ABB 2CDS273001R0405 S203M-B40 3P 40A 10kA B-Curve 230/400V AC Miniature Circuit Breaker

The ABB S203M-B40 miniature circuit breaker (MCB), catalog number S203M-B40 and SKU 2CDS273001R0405, is a 3-pole, 40A, B-curve device from the S200M series delivering a 10 kA breaking capacity at 230/400V AC. Designed for residential and light commercial distribution boards, it provides reliable overcurrent and short-circuit protection for electrical installations where high breaking capacity in a compact DIN-rail form factor is essential.

Technical Specifications

Certifications & Standards

• IEC/EN 60898-1: International and European standard for circuit breakers for overcurrent protection in household and similar installations
• IEC/EN 60947-2: International and European standard for low-voltage switchgear — circuit breakers
• IEC 60898-1: IEC standard for overcurrent protection circuit breakers
• EN 60898-1: European harmonised standard for household circuit breakers
• IEC/EN 60898: Combined IEC/EN compliance for circuit breaker safety
• IEC/EN60898: Alternate notation — same IEC/EN 60898 compliance
• IEC 60898-1400: IEC 60898-1 variant at 400V rating
• IEC 60947-2440: IEC 60947-2 variant at 440V rating
• IEC 60068-2: Environmental testing standard for electrical/electronic equipment
• EN 60898: European standard for circuit breakers in household and similar installations
• EN 60947-2: European standard for low-voltage switchgear circuit breakers
• EN 45555: European standard for general requirements for the ecodesign of networked standby
• EN 60664: Insulation coordination for equipment within low-voltage systems
• EN 60898: European standard — circuit breakers for overcurrent protection
• EN 60947: Low-voltage switchgear and controlgear — European harmonised family standard
• UL 1077: UL standard for supplementary protectors for use in electrical equipment
• CSA: Canadian Standards Association certification
• RoHS: Restriction of Hazardous Substances — EU Directive 2011/65/EU compliant
• REACH: EU REACH regulation compliance — no restricted substances above threshold
• WEEE: Waste Electrical and Electronic Equipment Directive compliant
• CE: Conformité Européenne — meets EU safety, health, and environmental requirements
• UKCA: UK Conformity Assessed — meets UK market requirements post-Brexit

Applications & Use Cases

• Overcurrent and short-circuit protection in residential and commercial distribution boards
• Protection of lighting circuits, socket outlets, and general-purpose loads with moderate inrush current (B-curve)
• Industrial control panels requiring compact 3-pole DIN-rail mounted protection
• Sub-distribution boards in office buildings, retail premises, and light industrial facilities
• Replacement or upgrade of existing 3-pole MCBs in S200/S200M-compatible installations