{"id":176162,"date":"2025-11-19T19:00:00","date_gmt":"2025-11-19T16:00:00","guid":{"rendered":"https:\/\/bukvaved.top\/v-chjom-raznica-mezhdu-predohraniteljami-b-i-c\/"},"modified":"2026-10-28T16:04:58","modified_gmt":"2026-10-28T13:04:58","slug":"what-is-the-difference-between-bic-predohraniteljami","status":"publish","type":"post","link":"https:\/\/bukvaved.top\/en\/v-chjom-raznica-mezhdu-predohraniteljami-b-i-c\/","title":{"rendered":"What is the difference between fuses B and C?"},"content":{"rendered":"<p><strong>A type B fuse differs from a type C fuse in its tripping characteristics: in the event of a short circuit, a type B fuse will trip immediately at 3 to 5 times its rated current, while a type C fuse will only trip at 5 to 10 times its rated current.<\/strong> Therefore, a Type B fuse is more sensitive and is standard in typical household lighting and outlet circuits, while a Type C fuse is better able to withstand the high starting currents of motors, pumps, and compressors. Both fuses perform equally well under overload conditions.<\/p>\n<p> To sum it up<\/p>\n<ul>\n<li> <strong>B<\/strong> \u2013 short-circuit protection is triggered at a voltage of 3\u20135 \u00d7 In; typical lighting and socket circuits in apartments and houses.<\/li>\n<li> <strong>C<\/strong> \u2013 short-circuit protection tripping at 5\u201310 \u00d7 In; circuits with motors and devices with high starting current.<\/li>\n<li> <strong>B16 and C16<\/strong> have the same rated current (16 A) and react to overload in a similar way - they differ in the response threshold for a short circuit.<\/li>\n<li> Replacing B with C should not be done in &quot;test mode&quot; - for this it is necessary to have the installation checked <strong>licensed electrician<\/strong> .<\/li>\n<\/ul>\n<h2> What do the letters B and C on a fuse mean?<\/h2>\n<p> What is commonly referred to as a &quot;fuse&quot; is <strong>overcurrent protection circuit breaker<\/strong> (circuit breaker). Its body has a type designation <strong>B16<\/strong> or <strong>C20<\/strong> : the letter indicates <strong>response characteristic<\/strong> , and the number is on <strong>rated current<\/strong> in amperes. Characteristics B, C, and D are described in the PN-EN 60898-1 standard for circuit breakers for household and similar installations.<\/p>\n<p> The circuit breaker has two mechanisms. <strong>Thermal (bimetallic) fuse<\/strong> It operates with a delay in case of overload, for example, when too many devices are connected to one circuit. <strong>Electromagnetic fuse<\/strong> It trips almost instantly during a short circuit. Characteristic B or C determines the tripping threshold of the latter \u2013 as a multiple of the rated current (In).<\/p>\n<h2> Fuse B \u2013 characteristics and application<\/h2>\n<p> Automatic circuit breaker with characteristic <strong>B<\/strong> triggers instantly when current is applied <strong>, 3\u20135 times greater than its rated current<\/strong> . For the B16 characteristic, this range is 48\u201380 A, and for the B10, 30\u201350 A. Thanks to the low threshold value, it quickly disconnects the power supply in the event of a short circuit, even in long circuits where the short-circuit current is relatively small.<\/p>\n<p> Type B fuses are used in typical circuits <strong>lighting, sockets and controls<\/strong> , providing power to low-inrush current receivers such as lighting fixtures, pipe sealants, computers, chargers, most household appliances and heating devices.<\/p>\n<h2> Type C fuse \u2013 characteristics and application<\/h2>\n<p> Automatic circuit breaker with characteristic <strong>C<\/strong> triggers instantly when current is applied <strong>, 5\u201310 times greater than its rated current<\/strong> . For C16, this is 80\u2013160 A. It is less sensitive to short-term current surges, so it does not trip the circuit when starting devices that consume several times more current at startup than during operation.<\/p>\n<p> Type C fuses are used in power supply circuits <strong>electric motors<\/strong> (pumps, hydraulic accumulators, compressors, fans, machine tools), transformer equipment, and other consumers with high starting currents. They are typical for workshops, farms, and manufacturing plants. There is also a type characteristic <strong>\u0414<\/strong> (10\u201320 \u00d7 In) for consumers with very high starting currents.<\/p>\n<h2> What is the difference between fuses B16 and C16 (and between fuses B20 and C20)?<\/h2>\n<p> The number in the designation is the same, so both switches pass 16 A in normal operation and <strong>protect the wire from overload in the same way<\/strong> . Typically, the breaker will not trip at 1.13 x In for an hour and will trip at 1.45 x In in less than an hour \u2013 this applies to both breaker B and breaker C.<\/p>\n<p> The difference concerns short-circuit ratings: circuit breaker B16 trips instantly at 48\u201380 A, while C16 trips at 80\u2013160 A. Similarly, B20 trips at 60\u2013100 A, while C20 trips at 100\u2013200 A. This is important for safety: to automatically disconnect power in the event of an insulation fault, the circuit must carry a current at least equal to the upper limit of its rating. Therefore, circuit breaker C requires twice the short-circuit current as circuit breaker B with the same rated current\u2014and this depends on the impedance of the short-circuit loop, the length, and the cross-section of the conductors.<\/p>\n<table>\n<tbody>\n<thead>\n<tr>\n<th> Characteristic<\/th>\n<th> Fuse B<\/th>\n<th> Fuse C<\/th>\n<\/tr>\n<\/thead>\n<\/tbody>\n<tbody>\n<tr>\n<td> <strong>Short circuit protection tripped<\/strong><\/td>\n<td> 3\u20135 \u00d7 B<\/td>\n<td> 5\u201310 \u00d7 B<\/td>\n<\/tr>\n<tr>\n<td> <strong>Example: 16A<\/strong><\/td>\n<td> B16: 48\u201380 A<\/td>\n<td> C16: 80\u2013160 A<\/td>\n<\/tr>\n<tr>\n<td> <strong>Example: 20A<\/strong><\/td>\n<td> B20: 60\u2013100 A<\/td>\n<td> C20: 100\u2013200 A<\/td>\n<\/tr>\n<tr>\n<td> <strong>Overload protection<\/strong><\/td>\n<td> Same as in C.<\/td>\n<td> Same as in point B.<\/td>\n<\/tr>\n<tr>\n<td> <strong>Required short-circuit current in the circuit<\/strong><\/td>\n<td> Below<\/td>\n<td> A higher value is important in long chains.<\/td>\n<\/tr>\n<tr>\n<td> <strong>Typical use<\/strong><\/td>\n<td> Lighting, sockets, household electrical networks.<\/td>\n<td> Engines, pumps, compressors, workshops<\/td>\n<\/tr>\n<tr>\n<td> <strong>Starting current of receivers<\/strong><\/td>\n<td> Small<\/td>\n<td> Exalted<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2> Which fuse is used in the house - B or C?<\/h2>\n<p> In a typical apartment or private house <strong>Type B switches are used as a basis.<\/strong> Lighting circuits are most often protected by B10 switches, and sockets by B16 switches, but the specific rating is always selected based on the wire cross-section, wiring diagram, and load. Typical household appliances plugged into sockets generally do not require a type C rating.<\/p>\n<p> Characteristic <strong>\u00ab&quot;WITH&quot;\u00bb<\/strong> Used in homes with appliances that operate with higher inrush currents\u2014for example, a water pump, well pump, compressor, or workshop equipment. If the &quot;C&quot; characteristic regularly trips when starting a particular device, do not replace it yourself with a device with a &quot;C&quot; characteristic or one with a higher rated current. A faulty device or installation could also be the cause, and replacing it without testing could prevent the circuit breaker from tripping in the event of a short circuit.<\/p>\n<p> <strong>Important:<\/strong> the selection and replacement of protective devices must be carried out <strong>licensed electrician<\/strong> , which will check the wire cross-section and measure the short-circuit resistance. Working on a live distribution board carries a risk of electric shock.<\/p>\n<h3> Pre-meter protection \u2013 option B or C?<\/h3>\n<p> The choice of meter protection is based on the connection capacity and requirements <strong>distribution network operator,<\/strong> Specified in the connection conditions. Depending on the operator, this may be a circuit breaker with specific characteristics, a fuse link, or a selective circuit breaker used to ensure that the circuit breaker, rather than the main protection, trips in the event of a short circuit in the house. The decision is made by the designer or electrician based on the connection conditions.<\/p>\n<h2> Frequently Asked Questions (FAQ)<\/h2>\n<p> <strong>What is the difference between fuses B and C?<\/strong><\/p>\n<p> Short-circuit tripping threshold. Type B trips instantly at a current 3-5 times greater than the rated current, while type C trips at a current 5-10 times greater than the rated current. Type B is used in typical household circuits, while type C is used in circuits with motors and devices with high inrush currents.<\/p>\n<p> <strong>Which fuse is used in the house - B or C?<\/strong><\/p>\n<p> Typical lighting and outlet circuits use type B switches (most commonly B10 and B16). Type C switches are used in circuits with devices that have high inrush currents, such as water heaters. The final choice is left to the electrician.<\/p>\n<p> <strong>What is the difference between fuses B16 and C16?<\/strong><\/p>\n<p> Both are rated for 16 A and have the same overload response. B16 trips instantly during short circuits at 48\u201380 A, while C16 trips instantly at 80\u2013160 A, so C16 is better able to withstand inrush currents but requires higher short-circuit current.<\/p>\n<p> <strong>Can I replace fuse B with fuse C myself?<\/strong><\/p>\n<p> This is not recommended. This change changes the conditions for protection against electric shock\u2014a higher short-circuit current is required for circuit breaker C to trip promptly. First, measure the short-circuit loop resistance and assess the wiring condition by consulting a licensed electrician.<\/p>\n<p> <strong>Is a type B+C surge protector the same as a type B and C fuse?<\/strong><\/p>\n<p> No. In surge arresters, the B+C designation (type 1+2 is now more common) indicates the protection class against overvoltage, such as lightning strikes. It has no relation to the B or C ratings of circuit breakers.<\/p>\n<h2> See also<\/h2>\n<ul>\n<li> What is the difference between alternating current and direct current?<\/li>\n<li> What is the difference between LR20 and R20 batteries?<\/li>\n<li> What is the difference between a 16A outlet and a 32A outlet?<\/li>\n<li> What is the difference between a lithium-ion battery and a lithium-polymer battery?<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A type B fuse differs from a type C fuse in its tripping characteristics: in the event of a short circuit, a type B fuse will trip immediately<\/p>","protected":false},"author":1,"featured_media":176163,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[67,20],"tags":[70],"class_list":["post-176162","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vopros-otvet","category-fakty","tag-chem-otlichaetsya"],"_links":{"self":[{"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/posts\/176162","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/comments?post=176162"}],"version-history":[{"count":1,"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/posts\/176162\/revisions"}],"predecessor-version":[{"id":176164,"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/posts\/176162\/revisions\/176164"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/media\/176163"}],"wp:attachment":[{"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/media?parent=176162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/categories?post=176162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bukvaved.top\/en\/wp-json\/wp\/v2\/tags?post=176162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}