MERSEN FUSE MB2 400A 3P 1.000.504 1.000.504

Reliable NH fuse-switch disconnector MULTIBLOC® Size 2 with 400A rating and 3-pole switching, designed for bottom fitting and panel mounting with M10 screws.

SKU: W1002129Alt SKU: 1.000.504MPN: W1002129

List Price £285.39 ex VAT

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£285.39

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Manufacturer Lead Time

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Why Choose the NH Fuse-Switch Disconnector MULTIBLOC® Size 2 400A 3-Pole?

Engineered for demanding industrial and commercial installations, the MULTIBLOC® Size 2 400A 3-pole fuse-switch disconnector delivers reliable circuit protection and isolation. Its robust bottom fitting and M10 panel connection screws ensure secure, vibration-resistant mounting in challenging environments.

This device simplifies maintenance with straightforward fuse replacement while providing excellent thermal and electrical performance. Optimised for efficient switching under load, it enhances safety and minimises downtime for critical systems.

Product Code: W1002129

Key Benefits

Reliable circuit protection and isolation for industrial and commercial applications.
Robust bottom fitting with M10 panel connection screws ensures secure and vibration-resistant mounting.
Simple and safe fuse replacement for easy maintenance.
Optimised for efficient switching under load to enhance operational safety.
High short circuit current rating for superior fault tolerance.
Complies with RoHS standards for environmental safety.

Compatibility

This fuse-switch disconnector is compatible with NH fuse links size 2 and designed for integration into IEC fuse switch disconnector panels and systems. It supports 3-pole switching and is suitable for use in AC systems up to 690 V.

Applications

Industrial power distribution systems.
Commercial electrical installations requiring reliable circuit isolation.
Switchgear and control panels.
Maintenance and safety isolation in manufacturing plants.
Protection of motors, transformers, and other electrical equipment.

Technical Specifications

Current	400 A
Phase	Three Phase
Item number	W1002129
Catalogue No	1.000.504
Description	NH fuse-switch disconnector MULTIBLOC® Size 2 400A 3-Pole switching Bottom Fitting/panel Connection Screw M10
EAN/UPC Code	4027597023393
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 = 315 A DC 21 B @ Ue = DC 440 V; Ie = 400 A
Switchability	3-pole switching
RoHS Compliant	Yes
AC or DC	AC
Short Circuit Current Rating (SCCR)	80kA@Ue = AC 400 V; Ie = 400 A / 80kA@Ue = AC 500 V; Ie = 400 A / 80kA (3-pole)@Ue = AC 690 V; Ie = 315 A / 50kA (4-pole)@Ue = AC 690 V; Ie = 315 A
Fuse Size	2
Number of Poles	3-Pole
Degree of Pollution	3
Rated Impulse Withstand Voltage	12 kV
Rated Insulation Voltage	1000 V
Rated SC Withstand	13 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	27 W
Power Dissipation by Ith without Solid Links	67 W
Rated short circuit making capacity with solid links Icm	10.6 kA
Installation Mounting	Bottom Fitting/panel
Product Width	205 mm
Product Length	130 mm
Product Height	259 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	3.5 kg
Sell Pack Width	208 mm
Sell Pack Length	262 mm
Sell Pack Height	133 mm
Product group	IEC Fuse Switch Disconnectors
Conventional Free Air thermal Current With Fuse-Links Ith	400 A
Product Weight	3.5 kg
Conventional Free Air thermal Current - Solid Links	630 A
HS Code	85365080
Country of Manufacture	Hungary
Poles	3-pole
Device Type	Fuse switch disconnector
Voltage	690 V

Frequently Asked Questions

What is the rated current of this fuse-switch disconnector?

The rated current is 400 A, suitable for demanding industrial and commercial applications.

Can this device be used in DC applications?

This model is designed primarily for AC applications as indicated by its AC rating and specifications.

What type of mounting does this product support?

It supports bottom fitting and panel mounting with M10 connection screws for secure installation.

Is the product RoHS compliant?

Yes, this fuse-switch disconnector complies with RoHS environmental standards.

Common Search Terms

NH fuse switch disconnector, MULTIBLOC size 2, 400A fuse switch, 3-pole fuse switch, industrial fuse switch, IEC fuse switch disconnector, bottom fitting fuse switch, M10 panel connection fuse switch, high current fuse switch, electrical isolation switch

Current	400 A
Phase	Three Phase
Item number	W1002129
Catalogue No	1.000.504
Description	NH fuse-switch disconnector MULTIBLOC® Size 2 400A 3-Pole switching Bottom Fitting/panel Connection Screw M10
EAN/UPC Code	4027597023393
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 = 315 A DC 21 B @ Ue = DC 440 V; Ie = 400 A
Switchability	3-pole switching
RoHS Compliant	Yes
AC or DC	AC
Short Circuit Current Rating (SCCR)	80kA@Ue = AC 400 V; Ie = 400 A / 80kA@Ue = AC 500 V; Ie = 400 A / 80kA (3-pole)@Ue = AC 690 V; Ie = 315 A / 50kA (4-pole)@Ue = AC 690 V; Ie = 315 A
Fuse Size	2
Number of Poles	3-Pole
Degree of Pollution	3
Rated Impulse Withstand Voltage	12 kV
Rated Insulation Voltage	1000 V
Rated SC Withstand	13 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	27 W
Power Dissipation by Ith without Solid Links	67 W
Rated short circuit making capacity with solid links Icm	10.6 kA
Installation Mounting	Bottom Fitting/panel
Product Width	205 mm
Product Length	130 mm
Product Height	259 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	3.5 kg
Sell Pack Width	208 mm
Sell Pack Length	262 mm
Sell Pack Height	133 mm
Product group	IEC Fuse Switch Disconnectors
Conventional Free Air thermal Current With Fuse-Links Ith	400 A
Product Weight	3.5 kg
Conventional Free Air thermal Current - Solid Links	630 A
HS Code	85365080
Country of Manufacture	Hungary
Poles	3-pole
Device Type	Fuse switch disconnector
Voltage	690 V

UK delivery

Delivery options

Free UK delivery on orders over £200 ex VAT. Order in-stock items before 2pm Monday to Friday for next-day delivery.

This product Lead time on request

Please contact us for a delivery time before you order

Standard delivery

£8 ex VAT · free over £200

UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.

Heavier items may be charged at a weight-based or pallet rate, shown at checkout.

Collect from our showroom

Mon–Fri, 8am–5pm

Order and pay online, then collect from our showroom.

Please allow 15–30 minutes after ordering for us to prepare your order.

Northern Ireland, ROI & export

Priced at checkout

We deliver to Northern Ireland, the Republic of Ireland and overseas.

Delivery is calculated at checkout based on your destination.

Orders with mixed availability

Shipped complete

If part of your order is on a lead time, we hold it and send everything together.

Need the in-stock items sooner? Ask us and we can split the delivery.

Business customer returns

Returns & order support

Need to return an item? Find the guidance for your order below, then contact our team before sending anything back.

Stocked items

Request within 30 days

Changed your mind or ordered the wrong item? Request a return within 30 days of receipt. There is no restocking charge.

Items must be unused, in resalable condition and in their original packaging, and returns need our approval first. Return carriage is at your cost, and the original delivery charge is not refunded.

Faulty or damaged items

Tell us as soon as possible

Faulty, damaged on delivery or the wrong product supplied? Contact our team as soon as possible with the details.

We will review the issue and arrange an appropriate resolution under our terms and conditions and your statutory rights.

Made-to-order items

Manufacturer approval needed

Manufactured, configured and special-order products can only be returned with the manufacturer’s approval. Any handling charge is agreed with you when you request the return.

This does not affect claims for faulty goods or items that do not meet the agreed specification.

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Let’s get your return sorted.

Send your order number, product details and reason for return. For faults or delivery damage, include photographs if available. We will confirm the next steps.

Email returns team 01706 242050

The 30-day return request period applies to change-of-mind returns for stocked items. It does not limit your statutory rights for faulty or non-conforming goods.

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