Automatic changeover switch using contactors:
This diagram shows how to make an automatic changeover switch using contactors. In this circuit, we use an FP MCB ( Four Pole Minature Circuit Breaker ), two magnetic contactors, a selector switch, and a 3-phase motor. First, we need to connect FP MCB with a power source, then connect the magnetic contactor with FP MCB, then connect the selector switch and Motor with the power source.
Diagram of automatic changeover switch wiring:
Components Need for this Project:
You can get the components from any of the sites below:
- TP MCBÂ [See Buy Click Amazon]
- Contactor [See Buy Click Amazon]
- Selector Switch [See Buy Click Amazon]
- 3 Phase Motor [See Buy Click Amazon]
Read Also:
Components used to make the changeover switch:
01. TP MCB
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| Fig 2: TP MCB |
Three wires can be controlled by a triple pole MCB. Triple pole MCB circuit breakers are generally used in three-phase lines. A triple-pole MCB circuit breaker has three wires at its input and three wires at its output. But one can use this circuit breaker in a single-phase line. TP MCB widely used in industries. The reason is that it has three poles. And this TP circuit breaker is used to provide three-phase and three-phase connections. A neutral is not normally used in three-phase lines. But a 4-pole MCB circuit breaker is used if needed.
02. ContactorÂ
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| Fig 3: Contactor |
A magnetic contactor is an electrical device used for load control, automation, and protection. It is much like a magnetic reel. However, relays are generally used for low power and voltage, on the other hand, when we think of high power, these heavy-duty contractors only come to mind. It basically works by switching the load on and off. It has 3 terminals whose inputs are denoted as L1, L2, L3, and outputs as T1, T2, and T3. The circuit of the load is made in automation mode or protection using auxiliary contacts. It has two types of terminals. 1) Normally Open (NO). 2) Normally Closed (NC)
03. Selector Switch
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| Fig 4: Selector Switch |
Selector Switches Can be Rotated left, Right, or in The Center in Order to Open or Close The Electrical Contacts. The Function of a Selector Switch is To Control Devices as well as Switch Between a Minimum of Two or More Circuits. The perfect Use For a Selector Switch is When Used for Controlling an Output of a Device. Selector Switches Come as a Complete Unit Often listed as a Terminal Block Meaning the Selector Switch is a Complete Block Which Makes it Simple And easy to Install.
04. 3 Phase Motor
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| Fig 5: 3 Phase Motor |
A Three-Phase Motor is an Electric Motor That Typically Receives its Power From a Three-Phase System (three-phase current) This can be realized via a Three-Phase Mains Supply or a Frequency Inverter. Three-Phase Motors are Available as Synchronous and Asynchronous Motors. Three Phase Alternating Current Power Motor is Economical to Supply Power to the data Center Since it Requires Less Conductor Material to Supply Electricity. This Explains Why 3 Phase Alternating Current Motor is Used in Electric Transmission, Generation, and Distribution in Most Countries Worldwide.
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