Dr Siemens circuit breaker 5SM1642-0 25A 300mA 400v
New product out of the manufacturer's box
Brand: Siemens
Model: 5SM1642-0
Circuit breaker operated by residual current, 4 poles, ac type, In: 25 a, 300 mA, Un ac: 400 v
A DR Circuit Breaker (Residual Differential) is an electrical protection device used to ensure safety against electrical shocks in residential and commercial installations. It is designed to detect leakage currents (earth leakage currents) and quickly interrupt the supply of electrical energy, avoiding possible damage to people and equipment.
The basic operation of a DR Circuit Breaker is based on the principle of current difference between the phase and neutral. It constantly monitors the current entering and leaving the electrical circuit. If there is a difference between these currents, the circuit breaker detects a leakage current and acts quickly to shut down the circuit.
When a person comes into contact with an energized conductor, an earth leakage current occurs, as part of the electrical current is diverted to the ground through the human body. The DR Circuit Breaker is sensitive to these leakage currents and is capable of identifying a minimum current difference, on the order of milliamps.
When detecting a leakage current, the Circuit Breaker switches off the electrical circuit in a very short time, generally less than 0.1 second. This quick response minimizes the risk of electrical shock and reduces the possibility of harm to health.
It is important to highlight that DR Circuit Breakers do not replace conventional Thermomagnetic Circuit Breakers, which are responsible for protecting circuits against overloads and short circuits. DR Circuit Breakers are installed together with Thermomagnetic Circuit Breakers and complement electrical protection, offering an additional level of safety against electric shocks.
In summary, a DR Circuit Breaker is an electrical protection device that detects earth leakage currents and quickly disconnects the electrical circuit, ensuring safety against electric shocks. It is widely used in residential and commercial installations where people's safety is a priority.
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