MERSEN FUSE MB1 250A 3P 1.000.299 1.000.299

The MULTIBLOC® Size 1 250A 3-Pole NH fuse-switch disconnector is engineered for reliable power distribution and circuit protection in industrial switchgear applications. It features bottom fitting and M10 screw panel connections for secure installation.

SKU: S229878Alt SKU: 1.000.299MPN: S229878

List Price £185.99 ex VAT

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£185.99

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Manufacturer Lead Time

£185.99

Why Choose the NH Fuse-Switch Disconnector MULTIBLOC® Size 1 250A 3-Pole?

The MULTIBLOC® Size 1 250A 3-Pole NH fuse-switch disconnector is engineered for reliable power distribution and circuit protection in industrial switchgear applications. Its robust construction ensures safe and precise isolation, with bottom fitting and M10 screw panel connections for secure and straightforward installation.

Designed for demanding environments, this device supports high current ratings up to 250A, offering dependable performance and fast fuse replacement. Trust the MULTIBLOC® for enhanced safety, minimal downtime, and straightforward integration into your control panels.

Product Code: S229878

Key Benefits

Reliable power distribution and circuit protection up to 250A
Robust construction for safe and precise isolation
Bottom fitting and M10 screw panel connection for secure installation
Supports fast fuse replacement to minimise downtime
High short circuit current rating for enhanced safety
Compatible with IEC standards for industrial switchgear

Compatibility

This NH fuse-switch disconnector is compatible with MULTIBLOC® Size 1 fuse links and designed for integration into industrial control panels and switchgear systems requiring 3-pole switching and 250A current ratings. It suits applications adhering to IEC standards and supports both AC 50/60 Hz systems up to 690 V.

Applications

Industrial power distribution panels
Switchgear assemblies requiring fuse-switch disconnectors
Electrical isolation in manufacturing plants
Protection of motors, transformers, and cables
Control panels in commercial and industrial facilities

Technical Specifications

Current	250 A
Phase	Three Phase
Item number	S229878
Catalogue No	1.000.299
Description	NH fuse-switch disconnector MULTIBLOC® Size 1 250A 3-Pole switching Bottom Fitting/panel Connection Screw M10
EAN/UPC Code	4027597026691
Frequency (Hz)	50 ... 60 Hz
Rated voltage AC IEC	690 V
Ampere Rating	250 A
Utilization Category	AC 23 B @ Ue = AC 400 V; Ie = 250 A AC 22 B @ Ue = AC 500 V; Ie = 250 A AC 21 B @ Ue = AC 690 V; Ie = 200 A DC 21 B @ Ue = DC 440 V; Ie = 250 A
Switchability	3-pole switching
AC or DC	AC
Short Circuit Current Rating (SCCR)	80kA@Ue=AC 400 V;Ie=250 A / 80kA@Ue=AC 500 V;Ie=250 A / 80kA (1-,2-pole)@Ue=AC 690 V;Ie=200 A / 50kA (3-,4-pole)@Ue=AC 690 V;Ie=200 A
Fuse Size	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	23 W
Max Power dissipation of Solid Links Pn	2.6 W
Power Dissipation by Ith without Fuse-Links	13 W
Power Dissipation by Ith without Solid Links	33 W
Rated short circuit making capacity with solid links Icm	8.2 kA
Installation Mounting	Bottom Fitting/panel
Product Width	185 mm
Product Length	110.5 mm
Product Height	246 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	2.42 kg
Sell Pack Width	187 mm
Sell Pack Length	248 mm
Sell Pack Height	112 mm
Product group	IEC Fuse Switch Disconnectors
Conventional Free Air thermal Current With Fuse-Links Ith	250 A
Product Weight	2.42 kg
Conventional Free Air thermal Current - Solid Links	400 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 maximum current rating of this fuse-switch disconnector?

The maximum ampere rating is 250 A, suitable for industrial applications requiring this current level.

Can this device be used for DC applications?

This particular model is designed for AC applications only, as indicated by the AC or DC specification.

What type of mounting does this product support?

The product supports bottom fitting and panel mounting with M10 screw connections for secure installation.

Is this fuse-switch disconnector suitable for high short circuit currents?

Yes, it has a short circuit current rating (SCCR) of up to 80kA at AC 400 V and 500 V, providing robust protection.

How many poles does this switch disconnector have?

This product features 3-pole switching for comprehensive circuit isolation.

Common Search Terms

NH fuse-switch disconnector, MULTIBLOC Size 1, 250A fuse switch, 3-pole disconnector, industrial fuse switch, IEC fuse switch disconnector, bottom fitting fuse switch, M10 screw connection, high current fuse switch, circuit protection device

Current	250 A
Phase	Three Phase
Item number	S229878
Catalogue No	1.000.299
Description	NH fuse-switch disconnector MULTIBLOC® Size 1 250A 3-Pole switching Bottom Fitting/panel Connection Screw M10
EAN/UPC Code	4027597026691
Frequency (Hz)	50 ... 60 Hz
Rated voltage AC IEC	690 V
Ampere Rating	250 A
Utilization Category	AC 23 B @ Ue = AC 400 V; Ie = 250 A AC 22 B @ Ue = AC 500 V; Ie = 250 A AC 21 B @ Ue = AC 690 V; Ie = 200 A DC 21 B @ Ue = DC 440 V; Ie = 250 A
Switchability	3-pole switching
AC or DC	AC
Short Circuit Current Rating (SCCR)	80kA@Ue=AC 400 V;Ie=250 A / 80kA@Ue=AC 500 V;Ie=250 A / 80kA (1-,2-pole)@Ue=AC 690 V;Ie=200 A / 50kA (3-,4-pole)@Ue=AC 690 V;Ie=200 A
Fuse Size	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	23 W
Max Power dissipation of Solid Links Pn	2.6 W
Power Dissipation by Ith without Fuse-Links	13 W
Power Dissipation by Ith without Solid Links	33 W
Rated short circuit making capacity with solid links Icm	8.2 kA
Installation Mounting	Bottom Fitting/panel
Product Width	185 mm
Product Length	110.5 mm
Product Height	246 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	2.42 kg
Sell Pack Width	187 mm
Sell Pack Length	248 mm
Sell Pack Height	112 mm
Product group	IEC Fuse Switch Disconnectors
Conventional Free Air thermal Current With Fuse-Links Ith	250 A
Product Weight	2.42 kg
Conventional Free Air thermal Current - Solid Links	400 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.

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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

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

Delivery is calculated at checkout based on your destination.

Orders with mixed availability

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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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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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