100, MUA-50). Type 2 at group/distribution boards (e.g., MUA-30, MUA-20). Type 2 surge protection at sub-distribution boards is required only if the cable length from the main board (equipped with Type 1+2+3 surge protection) exceeds 10 meters. TECHNICAL DATA Rated voltage AC (50/60 Hz): 240 V Maximum continuous operating voltage (AC) (L1-N)(N-PE): 300 V / 305 V Nominal discharge current (8/20 μs) (L-N)(N-PE): 20 kA / 80 kA Maximum discharge current (8/20 μs) (L-N)(N-PE): 50 kA / 100 kA Impulse discharge current (10/350 μs) (L-N)(N-PE): 12.5 kA / 50 kA Specific energy (L-N)(N-PE): 39 kJ/Ω / 225 kJ/Ω Charge capacity (L-N)(N-PE): 3.75 As / 15 As Combined protector open-circuit voltage: 6 kV Combined protector open-circuit voltage (L-N)(N-PE): 1500 V / 1500 V AC RMS current: 100 ARMS Response time (L-N)(N-PE): < 100 ns / < 100 ns Overcurrent protective device (max.): 160 AgG Short-circuit current rating (AC): 25 kA TOV withstand capability: 120 minutes at 442 V TOV withstand capability: 200 minutes at 1200 V According to EN 61643-11: Type 1+2+3 4 modules = width 72 mm Replacement module EM/MUA-50MOD (Serial No. 32 091 07) Replacement module EM/MUA-50GTD (Serial No. 32 091 08) (yellow) Surge Protector Selection Guide Main Board / Metering Board Does the building have an external lightning protection system (Class 3 or 4)? - Select MUA50. Does the building have an overhead supply line or is it located in a rural or sparsely populated area? - Select MUA30 or MUA50. Is the building located in a densely populated urban area? - Select MUA20. Group Board / Distribution Board Is the supply cable to the sub-distribution board longer than 10 m? - Select MUA20. Is the supply cable to the sub-distribution board shorter than 10 m? - No surge protection is required. This product description is an automated translation of the original Finnish description.