ABB 1SDA066560R1 A3N 400 TMF 320-3200 3p F F 320A 3-Pole Fixed Molded Case Circuit Breaker

The ABB 1SDA066560R1 (A3N 400 TMF 320-3200 3p F F) is a 320 A, 3-pole, fixed-mounted molded case circuit breaker (MCCB) from the Formula A3N range, ABB's compact and economical MCCB series for low-voltage distribution protection. It is fitted with a fixed thermal-magnetic (TMF) trip unit and is rated 36 kA Icu at 400 V AC. Weight is 4.85 kg.

Technical Specifications

Certifications & Standards

• CE: Complies with European Union directives for electrical equipment, confirming conformity with applicable EU safety, health, and environmental requirements.
• IEC: Designed and tested to International Electrotechnical Commission standards for low-voltage switchgear and controlgear.
• RoHS: Restriction of Hazardous Substances compliant, free from restricted levels of lead, mercury, cadmium, and other harmful substances.
• REACH: Compliant with EU REACH regulation governing the registration, evaluation, and authorisation of chemical substances.
• WEEE: Registered under the Waste Electrical and Electronic Equipment directive for responsible end-of-life recycling and disposal.

Selection Notes

• Rated current is 320 A with a magnetic trip (Im) of 3200 A; check it against the continuous load current of the circuit being protected.
• Icu is 36 kA at 400 V AC; confirm it is equal to or higher than the prospective fault current at the installation point.
• This is a 3-pole version for three-phase circuits; select a 4-pole variant if the neutral must be switched. Mounting is fixed (not plug-in or withdrawable).
• The TMF trip unit has fixed thermal and magnetic thresholds, so choose the rating that matches the load rather than relying on field adjustment.