ABB 1SDA066569R1 A3N 400 TMF 400-4000 4p F F InN=100%In 4P 400A Fixed Air Circuit Breaker

The ABB 1SDA066569R1 air circuit breaker, catalog number A3N 400 TMF 400-4000 4p F F InN=100%In, is a 4-pole 400 A fixed-mount low-voltage ACB from ABB's Formula DSA series, engineered for reliable overcurrent and short-circuit protection in demanding industrial power distribution systems. The A3N 400 TMF 400-4000 4p F F InN=100%In features a thermal-magnetic trip unit with a full 100 % rated neutral current (InN=100%In), making it ideal for installations with high harmonic loads or balanced four-wire networks. Compact at 186 × 205 × 103.5 mm and weighing just 6 kg, this ABB Formula A3N Series breaker delivers robust switchgear performance in a space-efficient fixed-mount format.

Technical Specifications

Certifications & Standards

• CE: Complies with European Union low-voltage and electromagnetic compatibility directives for unrestricted sale within the EEA.
• IEC: Designed and tested in accordance with IEC standards for low-voltage switchgear and controlgear.
• RoHS: Restriction of Hazardous Substances — free from lead, mercury, cadmium, and other restricted materials per EU Directive 2011/65/EU.
• REACH: Compliant with EU REACH regulation (EC No 1907/2006) regarding substances of very high concern (SVHC).
• WEEE: Registered under the Waste Electrical and Electronic Equipment Directive for responsible end-of-life recycling and disposal.

Applications & Use Cases

• Main incomer and feeder protection in low-voltage main distribution boards (MDBs) and sub-distribution boards
• Industrial switchgear panels requiring a fixed-mount 400 A air circuit breaker with thermal-magnetic trip
• Power distribution in manufacturing plants, data centres, commercial buildings, and infrastructure projects
• Four-wire network applications where full neutral protection (InN=100%In) is mandated by installation codes
• Generator set output protection and bus-tie applications in standby power systems
• Retrofit or upgrade of existing ABB Formula series panels requiring the A3N 400 TMF 400-4000 4p F F InN=100%In specification