ABB 2CDS632031R0404 BMS312C40 2P 40A 3kA C-Curve 400V AC Miniature Circuit Breaker

The ABB BMS312C40 miniature circuit breaker (SKU: 2CDS632031R0404) is a 2-pole, 40A, C-curve MCB from the Basic M BMS series, rated at 400V AC with a breaking capacity of 3 kA per IEC 60898-1. Designed for residential, commercial, and light industrial control panel applications, the BMS312C40 delivers reliable overload and short-circuit protection in a compact 35mm × 88mm × 69mm DIN-rail mount housing weighing just 186g.

Technical Specifications

Certifications & Standards

• IEC 60898-1: Household and similar installations — miniature circuit breakers
• IEC 60947-2: Low-voltage switchgear and controlgear — circuit breakers
• IEC/EN 60664-1: Insulation coordination for equipment within low-voltage systems
• IEC/EN 60664: Insulation coordination for low-voltage supply systems
• EN 60664: European harmonised insulation coordination standard
• IEC 60898: Circuit breakers for overcurrent protection in household and similar installations
• CE: Conformité Européenne — meets EU safety, health, and environmental requirements
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Registration, Evaluation, Authorisation and Restriction of Chemicals — EU compliant
• WEEE: Waste Electrical and Electronic Equipment Directive — compliant disposal
• TSCA: Toxic Substances Control Act — US chemical compliance

Applications & Use Cases

• Overload and short-circuit protection in residential distribution boards
• Commercial building electrical panel protection
• Light industrial control panel branch circuit protection
• DIN rail mounted switchgear assemblies up to 400V AC
• Final circuit protection in low-voltage switchgear and controlgear assemblies