ABB 2CDS631031R0325 BMS311B32 1P 32A B-Curve 3kA 230V AC Miniature Circuit Breaker

The ABB BMS311B32 (SKU: 2CDS631031R0325) is a 1-pole, 32 A, B-curve miniature circuit breaker (MCB) from the Basic M BMS series, rated at 230 V AC per IEC 60898-1 and 440 V AC per IEC 60947-2, with a breaking capacity of 3 kA. Designed for residential, commercial, and light-industrial control panel applications, the BMS311B32 provides reliable overcurrent and short-circuit protection with a compact 17.5 mm wide DIN-rail-mounted footprint weighing only 93 g, making it an efficient choice for space-constrained enclosures.

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 for industrial use
• IEC/EN 60664-1: Insulation coordination for equipment within low-voltage supply systems
• IEC/EN 60664: Insulation coordination for low-voltage equipment
• EN 60664: European harmonised insulation coordination standard
• IEC 60898: General requirements for miniature circuit breakers
• IEC 60947: General rules for low-voltage switchgear and controlgear
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Compliant with EU chemical safety regulation (EC) No 1907/2006
• WEEE: Waste Electrical and Electronic Equipment Directive compliant

Applications & Use Cases

• Overcurrent and short-circuit protection in residential distribution boards
• Commercial building electrical panel protection
• Light-industrial control panel circuit protection
• Final circuit protection for lighting and socket outlet circuits (B-curve)
• DIN-rail mounted switchboard assemblies requiring compact 17.5 mm wide modules