MCB Inrush & Trip Curve Checker (B\/C\/D) | JUTRION<\/title>\n<style>\nbody{margin:0;padding:32px 20px;background:#ffffff;}\n\/* JUTRION calculators \u2014 paste this ONCE into WordPress: Appearance \u2192 Customize \u2192 Additional CSS.\n Everything is scoped under .jt-calc so it never affects the rest of your site. *\/\n.jt-calc{\n --navy:#142c4e; --blue:#008de4; --blue-dark:#0871bd; --blue-soft:#e9f5fd;\n --ink:#172536; --muted:#617186; --line:#dfe7f0; --surface:#ffffff; --panel:#f7fafd;\n --green:#107652; --green-soft:#e5f6ee; --amber:#9a6200; --amber-soft:#fff4da; --bad:#b23524; --bad-soft:#fdece9;\n --mono:ui-monospace,\"SFMono-Regular\",Consolas,monospace;\n max-width:1040px; margin:0 auto; color:var(--ink);\n font-family:Inter,\"Segoe UI\",Arial,sans-serif; line-height:1.6; font-size:16px; -webkit-font-smoothing:antialiased;\n}\n.jt-calc *{box-sizing:border-box}\n.jt-calc .eyebrow{margin:0 0 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var(--line);padding:13px 0}\n.jt-calc .jt-faq summary{cursor:pointer;font-weight:700;list-style:none;color:var(--navy)}\n.jt-calc .jt-faq summary::-webkit-details-marker{display:none}\n.jt-calc .jt-faq summary::before{content:\"+ \";color:var(--blue);font-family:var(--mono)}\n.jt-calc .jt-faq details[open] summary::before{content:\"\u2212 \"}\n.jt-calc .jt-std{margin-top:22px;padding:14px 16px;border:1px dashed #c7d4e2;border-radius:9px;background:var(--surface);font-size:12px;color:var(--muted)}\n.jt-calc .jt-std strong{color:var(--navy);text-transform:uppercase;letter-spacing:.06em;font-size:10px;display:block;margin-bottom:5px}\n.jt-calc .jt-fine{font-size:13px;color:var(--muted);margin-top:22px}\n\n<\/style>\n<\/head>\n<body>\n\n<div class=\"jt-calc\">\n <p class=\"eyebrow\">Circuit protection<\/p>\n <h1>MCB Inrush & Trip Curve Checker (B \/ C \/ D)<\/h1>\n <p class=\"tool-lede\">Check whether a chosen MCB rating and curve will ride through the load inrush without nuisance tripping, and still clear the prospective fault current in the instantaneous magnetic band. Enter the rating, curve, inrush peak, and fault level to compare against the B, C, and D magnetic-trip ranges of IEC 60898-1.<\/p>\n\n <div class=\"jt-card\"><div class=\"jt-grid\">\n <div class=\"jt-inputs\">\n <div class=\"jt-two\">\n <div class=\"jt-field\"><label for=\"jt-in\">MCB rated current I<sub>n<\/sub> (A)<\/label><input type=\"number\" id=\"jt-in\" value=\"16\" min=\"1\" step=\"1\" inputmode=\"numeric\"><\/div>\n <div class=\"jt-field\"><label for=\"jt-curve\">Trip curve<\/label>\n <select id=\"jt-curve\"><option value=\"B\">B \u2014 3\u20135 \u00d7 In<\/option><option value=\"C\" selected>C \u2014 5\u201310 \u00d7 In<\/option><option value=\"D\">D \u2014 10\u201320 \u00d7 In<\/option><\/select>\n <\/div>\n <\/div>\n <div class=\"jt-field\"><label for=\"jt-inrush\">Peak inrush current (A)<\/label><input type=\"number\" id=\"jt-inrush\" value=\"90\" min=\"0\" step=\"1\" inputmode=\"numeric\" placeholder=\"e.g. 6\u20138 \u00d7 motor FLC\"><\/div>\n <div class=\"jt-field\"><label for=\"jt-isc\">Prospective fault current I<sub>sc<\/sub> (kA)<\/label><input type=\"number\" id=\"jt-isc\" value=\"1.5\" min=\"0\" step=\"0.1\" inputmode=\"decimal\"><\/div>\n <div class=\"jt-note\"><span>\u24d8<\/span><span>Inrush is a peak, not the steady load: a DOL motor draws roughly 6\u20138 \u00d7 its full-load current, a transformer 10\u201325 \u00d7 its rated current for a few cycles.<\/span><\/div>\n <\/div>\n <div class=\"jt-readout\">\n <div><div class=\"jt-rl\">Magnetic trip band<\/div><div class=\"jt-level\" id=\"jt-band\">80\u2013160 A<\/div><\/div>\n <div class=\"jt-rec\"><div class=\"k\">Inrush ride-through<\/div><div style=\"margin-top:6px\"><span class=\"jt-pill no\" id=\"jt-p1\">May nuisance-trip \u2014 inrush in band<\/span><\/div><\/div>\n <div class=\"jt-rec\"><div class=\"k\">Instantaneous fault trip<\/div><div style=\"margin-top:6px\"><span class=\"jt-pill ok\" id=\"jt-p2\">Assured \u2014 Isc 1.5 kA \u2265 160 A<\/span><\/div><\/div>\n <div class=\"jt-rec row\"><div class=\"k\">Suggested curve<\/div><div class=\"v\" id=\"jt-sugg\">Curve D<\/div><\/div>\n <button type=\"button\" class=\"jt-copy\" id=\"jt-copy\">Copy result<\/button>\n <\/div>\n <\/div><\/div>\n\n <div class=\"jt-content\">\n <h2>What the curve controls<\/h2>\n <p>The B, C, and D letters set the <b>instantaneous magnetic trip band<\/b> \u2014 the multiple of rated current at which the MCB trips within milliseconds. Below that band the breaker only responds on its slower thermal element; above it, it trips instantly.<\/p>\n <div class=\"jt-eq\">Magnetic band = [ low \u00d7 I<sub>n<\/sub> , high \u00d7 I<sub>n<\/sub> ]\nB: 3\u20135 \u00d7 In C: 5\u201310 \u00d7 In D: 10\u201320 \u00d7 In<\/div>\n <p>A usable curve has to satisfy two opposite conditions at once:<\/p>\n <ul>\n <li><b>Ride through inrush:<\/b> the peak inrush should stay <i>below<\/i> the lower edge of the band, or the breaker nuisance-trips every time the load energises.<\/li>\n <li><b>Clear the fault fast:<\/b> the prospective fault current should reach or exceed the <i>upper<\/i> edge of the band, so a real fault is cleared in the instantaneous region rather than on the thermal curve.<\/li>\n <\/ul>\n\n <h2>Choosing between B, C and D<\/h2>\n <div class=\"jt-table-wrap\"><table>\n <thead><tr><th>Curve<\/th><th>Magnetic band<\/th><th>Typical load<\/th><\/tr><\/thead>\n <tbody>\n <tr><td class=\"mono\">B<\/td><td class=\"mono\">3\u20135 \u00d7 In<\/td><td>Resistive, lighting, long cable runs \u2014 low inrush, low fault level<\/td><\/tr>\n <tr><td class=\"mono\">C<\/td><td class=\"mono\">5\u201310 \u00d7 In<\/td><td>General distribution, sockets, small motors \u2014 the common default<\/td><\/tr>\n <tr><td class=\"mono\">D<\/td><td class=\"mono\">10\u201320 \u00d7 In<\/td><td>Transformers, large motors, capacitor banks \u2014 high inrush<\/td><\/tr>\n <\/tbody>\n <\/table><\/div>\n <p>On a weak supply or a long final circuit, a high curve can fail to reach its magnetic threshold on an earth fault, so the disconnection time is set by the thermal element and may exceed the limit. That is why B and C curves are preferred where the fault level is low, and the earth-fault-loop impedance must always be verified against the required disconnection time.<\/p>\n\n <div class=\"jt-note\"><span>\u26a0<\/span><span><b>The band is a screen, not the real curve.<\/b> Manufacturing tolerance, temperature, DC components, and the exact let-through of the device shift the actual trip point. Confirm against the manufacturer’s published time\u2013current curve before finalising.<\/span><\/div>\n\n <h2>Frequently asked questions<\/h2>\n <div class=\"jt-faq\">\n <details><summary>My motor breaker keeps tripping on start \u2014 what should I change?<\/summary><p>The start inrush is likely reaching the magnetic band. Move to a higher curve (C\u2192D) or a higher rating if the cable allows, so the lower band edge sits above the inrush peak. Confirm the fault level still reaches the new, higher band.<\/p><\/details>\n <details><summary>Does a higher curve make the breaker “stronger”?<\/summary><p>No. The curve only shifts the instantaneous threshold. Breaking capacity (I<sub>cn<\/sub>) is a separate rating and must still exceed the prospective fault current.<\/p><\/details>\n <details><summary>Why can a D curve be unsafe on a long circuit?<\/summary><p>If the fault current at the far end never reaches 10 \u00d7 In, the breaker will not trip magnetically and disconnection relies on the thermal element, which can be too slow. Use a lower curve or verify the loop impedance.<\/p><\/details>\n <\/div>\n\n <div class=\"jt-cta\">\n <h2>Select the MCB<\/h2>\n <p>With the rating and curve screened, match the breaking capacity and pole count to a device for your market.<\/p>\n <div class=\"jt-cta-btns\">\n <a class=\"jt-btn\" href=\"https:\/\/jutrion.com\/mcb\/\">Explore JUTRION MCBs<\/a>\n <a class=\"jt-btn ghost\" href=\"https:\/\/jutrion.com\/contact\/\">Get a free quote<\/a>\n <\/div>\n <p class=\"jt-related\">Related products: <a href=\"https:\/\/jutrion.com\/mcb\/\">MCB<\/a> \u00b7 <a href=\"https:\/\/jutrion.com\/rcbo\/\">RCBO<\/a> \u00b7 <a href=\"https:\/\/jutrion.com\/mccb\/\">MCCB<\/a><\/p>\n <\/div>\n\n <div class=\"jt-std\"><strong>Standards referenced<\/strong>IEC 60898-1 (MCB rated current, B\/C\/D instantaneous bands, I<sub>cn<\/sub>) \u00b7 IEC 60364-4-41 (disconnection times & loop impedance).<\/div>\n <p class=\"jt-fine\">Screening estimate for guidance only. The final device, curve, and breaking capacity must be confirmed by a qualified person against the manufacturer’s time\u2013current curve, the measured fault level, and the earth-fault-loop impedance.<\/p>\n <\/div>\n<\/div>\n\n<script>\n(function(){\n var $=function(id){return document.getElementById(id);};\n var inn=$('jt-in'),curve=$('jt-curve'),inrush=$('jt-inrush'),isc=$('jt-isc'),\n bandEl=$('jt-band'),p1=$('jt-p1'),p2=$('jt-p2'),sugg=$('jt-sugg');\n var BANDS={B:[3,5],C:[5,10],D:[10,20]};\n function setPill(el,cls,txt){el.className='jt-pill '+cls;el.textContent=txt;}\n function calc(){\n var In=parseFloat(inn.value),ir=parseFloat(inrush.value),sc=parseFloat(isc.value)*1000,b=BANDS[curve.value];\n if(!(In>0)){bandEl.textContent='\u2014';setPill(p1,'na','\u2014');setPill(p2,'na','\u2014');sugg.textContent='\u2014';return;}\n var lo=b[0]*In,hi=b[1]*In;\n bandEl.textContent=Math.round(lo)+'\u2013'+Math.round(hi)+' A';\n var okIr=(ir>=0); if(okIr)okIr=(inrush.value!=='');\n if(okIr){\n if(ir<lo)setPill(p1,'ok','Rides through \u2014 inrush '+Math.round(ir)+' A < '+Math.round(lo)+' A');\n else if(ir<=hi)setPill(p1,'no','May nuisance-trip \u2014 inrush in band');\n else setPill(p1,'no','Trips on inrush \u2014 '+Math.round(ir)+' A > '+Math.round(hi)+' A');\n } else setPill(p1,'na','enter inrush');\n if(sc>0){\n if(sc>=hi)setPill(p2,'ok','Assured \u2014 Isc '+(sc\/1000).toFixed(1)+' kA \u2265 '+Math.round(hi)+' A');\n else if(sc>=lo)setPill(p2,'no','Not guaranteed instantaneous');\n else setPill(p2,'no','Below band \u2014 thermal only');\n } else setPill(p2,'na','enter Isc');\n var order=['B','C','D'],best='\u2014';\n for(var i=0;i<order.length;i++){var bb=BANDS[order[i]],l=bb[0]*In,h=bb[1]*In;\n var cA=(!(ir>0)||ir<l),cB=(!(sc>0)||sc>=h);\n if(cA)if(cB){best='Curve '+order[i];break;}}\n sugg.textContent=best;\n }\n [inn,curve,inrush,isc].forEach(function(el){el.addEventListener('input',calc);el.addEventListener('change',calc);});\n $('jt-copy').addEventListener('click',function(){var b=$('jt-copy');var txt='MCB: '+inn.value+' A, Curve '+curve.value+'\\nMagnetic band: '+bandEl.textContent+'\\nInrush check: '+p1.textContent+'\\nFault check: '+p2.textContent+'\\nSuggested curve: '+sugg.textContent;navigator.clipboard.writeText(txt).then(function(){var o=b.textContent;b.textContent='Copied \u2713';setTimeout(function(){b.textContent=o;},1500);}).catch(function(){b.textContent='Press Ctrl+C';});});\n calc();\n})();\n<\/script>\n\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>MCB Inrush & Trip Curve Checker (B\/C\/D) | JUTRION Circuit protection MCB Inrush & Trip Curve Checker (B \/ C \/ D) Check whether a chosen MCB rating and curve will ride through the load inrush without nuisance tripping, and still clear the prospective fault current in the instantaneous magnetic band. Enter the rating, curve, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1778,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1818","page","type-page","status-publish","hentry"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/comments?post=1818"}],"version-history":[{"count":2,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1818\/revisions"}],"predecessor-version":[{"id":1864,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1818\/revisions\/1864"}],"up":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1778"}],"wp:attachment":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/media?parent=1818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":1818,"date":"2026-07-27T10:32:22","date_gmt":"2026-07-27T02:32:22","guid":{"rendered":"https:\/\/jutrion.com\/?page_id=1818"},"modified":"2026-07-27T21:23:24","modified_gmt":"2026-07-27T13:23:24","slug":"comprobador-de-curva-de-irrupcion-de-mcb","status":"publish","type":"page","link":"https:\/\/jutrion.com\/es\/tools\/mcb-inrush-curve-checker\/","title":{"rendered":"verificador de curva de mcb"},"content":{"rendered":"\n\n\n\n\n\nMCB Inrush & Trip Curve Checker (B\/C\/D) | JUTRION<\/title>\n<style>\nbody{margin:0;padding:32px 20px;background:#ffffff;}\n\/* JUTRION calculators \u2014 paste this ONCE into WordPress: Appearance \u2192 Customize \u2192 Additional CSS.\n Everything is scoped under .jt-calc so it never affects the rest of your site. *\/\n.jt-calc{\n --navy:#142c4e; --blue:#008de4; --blue-dark:#0871bd; --blue-soft:#e9f5fd;\n --ink:#172536; --muted:#617186; --line:#dfe7f0; --surface:#ffffff; --panel:#f7fafd;\n --green:#107652; --green-soft:#e5f6ee; --amber:#9a6200; 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.jt-fine{font-size:13px;color:var(--muted);margin-top:22px}\n\n<\/style>\n<\/head>\n<body>\n\n<div class=\"jt-calc\">\n <p class=\"eyebrow\">Circuit protection<\/p>\n <h1>MCB Inrush & Trip Curve Checker (B \/ C \/ D)<\/h1>\n <p class=\"tool-lede\">Check whether a chosen MCB rating and curve will ride through the load inrush without nuisance tripping, and still clear the prospective fault current in the instantaneous magnetic band. Enter the rating, curve, inrush peak, and fault level to compare against the B, C, and D magnetic-trip ranges of IEC 60898-1.<\/p>\n\n <div class=\"jt-card\"><div class=\"jt-grid\">\n <div class=\"jt-inputs\">\n <div class=\"jt-two\">\n <div class=\"jt-field\"><label for=\"jt-in\">MCB rated current I<sub>n<\/sub> (A)<\/label><input type=\"number\" id=\"jt-in\" value=\"16\" min=\"1\" step=\"1\" inputmode=\"numeric\"><\/div>\n <div class=\"jt-field\"><label for=\"jt-curve\">Trip curve<\/label>\n <select id=\"jt-curve\"><option value=\"B\">B \u2014 3\u20135 \u00d7 In<\/option><option value=\"C\" selected>C \u2014 5\u201310 \u00d7 In<\/option><option value=\"D\">D \u2014 10\u201320 \u00d7 In<\/option><\/select>\n <\/div>\n <\/div>\n <div class=\"jt-field\"><label for=\"jt-inrush\">Peak inrush current (A)<\/label><input type=\"number\" id=\"jt-inrush\" value=\"90\" min=\"0\" step=\"1\" inputmode=\"numeric\" placeholder=\"e.g. 6\u20138 \u00d7 motor FLC\"><\/div>\n <div class=\"jt-field\"><label for=\"jt-isc\">Prospective fault current I<sub>sc<\/sub> (kA)<\/label><input type=\"number\" id=\"jt-isc\" value=\"1.5\" min=\"0\" step=\"0.1\" inputmode=\"decimal\"><\/div>\n <div class=\"jt-note\"><span>\u24d8<\/span><span>Inrush is a peak, not the steady load: a DOL motor draws roughly 6\u20138 \u00d7 its full-load current, a transformer 10\u201325 \u00d7 its rated current for a few cycles.<\/span><\/div>\n <\/div>\n <div class=\"jt-readout\">\n <div><div class=\"jt-rl\">Magnetic trip band<\/div><div class=\"jt-level\" id=\"jt-band\">80\u2013160 A<\/div><\/div>\n <div class=\"jt-rec\"><div class=\"k\">Inrush ride-through<\/div><div style=\"margin-top:6px\"><span class=\"jt-pill no\" id=\"jt-p1\">May nuisance-trip \u2014 inrush in band<\/span><\/div><\/div>\n <div class=\"jt-rec\"><div class=\"k\">Instantaneous fault trip<\/div><div style=\"margin-top:6px\"><span class=\"jt-pill ok\" id=\"jt-p2\">Assured \u2014 Isc 1.5 kA \u2265 160 A<\/span><\/div><\/div>\n <div class=\"jt-rec row\"><div class=\"k\">Suggested curve<\/div><div class=\"v\" id=\"jt-sugg\">Curve D<\/div><\/div>\n <button type=\"button\" class=\"jt-copy\" id=\"jt-copy\">Copy result<\/button>\n <\/div>\n <\/div><\/div>\n\n <div class=\"jt-content\">\n <h2>What the curve controls<\/h2>\n <p>The B, C, and D letters set the <b>instantaneous magnetic trip band<\/b> \u2014 the multiple of rated current at which the MCB trips within milliseconds. Below that band the breaker only responds on its slower thermal element; above it, it trips instantly.<\/p>\n <div class=\"jt-eq\">Magnetic band = [ low \u00d7 I<sub>n<\/sub> , high \u00d7 I<sub>n<\/sub> ]\nB: 3\u20135 \u00d7 In C: 5\u201310 \u00d7 In D: 10\u201320 \u00d7 In<\/div>\n <p>A usable curve has to satisfy two opposite conditions at once:<\/p>\n <ul>\n <li><b>Ride through inrush:<\/b> the peak inrush should stay <i>below<\/i> the lower edge of the band, or the breaker nuisance-trips every time the load energises.<\/li>\n <li><b>Clear the fault fast:<\/b> the prospective fault current should reach or exceed the <i>upper<\/i> edge of the band, so a real fault is cleared in the instantaneous region rather than on the thermal curve.<\/li>\n <\/ul>\n\n <h2>Choosing between B, C and D<\/h2>\n <div class=\"jt-table-wrap\"><table>\n <thead><tr><th>Curve<\/th><th>Magnetic band<\/th><th>Typical load<\/th><\/tr><\/thead>\n <tbody>\n <tr><td class=\"mono\">B<\/td><td class=\"mono\">3\u20135 \u00d7 In<\/td><td>Resistive, lighting, long cable runs \u2014 low inrush, low fault level<\/td><\/tr>\n <tr><td class=\"mono\">C<\/td><td class=\"mono\">5\u201310 \u00d7 In<\/td><td>General distribution, sockets, small motors \u2014 the common default<\/td><\/tr>\n <tr><td class=\"mono\">D<\/td><td class=\"mono\">10\u201320 \u00d7 In<\/td><td>Transformers, large motors, capacitor banks \u2014 high inrush<\/td><\/tr>\n <\/tbody>\n <\/table><\/div>\n <p>On a weak supply or a long final circuit, a high curve can fail to reach its magnetic threshold on an earth fault, so the disconnection time is set by the thermal element and may exceed the limit. That is why B and C curves are preferred where the fault level is low, and the earth-fault-loop impedance must always be verified against the required disconnection time.<\/p>\n\n <div class=\"jt-note\"><span>\u26a0<\/span><span><b>The band is a screen, not the real curve.<\/b> Manufacturing tolerance, temperature, DC components, and the exact let-through of the device shift the actual trip point. Confirm against the manufacturer’s published time\u2013current curve before finalising.<\/span><\/div>\n\n <h2>Frequently asked questions<\/h2>\n <div class=\"jt-faq\">\n <details><summary>My motor breaker keeps tripping on start \u2014 what should I change?<\/summary><p>The start inrush is likely reaching the magnetic band. Move to a higher curve (C\u2192D) or a higher rating if the cable allows, so the lower band edge sits above the inrush peak. Confirm the fault level still reaches the new, higher band.<\/p><\/details>\n <details><summary>Does a higher curve make the breaker “stronger”?<\/summary><p>No. The curve only shifts the instantaneous threshold. Breaking capacity (I<sub>cn<\/sub>) is a separate rating and must still exceed the prospective fault current.<\/p><\/details>\n <details><summary>Why can a D curve be unsafe on a long circuit?<\/summary><p>If the fault current at the far end never reaches 10 \u00d7 In, the breaker will not trip magnetically and disconnection relies on the thermal element, which can be too slow. Use a lower curve or verify the loop impedance.<\/p><\/details>\n <\/div>\n\n <div class=\"jt-cta\">\n <h2>Select the MCB<\/h2>\n <p>With the rating and curve screened, match the breaking capacity and pole count to a device for your market.<\/p>\n <div class=\"jt-cta-btns\">\n <a class=\"jt-btn\" href=\"https:\/\/jutrion.com\/mcb\/\">Explore JUTRION MCBs<\/a>\n <a class=\"jt-btn ghost\" href=\"https:\/\/jutrion.com\/contact\/\">Get a free quote<\/a>\n <\/div>\n <p class=\"jt-related\">Related products: <a href=\"https:\/\/jutrion.com\/mcb\/\">MCB<\/a> \u00b7 <a href=\"https:\/\/jutrion.com\/rcbo\/\">RCBO<\/a> \u00b7 <a href=\"https:\/\/jutrion.com\/mccb\/\">MCCB<\/a><\/p>\n <\/div>\n\n <div class=\"jt-std\"><strong>Standards referenced<\/strong>IEC 60898-1 (MCB rated current, B\/C\/D instantaneous bands, I<sub>cn<\/sub>) \u00b7 IEC 60364-4-41 (disconnection times & loop impedance).<\/div>\n <p class=\"jt-fine\">Screening estimate for guidance only. The final device, curve, and breaking capacity must be confirmed by a qualified person against the manufacturer’s time\u2013current curve, the measured fault level, and the earth-fault-loop impedance.<\/p>\n <\/div>\n<\/div>\n\n<script>\n(function(){\n var $=function(id){return document.getElementById(id);};\n var inn=$('jt-in'),curve=$('jt-curve'),inrush=$('jt-inrush'),isc=$('jt-isc'),\n bandEl=$('jt-band'),p1=$('jt-p1'),p2=$('jt-p2'),sugg=$('jt-sugg');\n var BANDS={B:[3,5],C:[5,10],D:[10,20]};\n function setPill(el,cls,txt){el.className='jt-pill '+cls;el.textContent=txt;}\n function calc(){\n var In=parseFloat(inn.value),ir=parseFloat(inrush.value),sc=parseFloat(isc.value)*1000,b=BANDS[curve.value];\n if(!(In>0)){bandEl.textContent='\u2014';setPill(p1,'na','\u2014');setPill(p2,'na','\u2014');sugg.textContent='\u2014';return;}\n var lo=b[0]*In,hi=b[1]*In;\n bandEl.textContent=Math.round(lo)+'\u2013'+Math.round(hi)+' A';\n var okIr=(ir>=0); if(okIr)okIr=(inrush.value!=='');\n if(okIr){\n if(ir<lo)setPill(p1,'ok','Rides through \u2014 inrush '+Math.round(ir)+' A < '+Math.round(lo)+' A');\n else if(ir<=hi)setPill(p1,'no','May nuisance-trip \u2014 inrush in band');\n else setPill(p1,'no','Trips on inrush \u2014 '+Math.round(ir)+' A > '+Math.round(hi)+' A');\n } else setPill(p1,'na','enter inrush');\n if(sc>0){\n if(sc>=hi)setPill(p2,'ok','Assured \u2014 Isc '+(sc\/1000).toFixed(1)+' kA \u2265 '+Math.round(hi)+' A');\n else if(sc>=lo)setPill(p2,'no','Not guaranteed instantaneous');\n else setPill(p2,'no','Below band \u2014 thermal only');\n } else setPill(p2,'na','enter Isc');\n var order=['B','C','D'],best='\u2014';\n for(var i=0;i<order.length;i++){var bb=BANDS[order[i]],l=bb[0]*In,h=bb[1]*In;\n var cA=(!(ir>0)||ir<l),cB=(!(sc>0)||sc>=h);\n if(cA)if(cB){best='Curve '+order[i];break;}}\n sugg.textContent=best;\n }\n [inn,curve,inrush,isc].forEach(function(el){el.addEventListener('input',calc);el.addEventListener('change',calc);});\n $('jt-copy').addEventListener('click',function(){var b=$('jt-copy');var txt='MCB: '+inn.value+' A, Curve '+curve.value+'\\nMagnetic band: '+bandEl.textContent+'\\nInrush check: '+p1.textContent+'\\nFault check: '+p2.textContent+'\\nSuggested curve: '+sugg.textContent;navigator.clipboard.writeText(txt).then(function(){var o=b.textContent;b.textContent='Copied \u2713';setTimeout(function(){b.textContent=o;},1500);}).catch(function(){b.textContent='Press Ctrl+C';});});\n calc();\n})();\n<\/script>\n\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>MCB Inrush & Trip Curve Checker (B\/C\/D) | JUTRION Circuit protection MCB Inrush & Trip Curve Checker (B \/ C \/ D) Check whether a chosen MCB rating and curve will ride through the load inrush without nuisance tripping, and still clear the prospective fault current in the instantaneous magnetic band. Enter the rating, curve, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1778,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1818","page","type-page","status-publish","hentry"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/comments?post=1818"}],"version-history":[{"count":2,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1818\/revisions"}],"predecessor-version":[{"id":1864,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1818\/revisions\/1864"}],"up":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/pages\/1778"}],"wp:attachment":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/media?parent=1818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}