Features: Capable of handling up to 6kA short circuits current, great for stable power systems. If a person suffers electric shock or the circuit breaker of the power supply exceeds the specified value, this product can turn off the residual current in a short time to protect personally safety and prevent the devices from failing due to the leakage current. Make of flame retardant ABS materials, which can bear extreme environmental conditions, with strong adaptability and reliable operation. Rail mounting: circuit breaker support standard rail mounting, compacts size, easy to install. The residual current circuit breaker can be used for rarely starting circuits and motors, and is widely used in various fields such as industry, trade, highly rise building and households. Specifications: Component: Plastic Size: about 7.7x5x4.50cm/3.03x1.97x1.77inch Current: 40A Polarity: 4P Voltages: 400V Breaking capacity: 6000A Package Includes: 1Pc Residual Current Circuit Breaker note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.