MPN

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

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

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

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Subtotal (1 pack of 5 units)*

£47.28

(exc. VAT)

£56.735

(inc. VAT)

FREE delivery for orders over £60.00

In Stock

Plus 210 unit(s) shipping from 15 June 2026

Need more? Click ‘Check delivery dates’ to find extra stock and lead times.

Units	Per unit	Per Pack*
5 - 20	£9.456	£47.28
25 - 120	£8.312	£41.56
125 - 245	£6.95	£34.75
250 - 495	£6.26	£31.30
500 +	£5.994	£29.97

*price indicative

RS Stock No.:: 521-2630
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
	Product Type	British Standard Fuse
	Current Rating	40A
	Fuse Size	A3
	Voltage	550V ac
	Standards/Approvals	IEC 269, BS 88
	Fixing Centres	73.5 mm
	Application Category	gG
	Tag Width	12.7mm
	Fuse Speed	F
	High Rupture Capacity	Yes
	Tag Orientation	Offset
	Length	54mm
	Overall Length	87mm
	Height	22.3mm
	Width	21mm
	Diameter	21mm
	Series	BAO

	Select all
	Brand RS PRO
	Product Type British Standard Fuse
	Current Rating 40A
	Fuse Size A3
	Voltage 550V ac
	Standards/Approvals IEC 269, BS 88
	Fixing Centres 73.5 mm
	Application Category gG
	Tag Width 12.7mm
	Fuse Speed F
	High Rupture Capacity Yes
	Tag Orientation Offset
	Length 54mm
	Overall Length 87mm
	Height 22.3mm
	Width 21mm
	Diameter 21mm
	Series BAO

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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