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HOW TO TEST A FUSE

HOW TO TEST A FUSE

Fuses are an essential part of any electrical installation. They effectively protect the load and electrical systems against short circuits, overcurrent and overloads. Learn how to check if a fuse is blown and what to do if this happens.

Fuses are used in all electrical circuits – in building installations, electrical systems in vehicles, and electronics and household appliances. It is difficult to imagine effective protection of circuits and loads without breaking a circuit in the event of excessive current. Learn about the most common fuse types and find out how to test a fuse.

In this article you will learn: Different types of fuses and their applications?

Fuses come in different types, which differ in design, performance and purpose. Among the most commonly used are fuses, thermal fuses, residual current devices, automotive fuses, PTC resettable fuses, SMD fuses, industrial and miniature fuses.

Fuses

A fuse is designed to break a circuit in the event of excessive current. Its essential component is a metal wire or strip (in some cases multiple strips of metal). How to check if a fuse is blown? To do so, it is necessary to check the condition of the fuse wire.

The relationship between the magnitude of the current that causes melting and the time needed for it to melt is given by the fuse’s melting time-current characteristics. Depending on response time, fuses can be divided into time delay and fast acting fuses.

The time-current characteristics, showing the correlation between current and time up to the melting of a fuse-element, are shown as bands. How to test a fuse? For this purpose, it is worth using the time-current characteristics and determining the current needed to blow a fuse.

With currents corresponding to the melting time less than 0.005 s (¼ cycle), the fuse limits the short-circuit current. In addition, they also act as disconnectors, since a permanent and visible break in the circuit is created when the cartridge fuse is removed or the fuse is unscrewed.

Low-voltage fuses are divided into general purpose fuses, high rupturing capacity fuses and special purpose fuses. Bi-type fuses consist of single-pole sockets, a bottom cartridge fuse, a head and a cartridge fuse inside. The rated currents of fast (BiWts) and slow acting (BiWtz) fuses are between 6 and 200 A. There are also medium acting and super-fast fuses on the market, such as SIBA 7000140.0.1.

Bu or Bm fuses provide higher rupturing capacity. The basic elements of their construction are jaws and cartridge fuses. They are used in transformer stations and large switchboards. They are used for the effective protection of machines with heavy and frequent start-ups, as well as for the protection of power lines.

The measuring instruments or loads are protected by fuses that conduct currents with intensity ranging from tens of milliamperes to several amperes.

How to test a fuse

Thermal fuses

Thermal fuses are designed to interrupt the circuit if the temperature rises to a dangerous level. They are primarily used to protect loads from damage caused by excessive system temperature.

When thinking about how to test a thermal fuse, keep in mind that they are often used to protect individual components of electrical systems - such as transistors.

Thermal fuses disconnect the circuit by melting a small meltable link, which releases the spring mechanism and separates the contacts. There are many thermal fuses on the market with a very wide range of disconnection temperatures, ranging from 72 to even 257°C. The disconnection temperature of ESKA 770.104 is 104°C.

770.104

Thermal fuses come in a variety of types. The most commonly used are thermal fuses, in which a fusible link (pellet) melts when a specific current passes through it. Bimetal thermal fuses, in which the bimetal bends in a specific direction if heated, disconnecting the current, are also available.

When the fuse cools down, the bimetal will return to its previous state, reconnecting the circuit. Bimetal thermal fuses are used, among others, in electric kettles.

How to test a fuse

How to check if a fuse is blown?

When a fuse blows, it disconnects the circuit. How to test a fuse?

To check if the fuse is blown, use a multimeter. Set the multimeter on continuity mode. It may vary depending on the meter used but look for a rectifier diode symbol. To test the fuse use a multimeter AXIOMET AX-MS8221B.

AX-MS8221B

Plug the measuring leads in the multimeter - the red one into the VΩmA socket, and the black one into the negative (COM socket). How to test a fuse? Place the two test probes on the circuit to be tested.

Regardless of the fuse type, the measurement procedure is the same. So…how to test a fuse? In the case of automotive fuses, there are two blades on the top. Small fuses are measured by applying test probes to its both metal ends. Fuses have special recesses in the front part of the housing, which enable the measurement of circuit continuity.

If the circuit is continuous, the reading obtained should be a low resistance value. When the fuse is blown, the meter will indicate infinite resistance, nothing, or a lead failure with an acoustic and/or light signal. The blown cartridge fuse must be replaced with a new one with the same parameters and time-current characteristics. If other elements were also damaged, the entire fuse must be replaced.

How to test a fuse

How to test a thermal fuse?

How to check if a fuse is blown? The current flow through the thermal fuse should also be verified with a multimeter set on continuity mode. Similarly to fuses, the test probes should also be applied to the two conductive contacts of the fuse, checking whether the measurement value is low. If the meter beeps and/or lights or displays high resistance, the thermal fuse has blown and is not conducting electricity.

Symbol: Description:
7000140.0.1 Fuse; super-fast; ceramic; 100mA; 250V
770.104 Thermal fuse; 10A; 250V; 12mm; 104°C
AX-MS8221B Digital multimeter; LCD 3.5 digits (1999) 15mm; 2.5x/s


ARDUINO PRO – AN UNCONVENTIONAL, EASY WAY TO BUILD SUCCESSFUL IOT APPLICATIONS
ARDUINO PRO – AN UNCONVENTIONAL, EASY WAY TO BUILD SUCCESSFUL IOT APPLICATIONS
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RELIABLE AND UNIVERSAL EC MOTORS FROM OLMO MOTORS
We would like our customers to know that TME - in addition to a huge selection of typical electronic components - has a good range of mechanical, electrical and electromechanical components. The latter include motors for fans from the excellent Italian manufacturer OLMO MOTORS.
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RELIABLE AND UNIVERSAL EC MOTORS FROM OLMO MOTORS
LED DRIVERS WITH BLUETOOTH INTERFACE
LED DRIVERS WITH BLUETOOTH INTERFACE
Highly advanced miniaturisation of wireless communication modules combined with a drop in their price is the reason why radio transmission modules can be found almost everywhere. Despite this, incorporating such a module into the LED power supply is a very innovative solution and makes it incredibly easy to create lighting systems.
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HOW TO TEST A FUSE
Fuses are an essential part of any electrical installation. They effectively protect the load and electrical systems against short circuits, overcurrent and overloads. Learn how to check if a fuse is blown and what to do if this happens.
.....
HOW TO TEST A FUSE
R52 SERIES CAPACITORS BY KEMET
R52 SERIES CAPACITORS BY KEMET
When designing any device, regardless of its later application, it is worth equipping it with good quality capacitors. The life span of a device depends to a large extent on these components. One of the companies whose products are of the highest quality is Kemet. In the offer of this manufacturer, special attention should be paid to R52 series suppression capacitors.
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SOLARLOK 2.0 CONNECTORS FOR PHOTOVOLTAIC INSTALLATIONS
Solarlok 2.0 connectors by TE Connectivity are toolless (field-installable) solutions for fitters of photovoltaic installations. The connection to the cable is made by inserting a non-insulated cable end and crimping the housing with pliers. The manufacturer estimates that the use of Solarlok 2.0 solutions allows to save up to 80% of the time spent on the assembly of connectors in photovoltaic installations.
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SOLARLOK 2.0 CONNECTORS FOR PHOTOVOLTAIC INSTALLATIONS
TOOLLESS RJ45 CONNECTORS BY HARTING
TOOLLESS RJ45 CONNECTORS BY HARTING
Harting is a world leader in the production of industrial connectors. Its products are characterized by an innovative, durable design and precise workmanship. We are constantly expanding our range of products by Harting available in TME’s catalogue – most of the manufacturer's components are available directly from our warehouses, which guarantees quick shipment.
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SUPERSEAL WATERPROOF CONNECTORS – HOW TO CRIMP AND CONNECT THEM PROPERLY
Superseal connectors from TE Connectivity are well-known thanks to their durability. They are widely used in the automotive and heavy industries, agriculture and wherever wires may be exposed to adverse conditions.
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SUPERSEAL WATERPROOF CONNECTORS – HOW TO CRIMP AND CONNECT THEM PROPERLY
Smart Glow ATO car fuses
Smart Glow ATO car fuses
Transfer Multisort Elektronik offers a wide range of LITTELFUSE products, which can be applied in various branches of industry. Smart Glow ATO car fuses, which we recommend today, are used in the automotive industry on a daily basis.
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Prolight Opto UV-C diodes for professional use
PB2D-1CLA-TC LEDs by Prolight Opto belong to the PB2D series of single-watt Power LED UV diodes. They are available in a small 3.5 x 3.5mm casing and emit long-range ultraviolet radiation (UV-C) of about 10.5mW.
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Prolight Opto UV-C diodes for professional use
Miniature 1W DC/DC converters by Recom
Miniature 1W DC/DC converters by Recom
ROE is a series of DC/DC converters with 1W output power. The family of products is manufactured by RECOM, a renowned company specializing in converters.
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Transistor drivers with high-side and low-side referenced outputs
TME offer now includes a new IX2113 integrated circuit by IXYS. It is designed to control a MOSFET or IGBT type transistor gateway, where high switching speed is important. The output circuit is composed of two independent high-side and low-side referenced channels capable of sourcing and sinking 2A.
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Transistor drivers with high-side and low-side referenced outputs
DSO1000B series handheld oscilloscopes by Hantek
DSO1000B series handheld oscilloscopes by Hantek
DSO1000B is a series of affordable, dual channel oscilloscopes with a built-in battery and a multimeter function. The bandwidth, depending on the model, is 60MHz DSO1062B or 200MHz DSO1202B. A large, colour, 5.7" display with a resolution of 640x480 pixels provides high readability and ease of use. The oscilloscope sample rate is 1Gs/sec and the memory depth is 1Mpts/ch.
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Noise suppression sheets by KEMET – forget about problems with interference
Self-adhesive noise suppression sheets by KEMET are designed to eliminate noise and high frequency interference. They are perfect for reducing electromagnetic interference (EMI) generated by electronic devices or suppressing radio frequency interference (RFI). Thanks to the use of modern materials, the sheets are thin and flexible, and their operating temperature ranges from -40°C to 105°C.
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Noise suppression sheets by KEMET – forget about problems with interference
Low-voltage stepper motor controller
Low-voltage stepper motor controller
TME offer includes a stepper motor controller by POLOLU, based on the STSPIN220 chip. This product is available in two versions – with and without soldered connectors. The module can cooperate with bipolar stepper motors at 1.8V to 10V operating voltage and maximum current of 1.1A per phase (without using a heatsink). The controller offers step resolution from full steps to 1/256. Selection is made by appropriate configuration of signals on M0-M4 inputs.
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51M-STA series cylindrical solenoids
51M-STA series cylindrical solenoids provide high force at a low spindle stroke and have a long service life and reliability. The entire STA series is based on a low-friction system between the spindle and the coil housing, ensuring 25 million trouble-free solenoid activations. Furthermore, STA solenoids are shock and vibration resistant, so they can be used in extreme environmental conditions.
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51M-STA series cylindrical solenoids
BAHCO set of insulated wrenches
BAHCO set of insulated wrenches
The quality of insulated tools and manufacturing precision considerably impact the safety of electricians. Only a trusted manufacturer guarantees proper craftsmanship of accessories that meet high requirements of experts in troubleshooting electrical installations and devices.
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s-Sense modules from R&D SOFTWARE SOLUTIONS
TME’s offer features miniature modules for monitoring environmental conditions from R&D SOFTWARE SOLUTIONS. The manufacturer offers the modules in several different variants differing in terms of the number and type of embedded sensors.
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s-Sense modules from R&D SOFTWARE SOLUTIONS
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Calendary
BATTERY JAPAN, Tokyo, 3.3.-5.3.2021
BATTERY JAPAN, Osaka, 29.9.-1.10.2021
DistribuTECH, 25.1.-27.1.2022, Dallas, TX
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DistribuTECH, 23.1.-25.1.2024, Indianapolis, IN
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