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Mersen Fuse Switch Disconnector

In the realm of electrical network protection and distribution, precision and reliability are paramount. MULTIBLOC® and MULTIVERT® Fuse Switch Disconnectors by Mersen are designed with meticulous attention to detail. These products offer a comprehensive solution for a myriad of applications, from house/building incoming units to industrial control cabinets and beyond. Whether it's the compact yet robust design, the seamless integration with existing systems, or the advanced functionality such as fuse monitoring and padlocking, MULTIBLOC® and MULTIVERT® stand as beacons of innovation in the field.

MULTIBLOC® series size 000, ST9, and RST9

The production programme of MULTIBLOC® 000.RST9 comprises NH fuse switch disconnectors for 125A. Products are designed in triple pole units for direct installation on to 60mm bus bar systems. For installation of MULTIBLOC® NH fuse switch disconnectors of different sizes in distribution units with central cover, respective covers are used to obtain a uniform profile in height and length. MULTIBLOC® size 000 are designed for NH fuse-links in accordance with IEC/EN 60269-2, VDE 0636-2. The system is a modular system, which allows the installation and combination of individual components. MULTIBLOC® offers the user the possibility of fast and easy installation as well as a high degree of security during installation and maintenance.

Key Features and Benefits

  • Compact - Safe - User Friendly

  • Compliant with IEC/EN 60947-3

  • 2 mounting systems: Baseplate mounting, 60mm busbar mounting

  • Screw mounting solution for high contact performance

  • AC Application at 690VAC

  • 125A rating up to 500VAC

  • Easy and safe operation (up to IP30 touch protection)

  • Safe switching at short circuit current 80kA

  • Low Power dissipation for improved heat management

  • Padlocking / Sealing system

  • Fuse monitoring availability

  • Microswitch available for opening detection

  • Long service life


  • House/Building incoming units

  • Small power distribution panels up to 630A

  • Industrial control cabinets

  • Transmitting stations for telecommunications

MULTIVERT and MULTIBLOC 800VAC for PV applications

Mersen new NH Fuses & FSDs are specifically designed to answer the requirements of protection and distribution of electric networks in the combiner boxes on the AC side of the new string inverters with rated operational voltage of 800V AC.

Mersen is fully ready to support and protect the increased voltage solution for the AC side of the PV installation with fully approved Fuse Switch Disconnectors and corresponding NH Fuses.

MULTIVERT® NH vertical fuse switch disconnectors meet all functions of NH fuse switch disconnectors. They are designed for installation on to bus bars in triple pole arrangements. MULTIVERT® 800Vac range includes Size 1 Multivert rated at 160A and answers the specific needs of Photovoltaic application for using String inverters rated at 800Vac. Multivert 800Vac are used for installation on to 185mm bus bar systems. MULTIVERT® 800Vac are designed for NH fuse-links in accordance with IEC/EN 60269, VDE 0636, size 1: 160A. The system is a modular system, that allows the installation of the individual components. MULTIVERT® offers the user the possibility of fast and easy installation as well as a high degree of protection during installation and maintenance.


  • Power distribution and Motor protection

  • Photovoltaic application: Protection on lines of String inverters rated at 800Vac

Multivert i-Xtensio design

A user-friendly mounting solution for current transformers at the back of the Multivert. A more standard installation depth of 150mm, in line with market standard dimensions. A solution fully compatible with existing and future Industrial control systems and with the Smart Monitoring modules.

With this new design, Mersen makes a first step in more and more connected devices to make the Low Voltage grid more intelligent and to bring open data to the end-users.


  • Feed pillars

  • Transformer substations

  • Switchboards for industrial applications

  • Residential and industrial distribution units

Key Features and Benefits

  • Installation onto 185 mm bus bar system

  • Standard design with M 12 screws: M = 35 ±3Nm

  • Symmetrical switch - top/bottom cable terminal connection

  • Touch protection IP 30 with central cover

  • Varieties of cable termination: bolt, insert nut, V-terminal

  • Safe on load connection/disconnection in accordance with IEC 60947-3

  • Increased installation depth of 150mm

  • External Current Transformer mounting possibility

In partnership with Power-Flo Technologies, Mersen strives for a commitment to excellence and has a vision for a smarter, more connected future. Their MULTIVERT and MULTIBLOC fuse switch disconnectors do just that. With their compact, user-friendly design, compliance with rigorous standards, and a multitude of features aimed at enhancing safety and efficiency, these products offer unparalleled performance across a diverse range of applications. From small power distribution panels to photovoltaic installations and industrial control cabinets, Mersen's solutions stand ready to meet the evolving needs of modern electrical systems.


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