ABB 2CDS631031R0105 BMS311B10 1P 10A B-Curve 3kA 230V DIN Rail Miniature Circuit Breaker (MCB)

The ABB BMS311B10 miniature circuit breaker (SKU: 2CDS631031R0105) is a 1-pole, 10A, B-curve MCB from the Basic M BMS series, rated at 230V AC per IEC 60898-1 and designed for reliable overcurrent and short-circuit protection in residential, commercial, and light industrial control panels. With a breaking capacity of 3 kA at 230/400V AC and compact DIN rail mounting dimensions of 17.5mm wide, the BMS311B10 delivers dependable protection in 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 (industrial applications)
• 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 insulation coordination requirements
• IEC 60898: General standard series for circuit breakers for overcurrent protection
• IEC 60947: General standard series for low-voltage switchgear and controlgear
• RoHS: Compliant — restriction of hazardous substances in electrical and electronic equipment
• REACH: Compliant — registration, evaluation, authorisation and restriction of chemicals (EU regulation)
• WEEE: Compliant — waste electrical and electronic equipment directive

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
• Protection of lighting circuits, socket outlet circuits, and small motor loads (B-curve)
• DIN rail installations requiring compact 17.5mm single-pole breakers

FAQ

• What does the B-curve mean for the BMS311B10? The B-curve trips the breaker at 3–5× the rated current for instantaneous protection, making it ideal for resistive and lightly inductive loads such as lighting and socket circuits.
• Is the ABB BMS311B10 compliant with IEC 60898-1? Yes. The BMS311B10 is fully certified to IEC 60898-1 for household and similar installations, as well as IEC 60947-2 for industrial applications.
• Can the BMS311B10 be used on a 400V system? Per IEC 60947-2, the rated voltage extends to 440V, giving it flexibility for industrial 3-phase distribution systems when used as a single-pole device.