SURGE ARRESTER ELTAKO MUA-30 T1+T2+T3,3L+N+PE

Combined protection MUA-30 reliably protects electrical systems from transient overvoltages. Combines lightning current and overvoltage protection in a single device. Ideal choice for TN/TT networks with high overvoltage protection requirements. Simple DIN-rail mounting and modular design enable fast installation and maintenance. Combines Type 1, Type 2, and Type 3 overvoltage protection in one device, offering reliable protection against both direct lightning strike effects and building-wide transient overvoltages. MUA-30 is recommended when, for example, the cable length between the main/metering distribution board and the sub-distribution/distribution board exceeds 10 meters. If a building has an external lightning protection system, staged overvoltage protection must be implemented: Type 1 in the main/metering distribution board (e.g., MUA-100, MUA-50). Type 2 in sub-distribution/distribution boards (e.g., MUA-30, MUA-20). Type 2 overvoltage protection in a sub-distribution board is required only if the cable length from the main distribution board equipped with Type 1+2+3 overvoltage protection exceeds 10 meters. TECHNICAL DATA Grounding system TN/TT Rated voltage 230/400V Maximum operating voltage 275V Nominal discharge current 30kA Maximum discharge current 60kA Impulse discharge current 7.5kA/line Protection level 1.5kV Response time ≤ 25ns Overcurrent protective device (max.) 160A gL/gG Short-circuit withstand at maximum overcurrent 25kA Protection class IP20 Conductor terminals 35 mm² 4 modules = width 72 mm Spare module EM/MUA-30 (Serial No. 32 091 06) Overvoltage Protection Selection Guide Main Distribution Board / Metering Board Does the building have an external lightning protection system (class 3 or 4)? - Select MUA50. Does the building have an overhead line supply 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. Sub-distribution Board / Distribution Board Is the incoming supply cable to the sub-distribution board longer than 10 m? - Select MUA20. Is the incoming supply cable to the sub-distribution board shorter than 10 m? - Overvoltage protection is not required. This product description is an automated translation of the original Finnish description.