ABB 1SDA066570R1 A3S 400 TMF 320-3200 4p F F InN=100%In 400A 4-Pole Fixed Power Circuit-Breaker

The ABB 1SDA066570R1, catalogued as A3S 400 TMF 320-3200 4p F F InN=100%In, is a 400 A 4-pole fixed-mount power circuit-breaker from the Formula DSA A3 series, engineered for reliable protection of transformers, generators, and installation networks. With a TMF thermomagnetic release adjustable from 320 A to 3200 A and a neutral protection set at 100% In, this breaker delivers precise overcurrent and short-circuit protection across demanding industrial applications. Its compact fixed design — 186 mm wide × 205 mm tall — makes it ideal for space-efficient panel builds.

Technical Specifications

Certifications & Standards

• CE: Compliant with European Union electrical safety and EMC directives
• IEC: Designed and tested in accordance with IEC standards for power circuit-breakers
• RoHS: Restriction of Hazardous Substances — free from restricted toxic materials
• REACH: Compliant with EU REACH chemical safety regulation
• WEEE: Registered under the Waste Electrical and Electronic Equipment directive for responsible disposal

Applications & Use Cases

• Transformer protection in industrial power distribution panels
• Generator protection for standby and prime power systems
• Main installation protection in low-voltage switchgear assemblies
• 4-pole applications requiring full neutral pole switching (InN = 100% In)
• Control panels requiring compact fixed-frame moulded case circuit-breakers