ABB 2CDS631031R0255 BMS311B25 1P 25A 3kA B-Curve 230V AC Miniature Circuit Breaker MCB

The ABB BMS311B25 (SKU: 2CDS631031R0255) is a 1-pole 25A B-curve miniature circuit breaker (MCB) from the Basic M BMS series, rated at 230V AC per IEC 60898-1 and 440V per IEC 60947-2. Delivering a breaking capacity of 3 kA, this compact BMS311B25 unit is engineered for reliable overcurrent protection in residential, commercial, and light industrial control panel applications, housed in a slim 17.5mm wide DIN rail-mountable enclosure weighing just 93g.

Technical Specifications

Certifications & Standards

• IEC 60898-1: Standard for circuit breakers for overcurrent protection in household and similar installations
• IEC 60947-2: Standard for low-voltage switchgear and controlgear — circuit breakers
• IEC/EN 60664-1: Insulation coordination for equipment within low-voltage systems
• IEC/EN 60664: Insulation coordination standards for low-voltage installations
• EN 60664: European adoption of insulation coordination standard
• IEC 60898: General circuit breaker protection standard series
• IEC 60947: Low-voltage switchgear and controlgear standards series
• CE: Conformité Européenne — meets EU safety, health, and environmental requirements
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Compliant with EU REACH regulation on chemical substances (EC 1907/2006)
• WEEE: Waste Electrical and Electronic Equipment Directive compliant
• TSCA: Compliant with US Toxic Substances Control Act requirements

Applications & Use Cases

• Overcurrent and short-circuit protection in residential distribution boards
• Commercial building electrical panels and sub-distribution boards
• Light industrial control panels and machinery protection
• Branch circuit protection for lighting and socket circuits
• DIN rail installations in compact enclosures where a slim 17.5mm profile is essential