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Thermal breakers protect circuits from excess current in a similar way to a fuse, however, they often feature a switch allowing them to be reset if tripped. Common types of thermal breakers include thermal magnetic circuit breakers and thermal automotive circuit breakers.
Types of Thermal Breakers
Thermal magnetic circuit breakers are devices that provide protection against overcurrent in circuits. Circuit breakers use an automatically operated electrical switch to disrupt the flow of current when an overload or short circuit is detected. Thermal magnetic circuit breakers do this using an electromagnet and bimetallic strips.
Circuit breakers provide more sophisticated protection against overcurrent than a simple fuse. Fuses simply burn out and have to be replaced, whereas circuit breakers just need to be reset.
Thermal automotive circuit breakers are devices used to break the flow of current in automotive circuits, in order to protect them against a fault such as overcurrent or short circuit.
The thermal aspect of this type of circuit breaker allows for smaller overcurrents over a longer period of time, but will quickly trip the circuit for larger overcurrents. This is useful in the case of motors, as there will be a small overcurrent each time the engine is switched on for a short length of time, which should not trip the circuit.
What are thermal magnetic circuit breakers used for?
Thermal magnetic circuit breakers are most often used in distribution boards. They make up part of the subsidiary circuits in the broader electrical supply system, protecting against overcurrent.
What are thermal automotive circuit breakers used for?
Thermal automotive circuit breakers are used to protect electrical networks in most types of vehicles, including cars, vans, buses, and boats.
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Thermal Overcurrent Circuit Breakers
Thermal circuit breakers (circuit protectors, resettable fuses, circuit breakers for equipment protection) are ideally suited to overload protection of motors, transformers, magnetic valves, on-board electrical systems and low voltage lines.
The trip time of thermal circuit breakers depends on the height and of the duration of the overload current and the ambient temperature. With higher current ratings, the bimetal or hot wire is heated up until the defined trip time is reached and the device ensures genuine physical isolation of the contacts.
Thermal circuit breaker, integral type, single pole
Thermal circuit breaker for pcb mounting, single pole
Thermal circuit breaker for snap-in mounting, single pole
Thermal circuit breaker for threadneck panel mounting, single pole
Thermal circuit breaker with manual release button, plug-in or snap in panel mounting
Thermal automotive circuit breaker with manual release, for base mounting
Push-push thermal switch/circuit breaker combination, single pole
Single pole thermal reset circuit breaker
Single pole thermal circuit breaker, integral type
Thermal circuit breaker for snap-in panel mounting, single pole
Thermal circuit breaker for threadneck panel mounting, double pole, one pole thermally protected
Thermal automotive circuit breaker with automatic reset function
Miniaturised thermal automotive circuit breaker with colour-coded manual release
Thermal circuit breaker, plug-in type, single pole, switching function optional
Thermal circuit breaker for snap-in panel mounting, rocker operated, fast acting
Miniaturised thermal circuit breaker for pcb mounting, fast acting
Miniaturised thermal circuit breaker for threadneck panel mounting, fast acting
Automotive thermal circuit breaker, colour-coded housing, standard fuseblock mounting
Automotive thermal circuit breaker with manual release option
Automotive thermal circuit breaker with automatic reset function
Single pole, thermal miniaturised circuit breaker designed for automotive applications
Single pole thermal reset circuit breaker in a miniaturised design intended for threadneck or snap-in mounting, dimensions: 32.0 x 27.0 x 13.6 mm.
3120-N, thermal circuit breaker, snap-in mounting, 1-pole, 2-pole
Thermal circuit breaker with rocker actuation, single, double or three pole
Thermal circuit breaker with rocker actuation, single pole, water splash protected (IP66)
Single pole three-position switch, water splash protected (IP66)
Thermal circuit breaker with push buttons, three pole
Thermal circuit breaker for threadneck panel mounting
Thermal circuit breaker for flange mounting and manual release option
Thermal circuit breaker with threadneck, push-push actuation
Thermal circuit breaker for threadneck panel mounting, with auxiliary contacts
Single pole bimetal operated motor protection control, surface mounting, autoreset
Interactive Virtual Sample Kit
E-T-A's new interactive sample case features circuit breakers, relays, and power distribution modules. With the click of your mouse you can:
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Fuse vs. circuit breaker: How to choose the right device for your application
Is a fuse or circuit breaker best for your design? Here are some pointers to help you decide. Three main factors go into choosing between circuit breakers and fuses: Convenience for the user, cost, and degree of protection. This white paper will give you guidance on what circuit protection device is best for your equipment.
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12 Most Common Mistakes When Specifying Circuit Protection for Equipment
It's only a circuit breaker. Yet there is enough complexity and confusion when it comes to specifying circuit protection that many engineers are designing equipment with too little or too much protection. Under protected circuits leave equipment vulnerable to damaging electrical surges. Over protected circuits add cost and can lead to nuisance tripping. Like Goldilocks and the three bears, the goal is to specify circuit protection that is "just right".
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Thermal Circuit Breaker
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Thermal Switch Circuit Breaker Overload Protect 3A 4A 5A 6A 7A 8A 10A 15A 18A
Thermal switch circuit breaker overload protect 3a,4a,5a,6a,7a,8a,10a,15a,18a, techna t16 thermal circuit breaker panel mount with dust cap 3a to 30a, new listing siemens ground fault circuit interrupter qf115ap qpf2 15a upc 887621216542, geya mcb circuit breaker single pole sp 6ka 6 10 16 25 32 40 50 63 80 100 125amp, new listing 10pk leviton lb115-aft 15a 1-pole plug-on afci branch circuit breaker, thermal, new listing (25a)dc miniature circuit breaker miniature circuit breaker 2p dc550v thermal, geya mcb mini circuit breaker double pole 6 10 16 25 32 40 50 63 80 100 125amp, new listing us thermal overload circuit breaker kuoyuh 88 series 3-25a 125/250vac 50/60hz, new listing qot22020 square d 20 amp circuit breaker *next day option*, 125/250vac 20a 20 amp circuit thermal breaker thermal protector for generator*oa, new listing ge 20a 600v circuit breaker - thed136020, new listing geya ac mini circuit breaker 1p 10ka 6/10/16/25/32/40/50/63/80/100/125a switch, circuit breaker overload 3a 4a 5a 6a 7a 8a 10a 11a 12a 13a 14a 15 18a 20a 23a, new listing siemens b245 45-amp double pole 120/240-volt 10kaic bolt in breaker, lb120-t 20a 1-pole plug-on standard branch circuit breaker thermal magnetic 12, 1pcs thermal switch circuit breaker overload protector overload switch pocdy/b$, new listing siemens q22020ct 120/240v two 20a / 20 amp double pole circuit breaker, thermal circuit breaker thermal switch self resetting temperature protector push, new listing new in box ge fbv26te030r2 record plus circuit breaker 30a thermal 2-pole 600v, 1pcs thermal switch circuit breaker overload protector overload switch p;wl, new listing lot of 10 square d qob120 bolt-on circuit breaker 20a 240v 1p 1ph qob 240 volt, new listing lot of 6 general electric thql1115 plug-in circuit breaker 15a 240v 1p 1ph thql, new listing new eaton jw4250f jw circuit breaker 250a 4pole 600v adjustable thermal mag trip, new listing thermal overload circuit breaker kuoyuh 98 series 7/10/15/20/25...50a 125/250vac, new listing square d fa36060 thermal magnetic circuit breaker 60a, new listing siemens bqd230 bolt-on circuit breaker 30a 480v 2p 1ph bqd used 30 amp 480 volt, new listing circuit breaker thermal volt 12-50v 125-250v equipment security control, new listing geya ac mini circuit breaker 2p 10ka 6/10/16/25/32/40/50/63/80/100/125a switch, durable thermal circuit breaker blade fuse suitable for automotive use, new listing square d q232200a thermal magnetic circuit breaker 200a, circuit breaker thermal cutout thermal 12-50v 1pcs brand new circuit breakers, new listing siemens q120 plug-in circuit breaker 20a 240v 1p 1ph q used 20 amp 240 volt, new listing square d ehb34015 bolt-on circuit breaker 15a 480v 3p 3ph ehb 15 amp 480 volt, new listing eaton qbhw3060h bolt-on circuit breaker 60a 240v 3p 3ph qbhw used 60 amp, geya ac circuit breaker mcb 6ka 1p+n c curve b curve 6 10 16 20 25 32 40a 230v, used 15/30 amp cutler hammer quad bq2302115 a2302115 240v 4p circuit breaker, new listing 1- new ge thql1130 trip circuit breaker 30 amp single pole, tyco w28 fuseholder type thermal p&b circuit breaker - 7 amp - 250 vac - 32 vdc, 1x thermal switch circuit breaker overload protector overload switch seju, new listing square d qo270 2 pole 70 amp 120/240 volt qo breaker plug new, eaton br120 thermal magnetic circuit breaker - black, new listing ge thql1125 plug-in circuit breaker 25a 240v 1p 1ph thql used 25 amp 240 volt, eaton br280 80a thermal magnetic circuit breaker - black, eaton cutler hammer bab3015h 15 3 pole 240v thermal magnetic circuit breaker, new listing square d q232225h thermal magnetic circuit breaker 225a.