ABB 1SDA066561R1 A3N 400 TMF 400-4000 3p F F 400A 3-Pole Fixed Air Circuit Breaker

The ABB 1SDA066561R1 A3N 400 TMF 400-4000 3p F F is a 400 A, 3-pole fixed-mount air circuit breaker from ABB's Formula A3N series, engineered for reliable overcurrent and short-circuit protection in low-voltage power distribution systems. The A3N 400 TMF 400-4000 3p F F features a thermomagnetic trip unit (TMF) with an adjustable current range of 400–4000 A, making it well-suited for main incoming, bus-coupler, and feeder protection in industrial switchgear panels. Compact dimensions of 139.5 mm × 205 mm × 103.5 mm and a weight of 4.561 kg deliver high performance within a space-efficient footprint.

Technical Specifications

Certifications & Standards

• CE: Complies with EU directives for low-voltage electrical equipment
• IEC: Designed and tested in accordance with IEC standards for low-voltage switchgear and controlgear
• RoHS: Restriction of Hazardous Substances compliant — free from restricted materials
• REACH: Compliant with EU REACH regulation on chemical substance safety
• WEEE: Registered under the Waste Electrical and Electronic Equipment directive for responsible end-of-life recycling

Applications & Use Cases

• Main incoming and bus-coupler protection in low-voltage switchboards and motor control centres
• Feeder circuit protection in industrial manufacturing plants and process facilities
• Power distribution panels in commercial buildings, data centres, and infrastructure projects
• Generator protection and tie-breaker applications requiring robust fixed-mount ACBs
• Upgrades or direct replacements within existing Formula A3N series switchgear installations