ABB 2CDS632031R0204 BMS312C20 2P 20A 3kA 400V AC Miniature Circuit Breaker MCB

The ABB BMS312C20 miniature circuit breaker (MCB), reference 2CDS632031R0204, is a 2-pole, 20A device from the ABB Basic M BMS Series designed to provide reliable overcurrent and short-circuit protection in residential, commercial, and light industrial control panel applications. Rated at 400V AC per IEC 60898-1 with a breaking capacity of 3 kA, the BMS312C20 offers dependable protection in a compact 35mm × 88mm × 69mm DIN rail-mount form factor weighing just 186 g.

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
• IEC/EN 60664-1: Insulation coordination for equipment within low-voltage supply systems
• IEC/EN 60664: Insulation coordination standard for low-voltage equipment
• EN 60664: European standard for insulation coordination in low-voltage systems
• IEC 60898: General requirements for miniature circuit breakers
• CE: Conformité Européenne — meets EU safety, health, and environmental protection requirements
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Compliant with EU Regulation (EC) No 1907/2006 on chemical substances
• TSCA: Compliant with the US Toxic Substances Control Act
• WEEE: Waste Electrical and Electronic Equipment Directive compliant — supports responsible recycling

Applications & Use Cases

• Overcurrent and short-circuit protection in residential and commercial distribution boards
• Control panel wiring protection in light industrial automation systems
• Branch circuit protection for machinery and electrical sub-panels
• DIN rail installation in compact enclosures where space efficiency is required