Disconnect switch

Definition and Role of the Disconnect Switch

The disconnect switch combines two essential functions. It ensures the interruption of a circuit under load. It simultaneously guarantees visible contact insulation for operator safety. This dual function distinguishes it from a simple disconnect switch, which can only open under no-load conditions. It meets the requirement for in-line disconnection of the installation as defined by NF C 15-100.

Available Ranges and Ratings

Machine Control and Modular Mounting

The SIRCO M range covers ratings from 16 to 125 A. It mounts on a DIN rail. It is suitable for machine controls and compact distribution boards. Our installation experience confirms its suitability for extending existing cabinets.

Visible Break and Industrial Distribution

The SIRCO MV offers a visible break for ratings 100 to 160 A. The SIRCO, SIDER, and SIDERMAT ranges extend from 125 to 5000 A. They are installed at the back of the cabinet for industrial and commercial power distribution. The fully visible break allows the electrician to visually verify the contact separation.

Photovoltaic DC Disconnection

The SIRCO PV, SIRCO MC PV, and INOSYS LBS ranges are dedicated to photovoltaic installations. They support voltages up to 2000 VDC. They comply with EIA/IEC standards for DC disconnection.

Disconnection and Fuse Protection

FUSERBLOC and FUSOMAT combine disconnection and fuse protection. Current ratings reach 1250 A. This combination reduces cabinet space requirements.

Sealed Enclosure Versions

The S3 series offers IP65 plastic enclosures for surface mounting. The body and handles are made of reinforced polyamide and polycarbonate. The contacts are silver-plated copper.

Standards and Certifications

Socomec switch-disconnectors comply with IEC/IEC 60947-3. Some versions carry UL508 and UL98 certifications. AC-22 and AC-23 employment categories cover the most demanding industrial applications. Our commissioning tests show that this compliance is crucial for the acceptance of installations by regulatory bodies.

Accessories and Modularity

The range offers direct or external handles, auxiliary contacts, and control shafts. This modularity allows the same bare unit to be adapted to numerous configurations. It reduces the number of part numbers installers need to keep in stock.

Main Applications

These devices are found at the head of distribution boards, in emergency shut-off, and in safety isolation before maintenance. DC photovoltaic installations and industrial distribution are the main markets.

Frequently Asked Questions

What is the difference between a visible break and a fully visible break?

A visible break requires a contact gap that can be observed by the operator. A fully visible break adds a positive indication of the open position. The SIRCO MV guarantees a visible break. The standard SIRCO ranges provide a fully visible break.

Can a SIRCO M be used as a replacement for a machine control switch?

Yes, the SIRCO M is explicitly designed for this purpose. Its breaking capacity and DIN rail mounting make it compatible with existing control cabinets. Simply check the current rating and duty cycle required by the load.

Do the IP65 versions require an additional cabinet?

No. The S3 series in an IP65 plastic enclosure is self-contained for surface mounting. It is suitable for humid or dusty environments without the protection of a metal enclosure. The IP65 rating is integrated into the delivered housing.

Does FUSERBLOC replace a circuit breaker?

No. FUSERBLOC combines disconnection and fuse protection. It does not allow immediate reclosing after a fault like a circuit breaker. However, it offers a high breaking capacity and guaranteed disconnection that some circuit breakers do not have.

What rating should I choose for a 100 kW photovoltaic inverter?

The DC current depends on the module array voltage. At 1000 VDC, a 100 kW inverter delivers approximately 100 A. A SIRCO PV rated at 125 or 160 A is suitable with a safety margin. Check the maximum circuit voltage, which can reach 1500 VDC or even 2000 VDC depending on the configuration.