Eltako MUA-100 Modular Surge Arrester Type 1+2+3, 4-Pole, 12.5kA Impulse Current, DIN Rail

With a total impulse current of 50 kA (10/350 µs) and a voltage protection level below 1.5 kV, the Eltako MUA-100 delivers uncompromising defense against transient overvoltages for low-voltage power distribution systems. This modular surge arrester combines Type 1, 2, and 3 protection in a single 4-pole unit, making it ideal for installations where space and reliability are critical.

Overview

The Eltako MUA-100 (model 28380000) is a combined lightning and surge arrester designed for TN-S, TT, and TN-C network systems. It provides robust protection for 230/400 V AC installations, with a nominal discharge current of 20 kA (8/20 µs) per pole and an impulse current of 12.5 kA (10/350 µs) per pole. The device is engineered for DIN rail mounting (35 mm), occupying only 4 TE (72 mm) of width, and features visual status indication for quick fault detection.

What stands out

• Combined Type 1+2+3 protection in one compact module
• High impulse current withstand: 12.5 kA per pole (10/350 µs)
• Low voltage protection level (< 1.5 kV) for sensitive equipment
• Fast response time under 25 ns
• Wide operating temperature range from -40°C to +80°C
• Visual green/red status indication for easy monitoring

Technical details

• Protection type: Type 1+2+3 combined arrester
• Network systems: TN-S, TT, TN-C
• Nominal voltage (Un): 230/400 V AC
• Max continuous operating voltage (Uc): 280 V AC
• Nominal discharge current (In): 20 kA (8/20 µs) per pole
• Impulse current (Iimp): 12.5 kA (10/350 µs) per pole
• Total impulse current (Iimp total): 50 kA (10/350 µs)
• Voltage protection level (Up): < 1.5 kV
• Response time: < 25 ns
• Number of poles: 4-pole (3P+N)
• Mounting type: DIN rail (35 mm)
• Module width: 4 TE (72 mm)
• Short-circuit withstand capability (Isccr): 50 kA
• Max backup fuse: 160 A gG
• Operating temperature range: -40°C to +80°C
• Status indication: Visual (green/red)
• Protection class: IP20

Our verdict

The Eltako MUA-100 is a high-performance surge protection solution for demanding electrical installations. Its combined Type 1+2+3 classification, high discharge capacities, and compact design make it a reliable choice for protecting sensitive equipment against lightning and switching overvoltages.