Main isolating disconnect switch IS-125/3 276288

Main isolation disconnect switch – reliable power disconnection

The IS-125/3 disconnect switch is a three-pole main isolation switch designed for safe and reliable disconnection of electrical circuits. A rated current of 125A and a high short-circuit breaking capacity (10kA) make it an ideal solution for both home and commercial installations. The device is characterized by a solid construction and high contact durability, which guarantees long-term and trouble-free operation.

Functionality and application

This modular disconnect switch, with a width of 3 modules, is primarily used as the main switch in electrical installations in distribution boards. Contact position indication allows for unambiguous visual verification of the circuit status – whether it is on or off. This allows the installer to quickly and easily check the correctness of the connections, and the end user to be sure that the circuit is safely disconnected during maintenance or emergency work. The use of characteristic C allows for the safe starting of devices with motors that generate high inrush currents.

Key features and benefits

• High short-circuit strength: the ability to withstand a short-circuit of 2kA and a short-circuit breaking capacity of 10kA protects the installation and devices from the effects of overvoltage and short circuits.
• Wide range of connection wires: the ability to connect wires with a cross-section of up to 50mm² facilitates installation and provides flexibility in choosing the appropriate cables.
• Contact durability: high contact durability to abrasion translates into a long service life of the device and minimizes the risk of failure.
• Safety of use: the degree of protection IP40 protects against accidental contact and the ingress of solid objects larger than 1mm, which increases safety of use.
• Modular construction: a width of 3 modules makes it easy to install in standard distribution boards.
• Reliable insulation: the lack of forced isolation according to DIN VDE 0113 does not affect its functionality as a main isolation switch, but it is worth considering when designing the installation.
• Clear indication: the presence of an “arrow” symbol on the housing makes it easier to identify the function of the device and quickly orientate in the circuit status.