Switch-disconnectors and circuit-breakers are two essential components in electrical installations, but they perform different functions. Here are the main differences between a switch-disconnector and a circuit-breaker:
Role and function of a switch-disconnector and a circuit-breaker
A switch-disconnector, also known as a disconnector, is a device that cuts off one or more electrical circuits, but does not switch or protect them. Its main purpose is to completely isolate an electrical circuit from the power source. It allows the power supply to be cut off safely for maintenance or repair work on equipment connected to the circuit.
The circuit breaker both protects and separates circuits. Its role is to protect the circuit against electrical overloads and short circuits. It detects electrical anomalies and automatically interrupts the current to avoid damaging equipment or causing fires.
The differences in terms of protection between a switch-disconnector and a circuit-breaker
Although it can cut off the power supply, the switch-disconnector does not provide protection against overloads or short circuits. Its main purpose is to ensure the safety of workers by isolating the circuit.
The circuit breaker provides active protection by detecting abnormal variations in current. It automatically interrupts the circuit in the event of an overload or short-circuit to prevent damage.
How do you activate a switch-disconnector and a circuit-breaker?
A switch-disconnector is usually activated manually. It requires physical intervention to open or close the circuit.
Circuit-breakers can be activated manually, but they are also equipped with automatic detection devices that react quickly in the event of an overload or short-circuit.
In what types of applications should a switch-disconnector and a circuit-breaker be used?
There are several types of switch-disconnector, including fuse, knife and rotary models. They are used to isolate specific parts of an electrical circuit in complete safety.
Circuit breakers are available in different types depending on their protection characteristics, such as thermal, magnetic and differential circuit breakers. They are used to protect residential, industrial and commercial electrical circuits.
In conclusion, although switch-disconnectors and circuit-breakers may seem similar as electrical control components, their function and role differ considerably. Switch-disconnectors are primarily intended to isolate circuits for safety reasons, while circuit-breakers protect circuits against overloads and short circuits. Choosing the right component depends on the specific requirements of each electrical installation.
Further information: How to choose a DC isolating switch for your photovoltaic installations?
