ABB 2CDS631031R0404 BMS311C40 1P 40A 3kA C-Curve 230V AC Miniature Circuit Breaker

The ABB BMS311C40 miniature circuit breaker (MCB), catalog number BMS311C40 and SKU 2CDS631031R0404, is a 1-pole 40A C-curve device rated at 230V AC (IEC 60898-1) and 440V AC (IEC 60947-2), offering a 3kA breaking capacity for reliable overcurrent and short-circuit protection in residential, commercial, and light industrial control panel applications. Part of the ABB Basic M BMS series, this compact MCB measures just 17.5mm wide and delivers dependable circuit protection with low power dissipation of 4.8W.

Technical Specifications

Certifications & Standards

• IEC 60898-1: Miniature circuit breakers for household and similar installations
• IEC 60947-2: Low-voltage switchgear — circuit breakers for industrial applications
• IEC/EN 60664-1: Insulation coordination for equipment within low-voltage systems
• IEC/EN 60664: Insulation coordination for low-voltage supply system equipment
• EN 60664: European harmonised insulation coordination standard
• IEC 60898: General requirements for circuit breakers for overcurrent protection
• IEC 60947: Low-voltage switchgear and controlgear standard family
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Compliant with EU REACH regulation on chemical substance safety
• WEEE: Compliant with EU Waste Electrical and Electronic Equipment Directive

Applications & Use Cases

• Overcurrent and short-circuit protection in residential distribution boards
• Light commercial electrical installations and sub-distribution panels
• Industrial control panels requiring compact 1-pole MCB protection
• Branch circuit protection in automation and electrical cabinets
• OEM machinery panel boards requiring IEC 60947-2 rated devices