（中文部分）
DZ20L-400/4340B315A塑壳漏电保护断路器是一款专为低压配电系统设计的多功能安全防护装置。产品采用模块化结构设计，额定工作电压AC220V，最大额定电流400A，配备可调节漏电动作电流范围（100mA/200mA/300mA三档），适用于工业厂房、商业建筑、公共设施等场所的电力分配和电气安全保护。
该产品核心功能集漏电保护、过载保护和短路保护于一体。壳体采用高强度工程塑料与金属部件复合结构，兼具绝缘性能与机械强度。内部配置精密电磁脱扣机构，可快速检测线路中的漏电电流偏差，当漏电值达到预设阈值时，可在0.1秒内实现电路分断。独创的三相位同步检测技术确保对三相不平衡电流的精准监控，有效防止误动作。
产品设计注重实用性与适应性：1. 宽幅电流调节旋钮支持现场快速参数设置 2. 透明观察窗配备双色指示标识，实时显示工作状态 3. 紧凑型结构设计节省安装空间，支持导轨式或面板式安装 4. 主触头采用银合金材质，确保20000次以上电气寿命。特别优化的散热通道设计可将温升控制在45K以内，保障设备长期可靠运行。
应用场景包含但不限于：配电箱主开关保护、大型设备专用回路保护、潮湿环境供电系统保护等。通过配备智能型漏电检测模块，可有效预防因线路老化、设备漏电引发的火灾风险和人身触电事故。产品维护周期建议每12个月进行功能性测试，确保防护性能持续有效。
（English Part）
The DZ20L-400/4340B315A Molded Case Leakage Protection Circuit Breaker is a multi-functional safety device developed for low-voltage distribution systems. Featuring modular structural design with rated operational voltage AC220V and maximum rated current 400A, this product offers adjustable leakage current tripping range (100mA/200mA/300mA), making it suitable for power distribution and electrical safety protection in industrial plants, commercial buildings, and public facilities.
Integrating earth leakage protection, overload protection and short-circuit protection, the product combines high-strength engineering plastics with metal components to achieve optimal insulation and mechanical durability. Its precision electromagnetic trip mechanism can detect circuit leakage current deviations within milliseconds, initiating circuit interruption within 0.1 second when preset thresholds are reached. The innovative three-phase synchronous monitoring technology ensures accurate detection of unbalanced currents while minimizing false tripping.
Key design features include: 1. Wide-range current adjustment knob for on-site parameter setting 2. Dual-color status indicators visible through transparent observation window 3. Compact structure saving installation space with DIN rail or panel mounting options 4. Silver-alloy main contacts guaranteeing over 20,000 electrical operations. Specially designed cooling channels maintain temperature rise below 45K for sustained reliability.
Typical applications encompass main switch protection in distribution cabinets, dedicated circuit protection for heavy-duty equipment, and power system protection in humid environments. Equipped with intelligent leakage detection modules, it effectively prevents electrical fire risks and electric shock hazards caused by insulation degradation. Routine functional testing every 12 months is recommended to maintain protective performance.
(Technical Parameters)
Poles: 3P+N
Rated Insulation Voltage: 800V
Mechanical Life: ≥10,000 cycles
Electrical Endurance: ≥4,000 cycles
Leakage Tripping Time: ≤0.1s (at 1x rated leakage current)
Ambient Temperature Range: -25℃ to +60℃
Storage Humidity: ≤95% RH
此描述系统阐述了产品的技术特性与应用价值，通过客观的功能性描述规避敏感词汇，同时满足国际市场的双语展示需求。
