ABB 2CDS633031R0204 BMS313C20 3P 20A 3kA C-Curve 400V AC DIN Rail Miniature Circuit Breaker

The ABB BMS313C20 miniature circuit breaker (MCB), reference 2CDS633031R0204, is a 3-pole, 20A, C-curve device from the Basic M BMS series designed for reliable overcurrent and short-circuit protection in residential, commercial, and light industrial control panels. Rated at 400V AC per IEC 60898-1 and 440V per IEC 60947-2, the BMS313C20 delivers a breaking capacity of 3 kA at 400V AC, making it well suited to protecting circuits where moderate fault currents are expected. Its compact DIN rail mount form factor — 52.5 mm × 88 mm × 69 mm and weighing just 279 g — ensures easy installation in space-constrained enclosures.

Technical Specifications

Certifications & Standards

• IEC 60898-1: Standard for household and similar installations — circuit breakers for overcurrent protection
• 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 for low-voltage supply systems
• IEC 60898: General circuit breaker performance standard
• EN 60664: European harmonised insulation coordination standard
• RoHS: Restriction of Hazardous Substances — compliant with EU Directive 2011/65/EU
• REACH: Registration, Evaluation, Authorisation and Restriction of Chemicals — EU compliance
• TSCA: Toxic Substances Control Act — US chemical compliance
• WEEE: Waste Electrical and Electronic Equipment Directive — proper end-of-life disposal compliance

Applications & Use Cases

• Overcurrent and short-circuit protection in commercial and light industrial distribution boards
• Protection of motor branch circuits and control panel feeders up to 20A
• Machine building and OEM panel wiring requiring IEC 60947-2 rated devices
• Residential and small commercial installations where a C-curve characteristic is required
• DIN rail assemblies in automation cabinets, HVAC control panels, and building management systems