MERSEN FUSE MB1 250A 1P 1.001.818 1.001.818

1-pole NH fuse-switch disconnector ensuring reliable circuit protection and safe disconnection up to 250A with robust bottom fitting and screw bus bar installation M10.

SKU: S1023056Alt SKU: 1.001.818MPN: S1023056

List Price £274.30 ex VAT

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£274.30

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

Engineered for demanding industrial environments, this 1-pole NH fuse-switch disconnector ensures reliable circuit protection and safe disconnection up to 250A. Its robust bottom fitting and panel connection support seamless integration, with secure screw bus bar installation using M10 terminals.

Designed for efficient installation and maintenance, the MULTIBLOC® unit delivers outstanding electrical performance and longevity. Suited for modern switchgear assemblies, it offers dependable operation and compliance with stringent safety standards.

Product Code: S1023056

Key Benefits

Reliable circuit protection with 250A rating for industrial applications
Robust bottom fitting and panel connection for secure installation
Easy screw bus bar installation using M10 terminals
High short circuit current rating up to 80kA for enhanced safety
Compact design with efficient power dissipation for longevity
Complies with IEC standards ensuring quality and safety

Compatibility

This NH fuse-switch disconnector is compatible with IEC fuse switch disconnectors systems and modern switchgear assemblies requiring 1-pole switching up to 250A. It supports bus bar installation and is suitable for use in AC systems with rated voltages up to 690 V.

Applications

Industrial electrical distribution panels
Switchgear assemblies in manufacturing plants
Power distribution in commercial buildings
Protection and isolation in motor control centres
Maintenance and service isolation in electrical installations

Technical Specifications

Current	250 A
Phase	Single Phase
Item number	S1023056
Catalogue No	1.001.818
Description	NH fuse-switch disconnector MULTIBLOC® Size 1 250A 1-pole switching Bottom Fitting/panel Connection Screw Bus Bar Installation M10
EAN/UPC Code	9008567002179
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 22 B @ Ue = DC 220 V; Ie = 250 A
Switchability	1-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
Design Details	Screw
Number of Poles	1-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	4 W
Power Dissipation by Ith without Solid Links	10 W
Rated short circuit making capacity with solid links Icm	8.2 kA
Installation Mounting	Bus Bar Installation
Product Width	71 mm
Product Length	110.5 mm
Product Height	246 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	0.91 kg
Sell Pack Width	79 mm
Sell Pack Length	246 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	0.91 kg
Conventional Free Air thermal Current - Solid Links	400 A
Poles	1-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 250A for this 1-pole NH fuse-switch disconnector.

Can this product be used in DC applications?

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

What type of mounting does this product support?

It supports bus bar installation with screw bus bar terminals using M10 screws.

What is the short circuit current rating?

The short circuit current rating is up to 80kA at AC 400 V and 500 V for 1- and 2-pole configurations.

Is this product compliant with international standards?

Yes, it complies with IEC standards for fuse switch disconnectors.

Common Search Terms

NH fuse switch disconnector, MULTIBLOC fuse switch, 250A fuse switch, 1-pole fuse switch, industrial fuse switch, IEC fuse switch disconnector, bus bar fuse switch, screw terminal fuse switch, electrical circuit protection

Current	250 A
Phase	Single Phase
Item number	S1023056
Catalogue No	1.001.818
Description	NH fuse-switch disconnector MULTIBLOC® Size 1 250A 1-pole switching Bottom Fitting/panel Connection Screw Bus Bar Installation M10
EAN/UPC Code	9008567002179
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 22 B @ Ue = DC 220 V; Ie = 250 A
Switchability	1-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
Design Details	Screw
Number of Poles	1-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	4 W
Power Dissipation by Ith without Solid Links	10 W
Rated short circuit making capacity with solid links Icm	8.2 kA
Installation Mounting	Bus Bar Installation
Product Width	71 mm
Product Length	110.5 mm
Product Height	246 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	0.91 kg
Sell Pack Width	79 mm
Sell Pack Length	246 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	0.91 kg
Conventional Free Air thermal Current - Solid Links	400 A
Poles	1-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

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£8 ex VAT · free over £200

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

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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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Delivery is calculated at checkout based on your destination.

Orders with mixed availability

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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.

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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

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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

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