ABB 2CDS631031R0504 BMS311C50 1P 50A 3kA Curve-C Miniature Circuit Breaker

The ABB BMS311C50 miniature circuit breaker (MCB), SKU 2CDS631031R0504, is a 1-pole, 50 A, Curve-C device 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 reliable overload and short-circuit protection in residential, commercial, and light industrial control panels, the BMS311C50 offers compact 17.5 mm DIN rail mounting and straightforward installation.

Technical Specifications

Certifications & Standards

• IEC 60898-1: Household and similar installations — circuit breakers for overcurrent protection
• IEC 60947-2: Low-voltage switchgear and controlgear — 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 equipment
• RoHS (EU Directive 2011/65/EU & Amendment 2015/863): Restriction of hazardous substances in electrical and electronic equipment
• REACH: EU regulation on registration, evaluation, authorisation and restriction of chemicals
• WEEE: EU Waste Electrical and Electronic Equipment Directive compliance

Applications & Use Cases

• Overload and short-circuit protection in residential distribution boards
• Commercial building electrical panels and final circuits
• Light industrial control panels and machinery protection
• Protection of single-phase loads, lighting circuits, and socket outlet circuits
• DIN rail assembly in compact enclosures where 17.5 mm width is essential