AMI / MIDI Fuse - 40 Amp - AMI / MIDI Fuse - 40 Amp

AMI / MIDI Fuse - 40 Amp - Dimensioned Drawing

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Blue Sea Systems

5251-BSS

AMI / MIDI Fuse - 40 A

The Blue Sea Systems 40-amp AMI/MIDI fuse provides reliable electrical protection for critical marine circuits. Designed for fast interruption in case of overload, it is an essential spare for AMI/MIDI fuse holders. This product includes the 40-amp AMI/MIDI fuse only.

Retail priceBenefit from the professional rate

$7.98 USD

$7.98 USD ~~$9.75 USD~~

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In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

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Support service

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Technical specifications

Fuse type	AMI/MIDI
Nominal voltage	32 V
Amperage	40.0
Pouvoir de coupure en court-circuit	2.0
Nombre de fusibles	1.0
Mounting type	In a fuse holder
Taille du filetage des bornes	M5
Fuse included	Oui
Flame retardant	Oui
Conformité ABYC	Oui
Contact material	Tinned copper
Housing material	Ceramic
Couple de serrage recommandé des bornes	3.05
Dimensions (W x H x D)	41.07 x 8.36 x 12.19 mm
Weight	0.015
Operating temperature range	-40°F to 257°F
Certifications	CE, ABYC
Code-barres du produit	SK-000048483
Manufacturer part number	5251B-BSS
Nom du modèle	AMI / MIDI Fuse
Catégorie de produit niveau 0	Merchandise
Product category level 1	NAVICO GROUP
Product category level 2	13 - Blue Sea BSS (35)
Product category level 3	Fuses
Product Category Level 4	AMI/MIDI fuses
Description courte du produit	40-ampere AMI/MIDI fuse for rapid protection of marine electrical circuits against overloads and short circuits.
Product type	Fuse

Detailed description

The Blue Sea Systems 40-amp AMI / MIDI fuse is an essential protection component for marine electrical installations. Designed to interrupt a circuit quickly in case of overload or short circuit, it prevents damage to onboard equipment and cables. This type of fuse, known as AMI or MIDI, is commonly used to protect main circuits or high-current equipment such as small inverters, windlasses, or certain pumps.

Protection and Compatibility

The 40-amp AMI / MIDI fuse fits into specific fuse holders for this standard, ensuring a secure connection and installation compliant with marine standards. Its design allows direct comparison with other fuses of the same type, as shown in Blue Sea Systems technical documents. It is a protection solution for circuits requiring moderate amperage, complementing broader protection systems that include circuit breakers or ANL fuses for higher currents, or ATO/ATC fuses for low-intensity circuits.

Role in Marine Electrical Installation

Selecting a 40-amp fuse is determined by the maximum consumption of the devices it protects and the cable cross-section used, in accordance with electrical safety standards. This Blue Sea Systems fuse guarantees reliable current interruption in case of failure, minimizing fire risks or system damage. It is a critical element in a vessel’s electrical protection strategy, ensuring equipment longevity and occupant safety.

Documentation

Type	Nom
	EN - Full Scale Fuse Comparison (scaled 1 - 1) - AMI - MIDI Fuse - 40 Amp

Expert opinion

Pol CONIN

Digital Manager

« Technical analysis of the 40A AMI/MIDI fuse for marine protection »

The Blue Sea Systems 40-amp AMI/MIDI fuse is a critical component for protecting intermediate-power electrical circuits aboard vessels. Its 40A rating is designed for specific applications, such as safeguarding power lines for auxiliary equipment like small bow thrusters, secondary battery charging circuits, or limited-capacity inverters/converters. It is essential to use this fuse with a compatible AMI/MIDI fuse holder to ensure compliance and installation safety.

The advantage of this fuse type lies in its rapid response to overloads, effectively protecting cables and sensitive equipment. Unlike ANL fuses, which handle much higher currents and are often used for main battery circuits, the 40A AMI/MIDI fuse provides targeted protection for specific loads. It is also more robust than ATO/ATC fuses, which are typically reserved for very low-current circuits. When installing or replacing, it is critical to verify that the amperage matches the circuit requirements to avoid under-protection or unnecessary over-protection. A stock of spare fuses is always recommended aboard.

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AMI / MIDI Fuse - 40 A

$7.98 USD

$7.98 USD ~~$9.75 USD~~

Frequently Asked Questions

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What is an AMI/MIDI fuse and what is it used for?

An AMI/MIDI fuse is a bolt-down type of fuse designed to protect electrical circuits from overloads and short circuits. It quickly interrupts the current in case of a problem, preventing damage to equipment and cables. This fuse is specifically a 40-amp model from Blue Sea Systems, commonly used in marine electrical installations for moderate-current applications.

What is the rated current of this Blue Sea Systems fuse?

This Blue Sea Systems fuse is a 40 amp (40A) model. It is designed to protect circuits that do not exceed this current under normal operation.

For which types of marine equipment is this 40 amp fuse suitable?

This 40 amp fuse is suitable for protecting main circuits or equipment with moderate current consumption in marine installations. This may include small inverters, windlasses, certain pumps, or other devices requiring protection around this current rating.

What type of fuse holder is required to install this AMI/MIDI fuse?

This 40-amp AMI/MIDI fuse requires a specific fuse holder designed for AMI or MIDI fuses. These fuse holders feature bolted terminals to ensure a secure connection compliant with marine standards.

How to properly install a 40 amp AMI/MIDI fuse?

To install this fuse correctly, first ensure the circuit is de-energized. Then insert the fuse into a compatible AMI/MIDI fuse holder. Secure the fuse to the holder using the bolts (usually supplied with the holder), ensuring a tight fit for proper electrical contact. It is critical to verify that the fuse holder is correctly connected to the circuit being protected and to comply with current safety standards.

Why is it important to choose a fuse with the correct amperage?

It is crucial to choose a fuse with the correct amperage to ensure effective protection of your electrical installation. An undersized fuse will trip unnecessarily, while an oversized fuse will not adequately protect the cables and equipment in case of overload or short circuit, which could lead to serious damage or a fire risk. The fuse amperage must be selected based on the maximum consumption of the protected device and the cross-section of the cable used, in accordance with electrical safety standards.

What is the difference between an AMI fuse and a MIDI fuse?

The terms AMI and MIDI are often used interchangeably to refer to a compact, high-current bolt-on fuse type, commonly used in marine and automotive applications. While there may be slight variations between manufacturers, AMI and MIDI fuses generally share the same physical format and bolt-on mounting method, making them compatible with the same fuse holders.

Is this fuse compatible with 12V or 24V marine DC electrical systems?

Yes, this 40-amp AMI/MIDI fuse is designed to be compatible with 12V or 24V marine DC electrical systems. Fuses of this type are commonly used for circuit protection in these environments.