ABB 2CDS253001R0205 S203-B20 3P 20A 6kA B-Curve 230/400V DIN-Rail Miniature Circuit Breaker

The ABB S203-B20 miniature circuit breaker (MCB), catalog number S203-B20 (SKU: 2CDS253001R0205), is a 3-pole, 20A, B-curve device from the S200 series designed to provide reliable overcurrent and short-circuit protection in industrial and commercial installations. Rated at 230/400V AC with a breaking capacity of 6 kA, it mounts directly to standard DIN rail and meets the stringent requirements of IEC/EN 60898-1 and IEC/EN 60947-2.

Technical Specifications

Certifications & Standards

• IEC/EN 60898-1: International and European standard for household and similar circuit breakers
• IEC/EN 60947-2: Low-voltage switchgear and controlgear — circuit breakers for industrial use
• UL 1077: Supplementary protectors for use in electrical equipment (North America)
• IEC 60898-1: Core IEC standard for miniature circuit breakers
• EN 60898-1: European adoption of IEC 60898-1
• IEC 60898-1400: Extended IEC 60898-1 application standard
• IEC 60947-2440: Extended IEC 60947-2 application standard
• IEC 60068-2: Environmental testing — climatic and mechanical durability
• EN 60947-2: European adoption of IEC 60947-2
• EN 45555: General methods for the assessment of the ability of energy-related products to be repaired, reused, upgraded, and recycled
• EN 60664: Insulation coordination for equipment within low-voltage systems
• CSA: Canadian Standards Association approval for North American markets
• CE: Conformité Européenne — meets EU safety, health, and environmental requirements
• UKCA: UK Conformity Assessed — meets Great Britain market requirements post-Brexit
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Compliant with EU REACH regulation on chemical substances
• WEEE: Compliant with EU Waste Electrical and Electronic Equipment Directive

Applications & Use Cases

• Overcurrent and short-circuit protection in industrial control panels and distribution boards
• Protection of resistive and slightly inductive loads (B-curve: trips at 3–5× rated current)
• Commercial building electrical installations — lighting circuits, HVAC, and general power
• Machine building and industrial automation wiring in 400V three-phase systems
• Secondary circuit protection downstream of moulded case circuit breakers (MCCBs)