RS PRO 4A British Standard Fuse, A1, 550V ac, 44.5mm
- RS Stock No.:
- 521-2472
- Brand:
- RS PRO
Bulk discount available
Subtotal (1 pack of 5 units)*
£17.58
(exc. VAT)
£21.095
(inc. VAT)
FREE delivery for orders over £50.00
In Stock
- 35 unit(s) ready to ship
- Plus 285 unit(s) shipping from 07 November 2025
- Plus 575 unit(s) shipping from 30 January 2026
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units | Per unit | Per Pack* |
---|---|---|
5 - 20 | £3.516 | £17.58 |
25 - 120 | £3.116 | £15.58 |
125 - 245 | £2.81 | £14.05 |
250 - 495 | £2.508 | £12.54 |
500 + | £2.148 | £10.74 |
*price indicative
- RS Stock No.:
- 521-2472
- Brand:
- RS PRO
Specifications
Technical Reference
Legislation and Compliance
Product Details
Find similar products by selecting one or more attributes.
Select all | Attribute | Value |
---|---|---|
Brand | RS PRO | |
Current Rating | 4A | |
Fuse Size | A1 | |
Voltage Rating | 550V ac | |
Fuse Standard | BS 88, IEC 60269 | |
Fixing Centres | 44.5mm | |
Application Category | gG | |
Tag Width | 11.2mm | |
High Rupture Capacity | Yes | |
Overall Length | 55mm | |
Tag Type | Slotted | |
Body Diameter | 13.8mm | |
Body Length | 34.6mm | |
Tag Orientation | Offset | |
Body Height | 34.6mm | |
Series | NITD | |
Fuse Dimensions | 13.7 x 55.2mm | |
Select all | ||
---|---|---|
Brand RS PRO | ||
Current Rating 4A | ||
Fuse Size A1 | ||
Voltage Rating 550V ac | ||
Fuse Standard BS 88, IEC 60269 | ||
Fixing Centres 44.5mm | ||
Application Category gG | ||
Tag Width 11.2mm | ||
High Rupture Capacity Yes | ||
Overall Length 55mm | ||
Tag Type Slotted | ||
Body Diameter 13.8mm | ||
Body Length 34.6mm | ||
Tag Orientation Offset | ||
Body Height 34.6mm | ||
Series NITD | ||
Fuse Dimensions 13.7 x 55.2mm | ||
RoHS Status: Exempt
- COO (Country of Origin):
- IN

Eaton NITD Series British Standard Fuse, 4A Current Rating, 550V AC Voltage Rating - NITD4RS
This British Standard Fuse is designed to provide robust protection for electrical circuits. The fuse features a current rating of 4A and a voltage rating of 550V AC, ensuring reliable performance in various applications. Its slotted tag design allows for easy installation, while its high rupture capacity accommodates quick fault response. The fuse dimensions include a body diameter of 13.7mm and an overall length of 55.2mm, making it suitable for standard fittings.
Features & Benefits
• High rupture capacity ensures safe, efficient operation
• gG application category supports diverse industrial uses
• Effective protection against overload and short-circuit faults
• Compact dimensions fit various electrical assemblies
• gG application category supports diverse industrial uses
• Effective protection against overload and short-circuit faults
• Compact dimensions fit various electrical assemblies
Applications
• Used for electrical protection in automation systems
• Ideal for in the mechanical industry
• Compatible with various electronic circuit designs
• Used in installations requiring reliable circuit safeguarding
• Ideal for in the mechanical industry
• Compatible with various electronic circuit designs
• Used in installations requiring reliable circuit safeguarding
What are the advantages of the high rupture capacity in this fuse?
The high rupture capacity enables the fuse to handle fault conditions safely, minimising the risk of damage to electrical components by efficiently interrupting excessive currents.
How does the slotted tag design improve usability in installations?
This design allows for quicker and easier mounting in fuse holders, enhancing installation efficiency and ensuring a secure connection in various applications.
What industry standards does this fuse adhere to and why is that important?
Adherence to BS 88 and IEC 60269 standards guarantees that this fuse meets essential safety and performance criteria, making it suitable for professional use in electrical circuits.
Related links
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- RS PRO 6A British Standard Fuse 550V ac, 44.5mm
- RS PRO 16A British Standard Fuse 550V ac, 44.5mm
- RS PRO 10A British Standard Fuse 550V ac, 44.5mm
- RS PRO 20A British Standard Fuse 550V ac, 44.5mm
- Eaton 25A British Standard Fuse 550V ac, 44.5mm