A modern electrical installation uses various devices to ensure safety - for people and devices. The basis for safe work with electricity is an isolating switch. How does this inconspicuous element work? When is it worth using? How does it differ from a circuit breaker? And which isolating switch to choose?
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How does an isolator switch work?
Isolation switches are used to control the flow of current, and more precisely, to safely, controlled disconnection of circuits from the power source. In most cases, mounted in the distribution box, they act as the main power switch. The switch disconnector is, as a rule, operated manually.
When we turn off the switch, we disconnect the circuit. The use of isolating switches has a significant impact on the safety of maintenance and repairs carried out within the installation. In emergency situations, e.g. in the event of a fire or electric shock hazard, the disconnector allows you to immediately cut off electricity in the entire house or in the switchboard. Once the danger has ended, we have the ability to quickly restore continuity.
When is it worth using an isolating switch?
The switch disconnector is a key element of the electrical installation, both in residential buildings, as well as in commercial facilities and production plants. This device plays a supplementary role, so it cannot be found in every distribution box, but it is worth using it if we want to safely perform installation work in the switchboard and be able to effectively respond to critical situations, such as a fire in the house. After turning off the switch, the only place in the switchgear with voltage will be the screw terminal with the connected phase conductor.
What types of switch disconnectors are there?
Isolation switches differ in terms of the parameters offered. The most frequently distinguished types concern the number of poles. So we have:
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1-pole disconnectors, - 2-pole switches,
- 3-pole disconnectors,
- 4-pole switches.
1- and 2-pole switch disconnectors are designed for single-phase installations, and 3- and 4-pole models for three-phase installations, where they provide disconnection of three phases at the same time or three phases and a neutral conductor (e.g. 3p+n switch disconnector ).
Isolation switches also differ in terms of the rated current they support, the degree of protection, short-circuit strength and several other technical parameters. Therefore, the selection of the appropriate isolating switch and its installation should be entrusted to a licensed electrician who will take into account the specificity of our installation, including the total current consumption in the circuit and other protections and system elements. Onninen wholesale specialists also provide support in the selection of disconnectors.
What is the difference between an isolator switch and a miniature circuit breaker?
Isolation switches are often confused with circuit breakers. No wonder - at first glance both cameras look very similar. However, they work differently and are used for different purposes.
The isolating switch is used to disconnect the power supply. The circuit is temporarily isolated from the supply voltage. The activation of the device is not influenced by the increase in current in the circuit. In the event of an overload or short-circuit current, the circuit should be interrupted not by an isolating switch, but by a miniature circuit breaker.
A circuit breaker (also known as a plug or fuse) protects the electrical installation and the devices connected to it against the effects of overloads and short circuits, e.g. fire. When a short circuit or electrical overload is detected, the circuit breaker will interrupt power to the circuit, preventing insulation from melting or damaging the wires to the loads.
The difference is also visible in the housing of the switch and circuit breaker. The switch only shows the current value, which will not damage the switch. However, there is no indication of the response characteristics because the device is turned on and off manually using the hand/fingers. The switch has a rated current marking (usually) B16. A fuse switch is also used to protect electrical installations, which combines the functional features of a switch and a fuse.
Isolation switches in the Onninen wholesaler
A reliable, properly selected and installed switch disconnector enables immediate disconnection of the circuit in emergency situations or for the purposes of maintenance or repair work. This is an investment in the safety of you and your electrical system.
At the Onninen electrical wholesaler , you will find a wide range of switch disconnectors that meet the highest quality and safety standards and are available at competitive prices. Based on knowledge and experience, we decide which products are likely to appear in the offer. We are committed to providing cameras only from proven manufacturers and brands. You can order from us, among others: Hager switch disconnector and Eaton switch disconnector . Our product range also includes many other control equipment products.