Delixi CDM3L Molded Case Circuit Breaker with Leakage Protection
Overview
The Delixi CDM3L series is a premium molded case circuit breaker (MCCB) integrating residual current protection (RCD). Manufactured by Delixi Electric, a leading Chinese electrical equipment producer, it meets IEC/GB standards for industrial and commercial applications. Designed for 50/60Hz AC circuits up to 400V, it protects against overloads (thermal), short-circuits (magnetic), and earth leakage currents. The compact design allows DIN rail or fixed mounting, with current ratings typically ranging from 16A to 630A.
Structure and Working Principle
The CDM3L comprises a robust thermoplastic case housing a bimetal thermal trip, electromagnetic trip, and zero-sequence current transformer for leakage detection. Under normal operation, current flows through phase and neutral conductors with balanced magnetic fields. During leakage faults (≥30mA), the current imbalance triggers the differential transformer, activating the mechanical trip mechanism within 0.1 seconds. The thermal-magnetic system responds to overloads (delayed trip) and short-circuits (instantaneous trip), while the RCD module provides supplementary personal protection.
Key Features
1. Triple Protection: Combines thermal-magnetic breaker functionality with Class A AC-type residual current detection (sensitive to pulsating DC). 2. Adjustable Sensitivity: Leakage trip threshold can be set between 30mA (personal protection) to 1000mA (equipment protection) via rotary dial. Breaking capacity reaches 10kA at 400V AC, suitable for demanding industrial environments.
Application Areas
Primary applications include: - Industrial plant distribution boards - Commercial building sub-circuits (especially wet areas) - Motor control centers requiring ground fault protection - Solar PV systems with DC component sensitivity Common installations pair CDM3L with contactors for remote switching while maintaining protection. It's particularly valued in food processing, water treatment, and healthcare facilities where electrical safety is critical.
Maintenance and Precautions
Monthly test-button operation is recommended to verify RCD functionality. Environmental conditions should remain within -5°C to +40°C with 95% RH max (non-condensing). Critical precautions: 1. Neutral conductor must pass through the current transformer 2. Avoid parallel neutrals that could cancel leakage signals 3. Periodic calibration (every 2 years) ensures accurate trip thresholds 4. Contamination by dust/oil may impair mechanical operation
B2B Procurement Guide
For bulk procurement, specify: 1. Current rating (e.g., CDM3L-250 for 250A) 2. Leakage sensitivity range (standard is 30-100-300-1000mA) 3. Number of poles (3P/4P) 4. Auxiliary contact requirements Lead times typically 2-4 weeks for customized configurations. MOQs start at 50 units for standard models. Verify certifications (CCC, CE, KEMA) based on target markets. Consider bundled purchases with compatible terminal kits and shunt releases.
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