Created by: Glen Zhu | Updated Date: March 7th, 2025
Isolation switch is a manually operated mechanical switch, primarily used to disconnect the load or power in a circuit to ensure that other parts of the circuit are not disturbed or exposed to danger during maintenance or repairs.
Different types of isolation switches are used for various applications. While their wiring methods are generally similar, there are still some differences in certain aspects.
This article provides detailed wiring diagrams (installation and connection) for AC isolation switches and DC isolation switches.
A DC isolator switch is used to safely disconnect the DC circuit, typically in solar PV systems. It should be installed near the solar array or inverter, preferably in a weatherproof enclosure. Before wiring, ensure the system is powered off. Connect the PV panel’s DC output to the isolator input and the isolator output to the inverter or charge controller, following correct polarity.
Wiring Diagram:
Wiring Diagram:
Wiring Diagram:
Wiring Diagram:
Wiring Diagram:
Application:
DC Isolator Switch is also widely used in photovoltaic systems, battery storage systems, telecommunication systems, and other applications. By using a single DC isolator switch, two array inputs can be managed, which not only saves costs but also reduces installation space.
The Single Phase AC Isolator switch is primarily installed before electrical equipment to ensure that the power can be completely disconnected during maintenance.
Wiring Diagram:
Applications:
The single-phase DC isolator switch is widely used in residential buildings, commercial buildings, and other locations to control and disconnect DC circuits, preventing electrical equipment from causing safety issues due to faults or maintenance.
The 3-phase AC isolator switch is typically installed before distribution panels, switchboards, or large equipment and transformers to ensure safe operation and maintenance.
Wiring Diagram:
Applications:
The 3-phase AC isolator switch is commonly used in industrial plants, commercial buildings, and areas that use three-phase power to supply high-power loads.
Following the wiring diagrams and installation procedures outlined in this guide will ensure reliable operation and compliance with electrical standards. Key points to remember:
1 . Safety First: Always disconnect power sources before installation and use appropriate personal protective equipment (PPE).
2 . Correct Wiring: Follow the wiring diagrams carefully, paying special attention to terminal numbers and polarity.
3 . Appropriate Selection: Choose the right type of isolator (AC/DC, single/three-phase, 2P/4P) based on the specific.
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