MERSEN FUSE MB1 250A 1P 1.000.388 1.000.388

Robust 1-pole switch disconnector engineered for reliable and safe circuit isolation in demanding industrial applications. Supports up to 250A with bottom-fitting panel mount and secure screw M10 connections.

SKU: Q229876Alt SKU: 1.000.388MPN: Q229876

List Price £128.92 ex VAT

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

This robust 1-pole switch disconnector is engineered for reliable and safe circuit isolation in demanding industrial applications. Supporting up to 250A, it features a bottom-fitting, panel-mount design and secure screw M10 connections for efficient installation and maintenance.

Designed with NH technology, the MULTIBLOC® Size 1 unit ensures precise fuse switching and enhanced operational safety. Its high-quality build guarantees long-term performance, making it an optimum choice for professionals seeking dependable protection and easy integration within control panels.

Product Code: Q229876

Key Benefits

Reliable and safe circuit isolation for industrial environments
Supports up to 250A with precise 1-pole switching
Bottom fitting panel mount for easy installation
Secure screw M10 connections for durable and stable wiring
High-quality NH fuse technology for enhanced operational safety
Compact design with dimensions suitable for control panel integration

Compatibility

This NH fuse-switch disconnector is compatible with Size 1 NH fuses and designed to integrate seamlessly into IEC fuse switch disconnector systems. It is suitable for use with AC electrical systems up to 690 V and can be installed in panels requiring bottom fitting mounting configurations.

Applications

Industrial control panels requiring reliable circuit isolation
Electrical distribution systems in commercial and industrial buildings
Protection of motors, transformers, and other electrical equipment
Use in manufacturing plants and heavy machinery installations
Switching and protection in power distribution networks

Technical Specifications

Current	250 A
Phase	Single Phase
Item number	Q229876
Catalogue No	1.000.388
Description	NH fuse-switch disconnector MULTIBLOC® Size 1 250A 1-pole switching Bottom Fitting/panel Connection Screw M10
EAN/UPC Code	4027597026776
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
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	Bottom Fitting/panel
Product Width	71 mm
Product Length	110.5 mm
Product Height	246 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	1 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	1 kg
Conventional Free Air thermal Current - Solid Links	400 A
HS Code	85365080
Country of Manufacture	Hungary
Poles	1-pole
Device Type	Fuse switch disconnector
Voltage	690 V

Frequently Asked Questions

What is the maximum current rating of this fuse-switch disconnector?

The NH Fuse-Switch Disconnector MULTIBLOC® Size 1 supports a maximum ampere rating of 250 A.

Can this product be used in DC applications?

This particular model is specified for AC use only.

What type of mounting does this product use?

It uses a bottom fitting panel mounting design for easy installation.

What is the rated voltage for this device?

The rated voltage AC IEC for this product is 690 V.

What type of connections does it support?

It features secure screw M10 connections for reliable wiring.

Common Search Terms

NH fuse switch disconnector, MULTIBLOC® Size 1, 250A fuse switch, industrial fuse switch, bottom fitting fuse switch, panel mount fuse switch, IEC fuse switch disconnector, screw M10 connection fuse switch

Current	250 A
Phase	Single Phase
Item number	Q229876
Catalogue No	1.000.388
Description	NH fuse-switch disconnector MULTIBLOC® Size 1 250A 1-pole switching Bottom Fitting/panel Connection Screw M10
EAN/UPC Code	4027597026776
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
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	Bottom Fitting/panel
Product Width	71 mm
Product Length	110.5 mm
Product Height	246 mm
Sell Pack Quantity	1 EA
Sell Pack Weight	1 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	1 kg
Conventional Free Air thermal Current - Solid Links	400 A
HS Code	85365080
Country of Manufacture	Hungary
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.

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£8 ex VAT · free over £200

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

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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.

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