ABB 2CDS631031R0204 BMS311C20 1P 20A 3kA C-Curve Basic M BMS Miniature Circuit Breaker

The ABB BMS311C20 (SKU: 2CDS631031R0204) is a 1-pole 20 A C-curve miniature circuit breaker from the Basic M BMS series, designed for reliable overcurrent and short-circuit protection in residential, commercial, and light industrial control panel applications. Rated at 230 V AC per IEC 60898-1 and 440 V per IEC 60947-2, it delivers a breaking capacity of 3 kA at 230/400 V AC, making the BMS311C20 a dependable choice for branch circuit protection across a wide range of installations. With a compact 17.5 mm width and a weight of just 93 g, this ABB miniature circuit breaker fits efficiently on standard DIN rail assemblies.

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 use
• IEC/EN 60664-1: Insulation coordination for equipment within low-voltage systems
• IEC/EN 60664: Insulation coordination standard for low-voltage equipment
• EN 60664: European adoption of IEC 60664 insulation coordination requirements
• IEC 60898: General circuit breaker performance and safety standard
• IEC 60947: Low-voltage switchgear and controlgear general requirements
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Registration, Evaluation, Authorisation and Restriction of Chemicals — EU compliant
• TSCA: Toxic Substances Control Act — US chemical safety compliance
• WEEE: Waste Electrical and Electronic Equipment Directive — compliant with EU recycling requirements

Applications & Use Cases

• Branch circuit protection in residential distribution boards and consumer units
• Commercial building electrical panels and switchboards
• Light industrial control panels requiring compact, single-pole protection
• Machine tool and automation cabinet wiring where DIN rail mounting is required
• Protection of motors, lighting circuits, and resistive loads with C-curve characteristic