RS PRO 40A British Standard Fuse, A3, 550V ac, 73.5mm

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Subtotal (1 pack of 5 units)*

£45.54

(exc. VAT)

£54.65

(inc. VAT)

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  • 135 unit(s) ready to ship
  • Plus 100 unit(s) shipping from 30 October 2025
  • Plus 135 unit(s) shipping from 23 January 2026
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Units
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Per Pack*
5 - 20£9.108£45.54
25 - 120£8.006£40.03
125 - 245£6.694£33.47
250 - 495£6.03£30.15
500 +£5.774£28.87

*price indicative

RS Stock No.:
521-2630
Brand:
RS PRO
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Brand

RS PRO

Current Rating

40A

Fuse Size

A3

Voltage Rating

550V ac

Fuse Standard

BS 88, IEC 269

Fixing Centres

73.5mm

Application Category

gG

Tag Width

12.7mm

High Rupture Capacity

Yes

Overall Length

87mm

Tag Type

Bolted

Body Diameter

21mm

Tag Orientation

Offset

Body Length

54mm

Body Height

22.3mm

Offset Distance

73mm

Series

BAO

Fuse Dimensions

21 x 54mm

RoHS Status: Exempt

COO (Country of Origin):
IN

RS PRO British Standard Fuse, 40A Current Rating, 550V AC Voltage


This British Standard Fuse is designed for reliable electrical protection in various applications. With a current rating of 40A and a voltage rating of 550V AC, it adheres to BS 88 and IEC 269 standards. Compactly sized at 21mm in diameter and 54mm in length, this high rupture capacity fuse provides essential safeguards for electrical circuits.

Features & Benefits


• Offers a current rating of 40A for robust performance
• High rupture capacity ensures safety during overloads
• Meets BS 88 and IEC 269 standards for reliability
• Bolted tag design provides secure connections
• A3 fuse size allows compatibility with various enclosures
• gG fuse rating suitable for general applications

Applications


• Used in industrial electrical installations for circuit protection
• Applicable in automation systems where overload safety is crucial
• Ideal for installations using 550V AC supply for reliable performance
• Utilised in machinery and equipment requiring a 40A fuse rating

What specific advantages does the bolted tag design provide in electrical installations?


The bolted tag design ensures a secure and stable connection, reducing the risk of disconnection during high-load situations and providing reliable circuit protection in demanding environments.

How does this fuse perform in terms of pre-arcing time at 415V?


The pre-arcing time is rated at 1400ms at 415V, which allows for improved safety by enabling prompt response to overload conditions, thus minimising potential damage.

What is the significance of the gG rating for this fuse, and where is it typically applicable?


The gG rating indicates that it is suitable for applications requiring high inrush current tolerance, making it ideal for protecting motors, transformers, and similar equipment where initial current surges may occur.

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