Accessoiries

A bare switch-disconnector installed in an electrical panel can be completed and made safer with dedicated accessories. These other accessories include pre-break and signalling auxiliary contacts, terminal covers and protective shields, door-mounting kits, and spare parts such as fuses. They meet IEC 60947-3 compatibility requirements and cover ratings of up to 2500 A for terminal shields.

Types of accessories available for switch-disconnectors

Pre-break and signalling auxiliary contacts

Auxiliary contacts of the M and O+F types provide pre-break and device-status signalling functions. Our installation experience confirms that these elements are essential for interlocking and remote supervision in distribution panels. They fit onto existing switch-disconnectors without requiring replacement of the whole device.

Terminal covers and protective shields for personal safety

Upstream and downstream terminal covers made of insulating plastic prevent direct contact with live parts under voltage. Terminal shields, available for ratings from 1000 to 2500 A, provide an additional barrier during maintenance work near the device. Our installation feedback shows that these protections are frequently specified when bringing existing panels up to standard, in line with personal-safety requirements.

Mounting kits and spare parts

Door-mounting kits make it easier to mechanically adapt switch-disconnectors to panel configurations. Dedicated replacement fuses, notably for the DDMM FUSOMAT and FUSERBLOC ranges, maintain continuity of service without changing the whole device. Our standard practice favours this type of intervention to extend the service life of installations while keeping costs under control.

Materials and technical compatibility of accessories

Composition of protective and connecting elements

Terminal covers and protective shields are made of insulating plastic that meets dielectric strength requirements. Auxiliary contacts use silver-plated copper contacts to ensure the reliability of control and signalling circuits. These materials are selected to withstand operating conditions inside the electrical panel, particularly heating and electromagnetic stresses.

Regulatory compliance and interoperability

All these other accessories are designed to be compatible with switch-disconnectors complying with the IEC 60947-3 standard. This interoperability guarantees that the switching and current-withstand characteristics of the device-plus-accessories assembly are maintained. In the field, we find that this modular approach considerably simplifies maintenance and upgrade work on existing installations.

Applications and use cases in maintenance and compliance

Other accessories for switch-disconnectors have their main application in three operational contexts. Preventive and corrective maintenance uses spare parts to restore the device's original performance. Safety compliance work integrates terminal covers and protective shields to meet regulatory changes on protection against direct contact. Functional customisation adds auxiliary contacts or adapts the mounting to meet new supervision needs without fully replacing the equipment.

Frequently asked questions

What is the difference between pre-break contacts and signalling contacts for a switch-disconnector?

Pre-break contacts open the auxiliary circuit before the main poles break, allowing a downstream circuit breaker to trip. Signalling contacts simply indicate the open or closed position of the device without any prior action on another switching device.

Can terminal covers be added to a switch-disconnector already in service?

Installing terminal covers on an existing device requires the circuit to be de-energised and the absence of voltage to be verified beforehand. Feedback from installers confirms that this operation is carried out during planned shutdowns, as part of compliance work or a panel overhaul.

Are DDMM FUSOMAT and FUSERBLOC fuses interchangeable with other types?

Dedicated replacement fuses are sized to match the breaking characteristics and fuse-carrier dimensions of the FUSOMAT and FUSERBLOC ranges. Using fuses not specified by the manufacturer invalidates IEC 60947-3 compliance and may compromise the safety of the installation.

Which ratings are covered by terminal shields?

Terminal shields are available for switch-disconnectors rated at 1000 A, 1600 A, 2000 A and 2500 A. They are positioned between the upstream and downstream terminals to prevent accidental contact during nearby work.