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Circuit breaker - Are you sure that your electrical installation offers correct protection against overcurrents? Errors in protection can have dangerous consequences. Read here what you should pay attention to and the importance of the high-quality miniature circuit breakers from our eibabo® online shop.The use of electronic devices is a matter of course for us. Their use is comfortable and safe. But what happens if the television, washing machine, oven or refrigerator has a short circuit or overcurrent? These devices would be permanently damaged and fire accidents would be the result if suitable protective mechanisms were not activated as quickly as possible. In everyday life, hardly anyone thinks about these dangers. Why is that? Various safety elements are integrated in today's electrical installations, which protect people, electrical devices or the circuits themselves from damage caused by overcurrent. Modern miniature circuit breakers, among others, perform this task. They are also called circuit breakers or fuses. Do you remember?Historically, fuses contained a metal wire or strip that would melt if overcurrented, interrupting the flow of current. As a result, a tripped fuse was destroyed and had to be replaced. These so-called safety fuses are still used today, for example in vehicle construction. Circuit breakers work differently, can be reactivated manually after tripping and thus offer obvious advantages over fuses.What are circuit breakers?All non-adjustable circuit breakers are referred to as miniature circuit breakers, also known as MCBs. MCB is the abbreviation for the English term 'Miniature Circuit Breaker'. It is always an overcurrent protective device in the electrical installation when used in low-voltage networks. Miniature circuit breakers protect lines from damage caused by heating up as a result of excessive current, usually caused by a short circuit. The miniature circuit breaker is a reusable safety element that does not reset itself automatically. This makes handling very safe and you can quickly restore the power supply after it has been triggered. There are no high maintenance and replacement costs. Combinations of a miniature circuit breaker (MCB) with a residual current device (RCCB) are also available, these combined devices are referred to as RCBO devices (English: 'Residual current operated Circuit-Breaker with Overcurrent protection').What were the different miniature circuit breakers developed for?The miniature circuit breakers available from eibabo® differ not only in their rated current and design, but also in their tripping characteristics. The following standardized tripping characteristics are currently permitted for miniature circuit breakers:Type B (standard line protection)Type B miniature circuit breakers are the usual variants for private use. These switch off the circuit as soon as the current exceeds three to five times the actual current flow. Type C (higher inrush current for machines or lamp groups)Type C switches are used, among other things, in household appliances and in commercial devices such as fluorescent tubes, PCs, printers and servers. These break the circuit when the current exceeds five to ten times the actual current flow. Type D (for highly inductive or capacitive loads, e.g. with transformers, magnets or capacitors)Type D MCBs offer high resistance. These turn off the circuit when the current exceeds ten to twenty times the actual current flow. Type E (SLS / circuit breakers for main lines)SLS stands for 'Selective Circuit Breaker'. This triggers with a time delay when the current exceeds 5 to 6.25 times the actual nominal current. This means that downstream fuses or classic miniature circuit breakers switch off the current beforehand. Type K (with high inrush current with sensitive overload tripping)Type K miniature circuit breakers trip at eight to twelve times the actual current flow. These protect heavy-duty equipment such as compressors, winding motors and X-ray machines. Type Z (semiconductor protection with high line impedance)Type Z miniature circuit breakers are sensitive to short circuits and are used in semiconductor production. These break the circuit when the current exceeds two to three times the actual rated current. Image: Hager MCN316 miniature circuit breaker 3-poleIs the installation of miniature circuit breakers absolutely necessary?Miniature circuit breakers for lighting circuits and socket circuits are mandatory in the circuit distributors of apartments and residential buildings. You must install these. For industrial installations, in industrial plants and in trade, please pay attention to the higher requirements for miniature circuit breakers. Here, miniature circuit breakers / MCBs often also protect equipment and devices.How does a circuit breaker work?Miniature circuit breakers usually have two trigger mechanisms, the electromagnetic quick release and the thermal release. When an overcurrent flows through the circuit breaker, a bimetallic strip in the thermal trip unit heats up and bends. This triggers an interlock, interrupting the flow of current in the circuit. This process protects against hazards or damage to devices that can result from the overload. In addition, the melting of the lines is prevented. In the event of a short circuit, the electromagnetic trigger acts. Here the current suddenly increases and a magnetic field builds up inside a coil. A bolt reacts to this, hitting the trigger mechanism in fractions of a second and interrupting the circuit.NoticeIn the circuit breaker, the outer switching lever is not directly connected to the actual switching mechanism. The device also triggers reliably if the shift lever is jammed, locked or manipulated.To get the current flow going again, the circuit breaker can be reactivated using the shift lever.What is the difference between single-pole and multi-pole miniature circuit breakers?You use single-pole miniature circuit breakers, for example, for circuits with single-phase alternating current. Three-pole miniature circuit breakers are used in AC circuits with three current-carrying phases. In the event of an overcurrent or short circuit, these are able to switch off all phases. This happens even if the fault affects only one phase. recommendationWe advise you to protect multi-phase circuits with a multi-pole circuit breaker. Do not divide the individual phases into single-pole circuit breakers. Working with electricity is dangerous. Please have changes or extensions to your system carried out by a specialist electrician.Which miniature circuit breakers are recommended?A large selection of miniature circuit breakers for electrical distribution installation can be found in the eibabo® online catalogue. We carry high-quality and reliable miniature circuit breakers from well-known and well-known manufacturers such as Siemens, ETA, ABL Sursum, ABB Stotz S&J, Eaton, Hager, Schneider Electric or from Moeller, Doepke and Stahl.  Catalogue content:In this eibabo® catalogue Circuit breakers and fuses > Miniature circuit breaker (MCB) you will find items from the following product groups:Item overview:AC circuit breakerAC voltage machineAuxiliary circuitBuilt-in deviceBuilt-in distributor deviceBuilt-in machineBusbar automatBusbar fuseCable circuit breakerCircuit breakerControl circuit breakerDC circuit breakerDC voltageDirect currentDirect current machineEnergy TechnologyHigh performance circuit breakerInstallation machineMCB circuit breakerModular installation deviceMotor protection switchOvercurrent protectionOvercurrent switchPlug-in circuit breakerRail mounted devicesScrew circuit breakerShort circuitTax securityfrom the following manufacturers:Manufacturer overview catalogue Circuit breaker:ABBABNBachmannDoepkeEatonETAHagerMurrelektronikPhoenixSchneider ElectricSiemensStahl
Circuit breaker transf. protect. - By using a circuit breaker, you ensure that no increased inrush current flows when you switch on a machine or another electrical consumer. A circuit breaker for transformers also performs this task, except that it is tailored to the corresponding needs of the transformer used in each case. But what does that mean? Transformers that can withstand high inrush currents usually work with high losses, which means they run hot. However, this can be critical if other components of the overall construction do not tolerate high heat dissipation. In contrast, low-loss transformers are not designed for higher inrush currents. To put it simply, this fundamental problem is due to the design of the respective transformer or the structure of its core. With high-quality circuit breakers from the eibabo online shop that are tailored to your installation, you can protect your transformers against short circuits and overloads. With an integrated control input, such a circuit breaker for transformers also functions as a relay for switching the device on and off.Catalogue content:In this eibabo® catalogue Low-voltage industrial components > Power circuit-breaker for trafo/generator/installation protection you will find items from the following product groups:Item overview:AutomaticBasic switchBuilt-in deviceBuilt-in distributor deviceCircuit breakerCircuit breaker for cable protectionCircuit breaker for transformer protectionCircuit breakers for system protectionCircuit breakers for transformer, generator and system protectionDifferential currentGenerator circuit breakerHigh power switchManual operationMCCBMini circuit breakerModular installation deviceMolded case circuit breakerPower circuit-breaker for trafo/generator/installation prot.Power circuit-breaker for trafo/generator/installation protectionPower-cut-out switchSelective circuit breakerSelective protectionShort circuit protectionSlide-in technologySwitchSystem circuit breakerTransformer circuit breakerVoltage transformer circuit breakerfrom the following manufacturers:Manufacturer overview catalogue Circuit breaker transf. protect.:ABBEatonHagerMitsubishiRockwellSchneider ElectricSiemens
Power switches motor protect. - Do you want to protect an electric motor from damage caused by overload or short circuits and need a motor protection switch for this? In this catalog from the eibabo® shop, we present a wide variety of circuit breakers for reliable motor protection. Read here how to find the right device and what you should pay attention to when buying it.Large machine parks are in operation, especially in industrial production. A correct function before and also after unforeseen events is of the utmost importance here. But even on a small scale, the electric motors used should function stably. For this reason, machines are protected against disturbances in the power supply and against overloads. Such errors occur, for example, due to improper maintenance, leaks, wear and tear or simple short circuits. Constant protection of the health and life of machine operators is just as important. Therefore, electricians and occupational safety specialists pay close attention to the implementation of all necessary measures to maintain business operations and protect employees. Motor protection switches are a component of such a safety package.What is a motor protection circuit breaker?The motor protection switch is a switching device for controlling the electric motor. The device serves to switch on, switch off and conduct current in the normal state of the circuit. The switch also has the task of automatically switching off the engine in emergency situations. The main function of motor protection switches is to protect devices from overload and short-circuit currents. When the rated current is exceeded, the circuit breakers shut off the power, ensuring the safety of electrical equipment and people.What is meant by thermal and magnetic motor protection?The tripping characteristic of a circuit breaker for motor protection is usually based on built-in thermomagnetic protection. This standard includes:protection against short circuits via a magnetic circuit breakerprotection against overload by means of a thermal circuit breaker  TIP:For safety reasons, we recommend always choosing a combined motor protection switch with both types of protection. The magnetic circuit breaker for short-circuit protection must respond quickly in the event of a high current. This type of protection is precise, reliable and economical. Ambient temperature changes do not affect tripping characteristics. Compared to thermal circuit breakers, magnetic circuit breakers have more precisely defined trigger parameters. The magnetic circuit breaker uses an electromagnetic mechanism. This is dimensioned differently according to the respective performance specifications of the motor protection switch. When the current reaches a certain threshold, the circuit is immediately broken. As a rule, this is set in such a way that tripping only occurs at ten times or more than the normal operating current of the motor. This avoids tripping during normal engine starting.The thermal circuit breaker for overload protection reacts with a delay because a motor usually draws a higher current when starting. This type of protection is one of the most reliable and economical types of protection for electric motors. These handle high starting currents and protect the motor from failures caused, for example, by a blocked rotor. The thermal overload protection works with a bimetallic strip. Deformation occurs when the bimetal is heated to a critical temperature by the current flowing to the motor. This indicates that the power consumption is continuously too high. The motor is under excessive load and may stall or otherwise fail. A special feature of thermal circuit breakers is their temperature compensation. In this way, a precise triggering behavior defined according to the respective calibration is guaranteed at different ambient temperatures.Image: Eaton PKZM0-1 motor protection switchWhat circumstances can cause a motor protection switch to trip?A wide variety of faults can occur during the operation of an electric motor. It is therefore important to be aware of these dangers, assess the probability of failure and anticipate possible causes. In this way, a motor can be optimally protected. An electric motor can fail or be damaged under the following conditions:Poor power quality due to high voltage, under voltage, surges, frequency change, incorrect installation or malfunction of the electric motor itselfGradual increase in temperature or reaching and exceeding the permissible limit values due to frequent switching on and off, insufficient cooling, high ambient temperature, reduced atmospheric pressure, high temperature of the working medium or excessive viscosity of the working mediumSudden rise in temperature due to blockages in the motor drive or phase failure Where are motor protection switches installed?The most common motor protection switches are designed as built-in devices. Alternatively, depending on the model, it can be installed in the control cabinet on the DIN rail. Mounting directly on the machine is obvious, because a machine is usually switched ON and OFF via the motor protection switch. Manual power on is done by pressing the start button labeled 'I' or '1'. Depending on the version, this can also be a rotary switch. Manual shutdown is done by pressing the stop button or turning the switch position back to '0'.What should be considered when selecting a motor protection switch?Basically, when selecting a circuit breaker for motor protection, you should be guided by three criteria: the rated current, the overload current and the short-circuit current. The rated current of the machine is the maximum allowable current at which the circuit breaker can remain on indefinitely. However, it is of no use if the switch is correctly selected in terms of current rating, and the wiring does not withstand the load, melts and causes a short circuit. Choose the motor protection switch not only according to the nominal power of the machine, but also the cable cross-section and the quality of the wiring. Thermal overload protection suitable for your system and magnetic protection against short circuits should be considered on the same premises.Notice:With motor protection switches, a mechanical load on the device cannot be ruled out. The switches are therefore often made of very robust and self-extinguishing plastic.When buying, make sure you choose a brand you trust. A motor protection switch must function reliably and, in an emergency, have the declared properties. This cannot be guaranteed without a doubt for no-name items. The price difference to a high-quality original is not that big when you compare the safety of man and machine. Therefore, opt for products from trusted manufacturers such as ABB, ABL, Condor, Eaton, Hager, Helios, Maico, Rockwell, Schneider Electric, Siemens and Stahl.Convince yourself of the quality of our articles. Your purchase is always protected by our buyer protection. We ship worldwide and offer you the shortest possible delivery time.  Catalogue content:In this eibabo® catalogue Low-voltage industrial components > Motor protection circuit-breaker you will find items from the following product groups:Item overview:AC voltageAlternating currentBasic switchCircuit breakerControl unitEngine outputEngine protectionEngine starterEngine switchLoad current switchLoad disconnectorLoad switchLow voltage circuit breakerLow voltage switchMolded case circuit breakerMotor protection functionMotor protection switchMotor protection switch systemOverload protectionShort circuit protectionSpring terminalStarter combinationStarter combinationsSwitch disconnectorTransformer circuit breakerfrom the following manufacturers:Manufacturer overview catalogue Power switches motor protect.:ABBCondorEatonHagerMaicoRockwellSchneider ElectricSiemensStahl
Motor starter combination - The motor starter combinations offered in the eibabo online shop consist of two components, the motor protection switch and the circuit breaker. Thanks to their versatile and safe installation technology, these can be installed and connected quickly and flexibly. By using such a motor starter combination, you reliably ensure the safety of your machines and the people working on them. In addition, you will also find basic devices for starting engines, direct starters and direct starters, hybrid motor starters, reversing combinations and branch devices in this eibabo catalogue. All of these items are of high quality, come from manufacturers such as Schneider, Siemens, Phoenix and Eaton and work precisely and reliably. Use one of our many secure payment methods when shopping. In addition, your transactions are always protected by Trusted Shops buyer protection.Catalogue content:In this eibabo® catalogue Low-voltage industrial components > Motor starter/Motor starter combination you will find items from the following product groups:Item overview:Circuit breakerCombination plug-in technologyCompact starterConsumer feederContactor automaticDirect starterEngine managementEngine outputEngine protectionEngine starterEngine starter combinationFeed switchMotor feeder combinationMotor Feeder StarterMotor protection switchMotor protective circuit-breakerMotor starterMotor starter combinationMotor starter/Motor starter combinationProtected starterRepair switchReversing contactorReversing starterScrew contactor combinationStar-delta starterStarterThree-phase contactorTrigger blockfrom the following manufacturers:Manufacturer overview catalogue Motor starter combination:DoldEatonPhoenixSchneider ElectricSiemensWöhner
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RECOMMENDED
3D
Hager - HTS335E - Selective miniature circuit breaker 35A, 3-pole, E-Character. HTS335E
¥840.25 excl. VAT

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plus shipping
(¥2,976.91 RRP***)
Selective miniature circuit breaker 35A, 3-pole, E-Character.
Hager
| HTS335E
RECOMMENDED
3D
Hager - HTN335E - Selective miniature circuit breaker 35A, 3-pole, E-Character. HTN335E
¥935.17 excl. VAT

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plus shipping
(¥2,922.46 RRP***)
Selective miniature circuit breaker 35A, 3-pole, E-Character.
Hager
| HTN335E
RECOMMENDED
3D
Hager - HTS363E - Selective miniature circuit breaker, 3-pole, E-63A, for SS HTS363E
¥863.49 excl. VAT

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plus shipping
(¥3,130.51 RRP***)
Selective miniature circuit breaker, 3-pole, E-63A, for SS
Hager
| HTS363E
RECOMMENDED
3D
Hager - HTS350E - Selective miniature circuit breaker 50A, 3-pole, E-Character. HTS350E
¥840.25 excl. VAT

*

plus shipping
(¥3,093.13 RRP***)
Selective miniature circuit breaker 50A, 3-pole, E-Character.
Hager
| HTS350E
RECOMMENDED
3D
Hager - HTS340E - Selective miniature circuit breaker 40A, 3-pole, E-Character. HTS340E
¥840.25 excl. VAT

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plus shipping
(¥3,052.49 RRP***)
Selective miniature circuit breaker 40A, 3-pole, E-Character.
Hager
| HTS340E
RECOMMENDED
3D
Hager - HTN350E - Selective miniature circuit breaker 50A, 3-pole, E-Character. HTN350E
¥935.17 excl. VAT

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plus shipping
(¥3,044.37 RRP***)
Selective miniature circuit breaker 50A, 3-pole, E-Character.
Hager
| HTN350E
RECOMMENDED
3D
Hager - HTN363E - Selective miniature circuit breaker 63A, 3-pole, E-Character. HTN363E
¥960.36 excl. VAT

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plus shipping
(¥3,093.13 RRP***)
Selective miniature circuit breaker 63A, 3-pole, E-Character.
Hager
| HTN363E
RECOMMENDED
3D
RECOMMENDED
3D
Hager - HTS325E - Selective miniature circuit breaker 25A, 3-pole, E-Character. HTS325E
¥840.25 excl. VAT

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plus shipping
(¥2,881.01 RRP***)
Selective miniature circuit breaker 25A, 3-pole, E-Character.
Hager
| HTS325E
RECOMMENDED
3D
RECOMMENDED
3D
Hager - HTN340E - Selective miniature circuit breaker 40A, 3-pole, E-Character. HTN340E
¥935.17 excl. VAT

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plus shipping
(¥2,994.79 RRP***)
Selective miniature circuit breaker 40A, 3-pole, E-Character.
Hager
| HTN340E
RECOMMENDED
3D
Hager - HTN380E - Selective miniature circuit breaker, 3-pole, E-80A, for HS HTN380E
¥2,009.07 excl. VAT

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plus shipping
(¥3,158.96 RRP***)
Selective miniature circuit breaker, 3-pole, E-80A, for HS
Hager
| HTN380E
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