ABB 1SDA054478R1 T5N 400 TMA 400-4000 4p F F InN=100%In 400A 4P Fixed Power Circuit Breaker

The ABB 1SDA054478R1 T5N 400 TMA 400-4000 4p F F InN=100%In is a 400 A, 4-pole fixed-mount moulded case power circuit breaker from the ABB Tmax T5 series, engineered for transformer, generator, and installation protection in demanding industrial environments. The T5N 400 TMA 400-4000 4p F F InN=100%In features a thermomagnetic TMA release with a full-neutral configuration (InN=100%In), delivering precise overcurrent and short-circuit protection across all four poles. Compact and robust, it fits into standard distribution boards and control panels where reliable power protection is critical.

Technical Specifications

Certifications & Standards

• CE: Complies with European Union directives for electrical equipment safety and electromagnetic compatibility
• IEC: Designed and tested in accordance with IEC standards for circuit breakers and protective devices
• RoHS: Restriction of Hazardous Substances compliant — free from restricted materials per EU Directive 2011/65/EU
• REACH: Compliant with EU REACH regulation (EC No 1907/2006) on chemical substance safety
• WEEE: Registered under the Waste Electrical and Electronic Equipment directive for responsible end-of-life recycling

Applications & Use Cases

• Transformer secondary-side protection in industrial power distribution systems
• Generator output protection for standby and prime power applications
• Main and feeder protection in large commercial and industrial installations
• Control panel and switchboard incomer protection requiring 4-pole switching with full neutral
• Suitable for data centres, manufacturing plants, infrastructure facilities, and utility substations