The MULTIVERT® Size 2 400A NH fuse-switch disconnector delivers robust and reliable protection in demanding industrial environments, supporting 1×3-pole switching for safe isolation and circuit protection. Designed for seamless integration into 185mm bus bar systems, this unit utilises high-strength M12 screw terminals ensuring secure, low-resistance connections.
£497.75
The Mersen M1023212 is a high-performance NH vertical fuse-switch disconnector engineered for safe switching, isolation and fuse protection within industrial low-voltage power distribution systems. As part of the Mersen MULTIVERT® 400A series, it provides dependable protection for demanding electrical installations while supporting efficient maintenance and reliable system operation.
This model features an integrated calibrated current transformer (CT) rated at 400/5 A, Class 0.5, factory fitted in pole 1 for single-phase current measurement. Designed for direct installation onto 185 mm busbar systems, it combines compact construction with robust switching performance for modern switchboards and distribution panels.
Rated at 400 A and suitable for systems up to 690 V AC, the M1023212 accepts NH size 2 fuse-links manufactured to IEC and EN standards. The unit is supplied with three M12 bolt cable terminals, providing secure conductor connections for industrial and commercial power distribution applications.
The Mersen M1023212 combines the protective performance of an NH fuse-switch disconnector with an integrated calibrated current transformer, allowing accurate current monitoring without requiring additional external measuring equipment. This makes it particularly suitable for installations where both protection and energy measurement are required.
Its MULTIVERT design enables quick installation onto standard 185 mm busbar systems while maintaining high levels of operator safety during installation and maintenance. The modular construction also simplifies future expansion and servicing of industrial switchboards.
| Current | 400 A |
|---|---|
| Phase | Three Phase |
| Item number | M1023212 |
| Catalogue No | 1.250.064 |
| Description | NH fuse-switch disconnector MULTIVERT® Size 2 400A 1x3-Pole switching Bus bar system 185mm Screw M12 ct1P c. |
| EAN/UPC Code | 9008567008287 |
| Frequency (Hz) | 50 ... 60 Hz |
| Rated voltage AC IEC | 690 V |
| Ampere Rating | 400 A |
| Utilization Category | AC 23 B @ Ue = AC 400 V; Ie = 400 A AC 22 B @ Ue = AC 500 V; Ie = 400 A AC 21 B @ Ue = AC 690 V; Ie = 400 A |
| Switchability | 1x3-pole switching |
| RoHS Compliant | Yes |
| AC or DC | AC |
| Short Circuit Current Rating (SCCR) | 120kA@Ue = AC 400 V; Ie = 400 A / 120kA@Ue = AC 500 V; Ie = 400 A / 120kA@Ue = AC 690 V; Ie = 315 A / 100kA@Ue = AC 690 V; Ie = 400 A |
| Fuse Size | 2 |
| Design Details | MULTIVERT® 1.250.000 with integrated C.T. 400/5A, 3,75 VA, class 0,5; calibrated, for single pole measurement (ready fitted in pole 1) |
| Number of Poles | 3-Pole |
| Degree of Pollution | 3 |
| Rated Impulse Withstand Voltage | 12 kV |
| Rated Insulation Voltage | 1000 V |
| Rated SC Withstand | 8 kA / 1 s |
| Max Power dissipation of Fuse Links Pn | 34 W |
| Max Power dissipation of Solid Links Pn | 9 W |
| Power Dissipation by Ith without Fuse-Links | 61 W |
| Power Dissipation by Ith without Solid Links | 151 W |
| Rated short circuit making capacity with solid links Icm | 16 kA |
| Installation Mounting | Bus bar system 185 mm |
| Product Width | 98 mm |
| Product Length | 190 mm |
| Product Height | 685 mm |
| Sell Pack Quantity | 1 EA |
| Sell Pack Weight | 4.9 kg |
| Sell Pack Width | 100 mm |
| Sell Pack Length | 688 mm |
| Sell Pack Height | 195 mm |
| Product group | IEC Fuse Switch Disconnectors |
| Conventional Free Air thermal Current With Fuse-Links Ith | 400 A |
| Product Weight | 4.9 kg |
| Conventional Free Air thermal Current - Solid Links | 630 A |
The M1023212 provides switching, isolation and fused protection for three-phase low-voltage electrical distribution systems while also offering integrated current measurement.
The unit includes a factory-fitted 400/5 A, 3.75 VA, Class 0.5 calibrated current transformer installed in pole 1 for single-pole measurement.
The fuse-switch disconnector accepts standard NH size 2 fuse-links manufactured in accordance with IEC/EN 60269-2.
The M1023212 has a continuous rated current of 400 A.
This MULTIVERT model is designed for direct installation onto standard 185 mm busbar systems.
Mersen MULTIVERT fuse-switch disconnectors are trusted worldwide by panel builders, electrical contractors and industrial engineers for delivering safe circuit isolation, dependable fuse protection and reliable long-term operation in demanding power distribution systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...