Disconnect switch

What is the function of a load break switch (isolator switch)?

The load break switch, also known as an isolator switch or disconnect switch, is a key device in any electrical installation.
Its main function is to isolate part of the electrical circuit to allow safe maintenance or repair work.

When set to the open position, it interrupts the current flow and provides a visible physical separation of contacts, ensuring operator safety.
These devices are widely used in industrial facilities, commercial buildings, and photovoltaic installations to protect both equipment and personnel.

How to choose a disconnect switch?

When selecting a load break switch, several criteria should be considered:

• Rated voltage: the device must match the voltage of your power supply.
• Rated current: the switch must handle the maximum expected current in your circuit.
• Number of poles: choose according to your system configuration (single-phase, three-phase, etc.).
• Mounting type: cabinet, enclosure, or DIN rail.
• Safety features: models with lockable handles or high IP protection to avoid accidental operation.
• Standards and certifications: compliance with IEC 60947-3 and the NF C 15-100 standard is essential for safe operation.

Which rating should you choose for a load break switch?

The proper rated current (amp rating) depends on the maximum current of your installation:

• Evaluate the rated current: calculate or verify the expected maximum current in your system.
• Keep a safety margin: select a switch with a slightly higher capacity to prevent overload.
• Follow manufacturer guidelines: check technical documentation to ensure compatibility with your electrical supply circuit.

Optim-Elec ranges of load break switches

At Optim-Elec, we provide a wide range of disconnect switches for industrial, commercial, and photovoltaic applications.

Socomec disconnect switches

• SIRCO M (16 – 125 A): for control and disconnection.
• SIRCO (125 – 5000 A): for power distribution.
• SIRCO PV (100 – 3200 A): designed for photovoltaic installations.
• INOSYS LBS (160 – 1600 A): for DC and PV applications.
• SIDER & SIDERMAT (125 – 3150 A): for energy distribution.

Socomec switches are robust, reliable, and fully compliant with international electrical installation standards.

Telergon disconnect switches

• F1 Series: DC switch up to 32A – 1500V, IP66 protection, ideal for photovoltaic systems.
• F7 Series: up to 55A, available in 2 to 10 poles, with lockable red handles for enhanced safety.
• S3 Series: AC load break switch mounted in a plastic enclosure, compliant with IEC 60947-3, designed for emergency cut-off in industrial and commercial environments.

Technical support and advice

For expert assistance in choosing the right disconnect switch for your electrical installation, our technical team is ready to guide you and provide tailored advice.