ABB 2CDS631031R0405 BMS311B40 1P 40A 3kA B-Curve 230V AC Miniature Circuit Breaker

The ABB BMS311B40 (SKU: 2CDS631031R0405) is a 1-pole, 40A, B-curve miniature circuit breaker (MCB) from the Basic M BMS series, rated at 230V AC per IEC 60898-1 and 440V AC per IEC 60947-2, with a breaking capacity of 3 kA. Designed for reliable overcurrent and short-circuit protection in residential, commercial, and light industrial control panel installations, the BMS311B40 delivers compact, DIN-rail-ready performance in a 17.5 mm wide form factor.

Technical Specifications

Certifications & Standards

• IEC 60898-1: Miniature circuit breakers for overcurrent protection in household and similar installations
• IEC 60947-2: Low-voltage switchgear and controlgear — circuit breakers
• IEC/EN 60664-1: Insulation coordination for equipment within low-voltage systems
• IEC/EN 60664: Insulation coordination for equipment within low-voltage supply systems
• EN 60664: European harmonised insulation coordination standard
• IEC 60898: Circuit breakers for overcurrent protection — general series standard
• IEC 60947: Low-voltage switchgear and controlgear — general rules
• CE: Conformité Européenne — meets EU safety, health, and environmental requirements
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Registration, Evaluation, Authorisation and Restriction of Chemicals — EU compliance
• WEEE: Waste Electrical and Electronic Equipment Directive — EU compliant disposal classification

Applications & Use Cases

• Overcurrent and short-circuit protection in residential distribution boards
• Commercial building electrical panel installations
• Light industrial control panels and machinery protection
• Single-phase circuit protection at 230V AC
• DIN rail mounting in compact enclosures (17.5 mm pitch)