INS/INV disconnect switch

What is a disconnect switch?

A disconnect switch is a switching device that isolates part of an electrical installation. By interrupting the flow of electrical current, it ensures safe conditions for maintenance work. These switches are generally installed at the incoming supply of an installation or inside electrical distribution boards.

Schneider Electric’s Interpact range offers two distinct technologies:

• INV models feature a visible break that guarantees total absence of current.
• INS models have a compact moulded enclosure without a visible break but remain equally effective for electrical isolation.

INV disconnect switches: maximum safety with a visible break

Interpact INV switches are the reference solution for applications where enhanced safety is critical. Their visible break makes it possible to immediately confirm the switch’s status and the absence of voltage. This feature reassures maintenance and repair teams during interventions.

At One-Elec, INV disconnect switches are available with rated currents ranging from 250 A to 2500 A. They are offered in 3-pole versions for three-phase installations and 4-pole versions with neutral disconnection. This adaptability makes them suitable for both industrial and commercial electrical systems.

The red rotary handle on the front ensures clear visual identification of the switch’s position. Its robust mechanism provides reliable performance even after numerous operations, while the well-designed housing integrates seamlessly into any installation.

INS disconnect switches: performance and cost-efficiency

Interpact INS switches, available from One-Elec, provide a cost-effective alternative to models with a visible break. Their compact moulded design saves space inside electrical panels. These disconnect switches are ideal for installations where a visible break is not required but reliable isolation is still essential.

The INS range also includes source selector versions, particularly useful for generator-equipped installations. These models enable safe transfer between normal and backup power supplies, with a built-in mechanical interlock preventing accidental parallel connection.

Rated currents are available up to 2500 A, making them suitable for demanding installations. Both DIN-rail mounting and direct fixing are possible, simplifying installation in different types of enclosures. The connection terminals allow quick, secure cable connections.

Applications and areas of use

INS/INV disconnect switches are widely used across multiple sectors. In industry, they are installed close to production machinery for safe local switching. Controlled mechanical ventilation (CMV) systems also rely on them to isolate motors.

In the service sector, these devices are integrated into distribution boards to secure maintenance on lighting and socket circuits. Air conditioners and mobile equipment equally benefit from this reliable protection. The emergency shut-off function can be vital in the event of an incident.

Electrical professionals particularly value their ease of operation. The ergonomic handle allows intuitive use, even when wearing protective gloves. In addition, compatibility with padlocking systems further enhances safety during maintenance.

Selection criteria and technical specifications

The choice between INV and INS mainly depends on the level of safety required by the installation. High-risk environments should favour INV models with a visible break, while standard applications can benefit from the cost-effective INS versions without compromising on reliability.

The rated current is another key selection factor, depending on the power of the installation. Three-pole versions are suited for standard three-phase systems, whereas four-pole versions include neutral disconnection for complete isolation.

Some models integrate a reversing function, simplifying installations with multiple power sources. These compact designs replace several separate devices while ensuring safe interlocking. Their reduced size helps optimise panel space.

Installation and commissioning

Installing INS/INV disconnect switches requires compliance with best practices and applicable standards. Placement must allow easy access for operation and maintenance. DIN rail mounting facilitates integration into standard electrical enclosures.

Cables are connected to the designated terminals with the recommended tightening torque. Conductor size must match the device’s rated current. Proper circuit labelling ensures easy identification for future work.

Commissioning includes both mechanical and electrical checks. Functional tests verify correct mechanism operation, while continuity and insulation tests are carried out in line with standard procedures.

Maintenance and durability

Interpact disconnect switches are built to deliver reliable performance over many years. Their durable mechanism withstands a high number of operations without premature wear. Preventive maintenance is limited to a few simple periodic checks.

Regular cleaning of the housing and handle maintains a neat appearance. Checking the tightness of electrical connections prevents overheating, while inspecting mechanical operation helps detect potential issues before they become serious.

Accessories and additional options

The Interpact range also includes accessories to optimise switch use. Waterproof enclosures with a red handle, available in our online store, are designed for harsh environments with moisture or dust, ensuring long service life.

Lockout systems increase safety during maintenance by preventing accidental operation while work is in progress. When combined with lockout tags, they provide a complete safety solution.

Offset handles make it easier to operate switches installed in hard-to-reach areas, improving ergonomics without compromising safety. These accessories provide the flexibility needed to adapt to specific project requirements.

Choosing Schneider Electric INS/INV disconnect switches from One-Elec means choosing reliable equipment that ensures the safety of your electrical installations. For more information, please contact our technical team.