{"id":77268,"date":"2026-07-06T15:33:47","date_gmt":"2026-07-06T13:33:47","guid":{"rendered":"https:\/\/circutor.com\/uncategorized\/cuando-instalar-proteccion-diferencial-tipo-b\/"},"modified":"2026-07-07T13:23:32","modified_gmt":"2026-07-07T11:23:32","slug":"when-to-install-type-b-residual-current-protection","status":"publish","type":"post","link":"https:\/\/circutor.com\/en\/articles\/when-to-install-type-b-residual-current-protection\/","title":{"rendered":"When to install Type B residual current protection"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text css=”.vc_custom_1783421837352{margin-top: 20px !important;margin-bottom: 20px !important;}”]<\/p>\n

The introduction of electronic control systems has optimized energy management and the automation of production processes. These technologies, based on converting alternating current (AC) into direct current (DC), require appropriate protection to ensure the safety of both people and installations in the event of faults on either side of the system.<\/h4>\n

[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=”10″ equal_height=”yes”][vc_column width=”1\/2″][vc_column_text css=”.vc_custom_1783421870270{margin-top: 20px !important;margin-bottom: 20px !important;}”]This applies to common equipment such as variable speed drives, inverters, uninterruptible power supplies, electric vehicle charging points, office equipment, and LED systems<\/strong>, all of which are found in both industrial applications and everyday use.[\/vc_column_text][\/vc_column][vc_column width=”1\/2″][vc_column_text css=”.vc_custom_1783421914376{margin-top: 20px !important;margin-bottom: 20px !important;}”]When protecting people and installations<\/strong> against potential DC faults or leakage currents, Type A, AC, or F residual current devices<\/strong> do not detect DC leakage currents. This can compromise service continuity, cause fires, or even prove fatal.[\/vc_column_text][\/vc_column][\/vc_row][vc_row full_width=”stretch_row” css=”.vc_custom_1783082102930{background: #92CDE0 url(https:\/\/circutor.com\/wp-content\/uploads\/2026\/07\/art-protect-B-fons-blau.jpg?id=76819) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}”][vc_column][vc_column_text css=”.vc_custom_1783421948231{margin-top: 20px !important;margin-bottom: 20px !important;padding-top: 20px !important;padding-bottom: 20px !important;}”]<\/p>\n

For this reason, it is essential to use Type B residual current protection in installations where alternating current, pulsating direct current, high-frequency, or direct current leakage currents may occur.<\/span><\/em><\/h4>\n

[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1783070047350{margin-top: 20px !important;}”][vc_column][vc_column_text css=”.vc_custom_1783422001032{margin-top: 20px !important;margin-bottom: 20px !important;}”]<\/p>\n

Criteria for installing residual current devices in series<\/h2>\n

When installing residual current devices in series upstream of the load, the device should not be selected based solely on the type of load. Other factors must also be considered to ensure proper coordination of the protection system.<\/p>\n

To ensure vertical selectivity<\/strong>, three conditions must always be met: current, time, and type selectivity<\/strong>.[\/vc_column_text][\/vc_column][\/vc_row][vc_row gap=”10″ equal_height=”yes”][vc_column width=”1\/3″ css=”.vc_custom_1783332114232{background-color: #FFEAEA !important;border-radius: 15px !important;}”][vc_column_text css=”.vc_custom_1783422082730{margin-bottom: 20px !important;padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;}”]\"Selectividad<\/p>\n

Current selectivity<\/h3>\n

The sensitivity of an upstream residual current device<\/strong> must always be lower than that of the device installed downstream. This ensures that, if a leakage current occurs, the device closest to the affected part of the installation trips first, preventing the entire circuit from being disconnected.<\/p>\n

To ensure this selectivity, the upstream device should be set<\/strong> with a residual operating current approximately three times higher<\/strong> than that of the downstream device.[\/vc_column_text][\/vc_column][vc_column width=”1\/3″ css=”.vc_custom_1783332148572{background-color: #FFEAEA !important;border-radius: 15px !important;}”][vc_column_text css=”.vc_custom_1783422187321{margin-bottom: 20px !important;padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;}”]\"Selectividad<\/p>\n

Time selectivity<\/h3>\n

As with sensitivity, the trip time<\/strong> of an upstream residual current device must always be longer<\/strong> than that of the device installed downstream.<\/p>\n

This ensures that, in the event of a leakage current, the residual current device closest to the fault trips first. To maintain time selectivity<\/strong>, the upstream time delay should be set to approximately twice<\/strong> that of the downstream device.[\/vc_column_text][\/vc_column][vc_column width=”1\/3″ css=”.vc_custom_1783332159043{background-color: #FFEAEA !important;border-radius: 15px !important;}”][vc_column_text css=”.vc_custom_1783422231876{margin-bottom: 20px !important;padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;}”]\"Selectividad<\/p>\n

Selectivity by type of residual current protection<\/h3>\n

Another important consideration is selecting the correct type of residual current protection<\/strong>. The upstream device should always be of the same type as, or a higher type than, the device installed downstream.<\/p>\n

This ensures service continuity and prevents nuisance trips that could affect the entire installation.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=”76748″ img_size=”large” alignment=”center” css=”.vc_custom_1783330363629{margin-top: 40px !important;margin-bottom: 40px !important;padding-right: 40px !important;padding-left: 40px !important;}”][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1783068982335{padding-top: 20px !important;padding-right: 20px !important;padding-bottom: 20px !important;padding-left: 20px !important;background-color: #F3F4F5 !important;border-radius: 15px !important;}”][vc_column][vc_column_text css=”.vc_custom_1783422283720{margin-top: 20px !important;margin-bottom: 40px !important;}”]\"Soluciones<\/p>\n

Circutor Type B residual current protection solutions<\/h2>\n

To meet the growing need to protect these types of loads, Circutor<\/strong> offers a wide range of Type B residual current protection solutions<\/strong>.[\/vc_column_text][vc_row_inner content_placement=”middle” css=”.vc_custom_1783330479125{margin-top: 20px !important;border-top-width: 3px !important;border-top-color: #FFFFFF !important;border-top-style: solid !important;}”][vc_column_inner][vc_column_text css=”.vc_custom_1783422779099{margin-top: 20px !important;margin-bottom: 20px !important;}”]<\/p>\n

RGU-100B<\/h3>\n

The RGU-100B<\/strong><\/a> is a residual current relay designed for use with WGB<\/strong><\/a> series current transformers and RS-485 communications via Modbus RTU. It supports transformers with internal diameters of up to 140 mm, and can protect loads of up to 630 A.<\/p>\n

\"RGU-100B\"\"WGB\"<\/p>\n

The device can be configured with sensitivities from 30 mA and offers both instantaneous and time-delayed tripping. It also displays the leakage current level at the time of the trip, making it easier to fine-tune the sensitivity to suit the installation’s requirements.<\/p>\n

In addition, it records AC leakage current, DC leakage current, or the combined AC+DC leakage current, helping to identify the source of the fault quickly and easily.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=”middle” css=”.vc_custom_1783330489293{margin-top: 20px !important;border-top-width: 3px !important;border-top-color: #FFFFFF !important;border-top-style: solid !important;}”][vc_column_inner][vc_column_text css=”.vc_custom_1783422951334{margin-top: 20px !important;margin-bottom: 20px !important;}”]<\/p>\n

RGU-110B<\/h3>\n

The RGU-110B<\/strong><\/a> is a Type B residual current protection electronic relay designed to detect and manage leakage currents in modern electrical installations.<\/p>\n

\"RGU-110B\"\"WB\"<\/p>\n

Together with the WB<\/strong><\/a>\u00a0transformers, it protects and monitors all electrical installations where, due to the type of load, the applicable law or manufacturer’s requirement, it is necessary to install Type B earth leakage protection.<\/p>\n

The RGU-110B<\/strong><\/a> series features transformers to protect loads up to 4000 A, allowing proper type coordination in sub-panels or main panels, and the protection of large loads such as variable speed drives.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][vc_row_inner content_placement=”middle” css=”.vc_custom_1783330501285{margin-top: 20px !important;border-top-width: 3px !important;border-top-color: #FFFFFF !important;border-top-style: solid !important;}”][vc_column_inner][vc_column_text css=”.vc_custom_1783423111406{margin-top: 20px !important;margin-bottom: 20px !important;}”]<\/p>\n

CBS-400B<\/h3>\n

The CBS-400B<\/strong><\/a> is a residual current relay designed for use with WGB<\/strong><\/a> series current transformers and RS-485 communications via Modbus RTU. It supports transformers with internal diameters of up to 140 mm, and can protect loads of up to 630 A.<\/p>\n

\"CBS-400B\"\"WGB\"<\/p>\n

The device can be configured with sensitivities from 30 mA and provides four independent channels to protect four completely separate circuits within just three DIN rail modules. It also offers both instantaneous and time-delayed tripping.<\/p>\n

Like the RGU-100B<\/strong><\/a>, it displays and records AC leakage current, DC leakage current, or the combined AC+DC leakage current.[\/vc_column_text][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1782997223423{margin-top: 40px !important;margin-bottom: 40px !important;}”][vc_column][vc_column_text css=””]\"Revisa<\/p>\n

Always review equipment manuals<\/h2>\n

We recommend that you carefully review the manuals for equipment such as three-phase variable speed drives, inverters, charging points, and uninterruptible power supplies.<\/p>\n

Manufacturers of AC\/DC conversion equipment specify that the only way to ensure adequate protection is through the use of Type B<\/strong><\/a> residual current devices.<\/p>\n

This ensures that the protection system operates correctly, helps prevent accidents, and maintains continuity of the electrical supply.[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text css=”.vc_custom_1783421837352{margin-top: 20px !important;margin-bottom: 20px !important;}”] The introduction of electronic control systems has optimized energy management and the automation of production processes. These technologies, based on converting alternating current (AC) into direct current (DC), require appropriate protection to ensure the safety of both people and installations in the event of faults on either side of […]<\/p>\n","protected":false},"author":7,"featured_media":76764,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[3521],"tags":[3588,3825,3580],"class_list":["post-77268","post","type-post","status-publish","format-standard","hentry","category-articles","tag-electrical-protection","tag-energy-efficiency","tag-grid-quality"],"acf":[],"yoast_head":"\nWhen to install Type B residual current protection | Circutor<\/title>\n<meta name=\"description\" content=\"Discover when to install Type B residual current protection\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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