{"id":29590,"date":"2025-12-05T09:15:54","date_gmt":"2025-12-05T09:15:54","guid":{"rendered":"https:\/\/swgct.net\/?post_type=product&#038;p=29590"},"modified":"2025-12-05T09:15:55","modified_gmt":"2025-12-05T09:15:55","slug":"model-21e-medium-duty-capacitor-switching-contactor","status":"publish","type":"product","link":"https:\/\/swgct.net\/de\/produkt\/model-21e-medium-duty-capacitor-switching-contactor\/","title":{"rendered":"Model 21E \u2013 Medium-Duty Capacitor Switching Contactor"},"content":{"rendered":"<p class=\"ds-markdown-paragraph\"><strong>Introduction<\/strong><br \/>\nIn the realm of automatic power factor correction (APFC), finding the right balance between performance and cost is crucial for system designers. The\u00a0<strong>Model 21E Medium-Duty Capacitor Switching Contactor<\/strong>\u00a0addresses this need by offering\u00a0<strong>optimized capacitor switching capability<\/strong>\u00a0for mainstream industrial and commercial applications. Positioned between basic and premium solutions, the 21E incorporates\u00a0<strong>essential enhancements specifically for capacitor switching duty<\/strong>\u00a0while maintaining an efficient design that delivers excellent value. It provides reliable switching of capacitor banks where standard AC-3 contactors would fail due to excessive inrush currents, making it the intelligent choice for most APFC panel configurations.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Core Design &amp; Performance Features<\/strong><\/p>\n<p class=\"ds-markdown-paragraph\"><strong>1. Engineered for Capacitor Switching Duty<\/strong><br \/>\n<em>Feature:<\/em>\u00a0Specifically rated for\u00a0<strong>AC-6b utilization category<\/strong>\u00a0(switching of capacitor banks). The design incorporates enhanced contact pressure and optimized contact geometry to withstand the unique stresses of capacitor making and breaking operations.<br \/>\n<em>Benefit:<\/em>**\u00a0<strong>Provides reliable performance<\/strong>\u00a0where general-purpose contactors would experience rapid contact degradation, ensuring stable operation throughout the contactor&#8217;s extended service life.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>2. Robust Inrush Current Management<\/strong><br \/>\n<em>Feature:<\/em>\u00a0Built with\u00a0<strong>reinforced contact structure<\/strong>\u00a0and advanced arc control system that can handle capacitor inrush currents of up to\u00a0<strong>100 times the rated current<\/strong>\u00a0during connection. The magnetic system is optimized for quick, positive action to minimize arcing time.<br \/>\n<em>Benefit:<\/em>**\u00a0<strong>Prevents contact welding and erosion<\/strong>, the primary failure mode in standard contactors used for capacitor switching. This ensures consistent performance and reduces maintenance requirements.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>3. Extended Electrical Life Design<\/strong><br \/>\n<em>Feature:<\/em>\u00a0Utilizes\u00a0<strong>silver-based composite contact material<\/strong>\u00a0with superior arc resistance properties. The optimized arc quenching chamber rapidly extinguishes arcs during breaking operations, minimizing contact wear.<br \/>\n<em>Benefit:<\/em>**\u00a0<strong>Delivers significantly longer electrical life<\/strong>\u00a0compared to standard contactors \u2013 typically rated for 100,000+ operations at full rated capacitor load. This translates to reduced replacement costs and improved system uptime.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>4. Thermal Management &amp; Safety<\/strong><br \/>\n<em>Feature:<\/em>\u00a0Incorporates\u00a0<strong>optimized thermal design<\/strong>\u00a0with increased contact mass and efficient heat dissipation paths. Features improved insulation materials and increased clearance distances to handle potential voltage transients.<br \/>\n<em>Benefit:<\/em>**\u00a0<strong>Maintains stable temperature rise<\/strong>\u00a0during continuous operation and provides enhanced safety margin for capacitor switching applications, protecting both the contactor and connected capacitor banks.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>5. User-Friendly Installation &amp; Integration<\/strong><br \/>\n<em>Feature:<\/em>\u00a0Compact design with\u00a0<strong>universal DIN rail mounting<\/strong>\u00a0(35mm). Features front-mounted terminals for easy wiring access and available auxiliary contacts (1NO + 1NC standard) for control circuit signaling to the PFC controller.<br \/>\n<em>Benefit:<\/em>**\u00a0<strong>Simplifies panel assembly and maintenance<\/strong>\u00a0with straightforward installation and clear status indication through auxiliary contacts.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Technical Specifications (Model 21E Representative)<\/strong><\/p>\n<div class=\"ds-scroll-area _1210dd7 c03cafe9\">\n<div class=\"ds-scroll-area__gutters\">\n<div class=\"ds-scroll-area__horizontal-gutter\"><\/div>\n<div class=\"ds-scroll-area__vertical-gutter\"><\/div>\n<\/div>\n<table>\n<thead>\n<tr>\n<th>Parameter<\/th>\n<th>Specification \u2013 Model 21E<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Model Series<\/strong><\/td>\n<td>21E<\/td>\n<\/tr>\n<tr>\n<td><strong>Utilization Category<\/strong><\/td>\n<td>AC-6b (Capacitor Switching)<\/td>\n<\/tr>\n<tr>\n<td><strong>Rated Thermal Current (Ith)<\/strong><\/td>\n<td>40A, 50A, 63A (Depending on specific variant)<\/td>\n<\/tr>\n<tr>\n<td><strong>Rated Capacitor Load<\/strong><\/td>\n<td>15-50 kVar at 400V AC (Specific ratings per variant)<\/td>\n<\/tr>\n<tr>\n<td><strong>Maximum Inrush Withstand<\/strong><\/td>\n<td>Up to 100 x In (Capacitor bank switching)<\/td>\n<\/tr>\n<tr>\n<td><strong>Rated Operational Voltage (Ue)<\/strong><\/td>\n<td>400V \/ 450V \/ 480V AC, 50\/60Hz<\/td>\n<\/tr>\n<tr>\n<td><strong>Control Coil Voltage<\/strong><\/td>\n<td>24V DC, 48V DC, 110V AC, 220V AC, 230V AC<\/td>\n<\/tr>\n<tr>\n<td><strong>Mechanical Life<\/strong><\/td>\n<td>1,500,000 operations minimum<\/td>\n<\/tr>\n<tr>\n<td><strong>Electrical Life (AC-6b)<\/strong><\/td>\n<td>100,000 operations at rated current<\/td>\n<\/tr>\n<tr>\n<td><strong>Mounting<\/strong><\/td>\n<td>DIN Rail (35mm)<\/td>\n<\/tr>\n<tr>\n<td><strong>Terminal Type<\/strong><\/td>\n<td>Screw Clamp (Accepting up to 35mm\u00b2 cable)<\/td>\n<\/tr>\n<tr>\n<td><strong>Auxiliary Contacts<\/strong><\/td>\n<td>1NO + 1NC (Convertible)<\/td>\n<\/tr>\n<tr>\n<td><strong>Ambient Temperature<\/strong><\/td>\n<td>-25\u00b0C to +55\u00b0C (Operating)<\/td>\n<\/tr>\n<tr>\n<td><strong>Standards Compliance<\/strong><\/td>\n<td>IEC 60947-4-1, UL 508, CE, RoHS<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ds-markdown-paragraph\"><strong>Primary Applications<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Industrial APFC Panels:<\/strong>\u00a0For switching individual capacitor steps in 50-200 kVar automatic correction systems in manufacturing facilities<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Commercial Building PFC:<\/strong>\u00a0In shopping malls, office buildings, and hospitals for main distribution panel power factor correction<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Water Treatment Plants:<\/strong>\u00a0For switching capacitor banks on pump and blower motor distribution panels<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>HVAC System Compensation:<\/strong>\u00a0In large central air conditioning systems with significant motor loads<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Renewable Energy Systems:<\/strong>\u00a0For reactive power compensation at commercial solar installations<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><strong>Value Proposition<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Optimal Performance-to-Cost Ratio:<\/strong>\u00a0Delivers specialized capacitor switching performance at a competitive price point, offering excellent value for most industrial applications<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Reduced System Downtime:<\/strong>\u00a0Extended electrical life and reliable inrush handling minimize unscheduled maintenance and contactor replacements<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Enhanced System Protection:<\/strong>\u00a0Proper capacitor switching reduces stress on capacitor banks, extending their service life and protecting your overall PFC investment<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Simplified Compliance:<\/strong>\u00a0Designed to meet international standards for capacitor switching applications, simplifying system approval and certification<\/p>\n<\/li>\n<\/ul>\n<p class=\"ds-markdown-paragraph\"><strong>Selection &amp; Installation Guidelines<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Proper Sizing Essential:<\/strong>\u00a0Select based on the\u00a0<strong>kVar rating of the capacitor step<\/strong>\u00a0at your system voltage, not just the current rating<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Coordination with Protection:<\/strong>\u00a0Must be protected by appropriately rated\u00a0<strong>fast-acting semiconductor fuses<\/strong>\u00a0(typically gG\/gL or aR type) for short-circuit protection<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Control Circuit Considerations:<\/strong>\u00a0Ensure the PFC controller output matches the contactor coil voltage and current requirements<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Thermal Considerations:<\/strong>\u00a0Provide adequate ventilation and spacing in the panel as per manufacturer recommendations<\/p>\n<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p class=\"ds-markdown-paragraph\">The Model 21E is an optimized capacitor switching contactor designed for medium kVar applications in power factor correction systems. It provides the perfect balance between robust performance for handling capacitor inrush currents and cost-effectiveness for commercial and industrial APFC panels. Its enhanced design ensures reliable operation and long service life where standard contactors would fail prematurely.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Key Features:<\/strong><br \/>\n\u2022\u00a0<strong>Optimized Capacitor Switching:<\/strong>\u00a0Specifically designed for AC-6b duty with medium capacitor loads<br \/>\n\u2022\u00a0<strong>Enhanced Inrush Handling:<\/strong>\u00a0Withstands high capacitor inrush currents (up to 100x rated current)<br \/>\n\u2022\u00a0<strong>Long Electrical Life:<\/strong>\u00a0Special contact material ensures 100,000+ operations at rated load<br \/>\n\u2022\u00a0<strong>Compact &amp; Efficient:<\/strong>\u00a0Space-saving design for optimized panel layouts<br \/>\n\u2022\u00a0<strong>Easy Integration:<\/strong>\u00a0DIN rail mounting with standard auxiliary contacts<\/p>","protected":false},"featured_media":29587,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[92,94],"product_tag":[120],"class_list":{"0":"post-29590","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-capacitor","7":"product_cat-split-phase-compensation-capacitor","8":"product_tag-split-phase-compensation-capacitor","10":"first","11":"instock","12":"shipping-taxable","13":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v26.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Model 21E \u2013 Medium-Duty Capacitor Switching Contactor - Swgct<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/swgct.net\/de\/produkt\/model-21e-medium-duty-capacitor-switching-contactor\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Model 21E \u2013 Medium-Duty Capacitor Switching Contactor\" \/>\n<meta property=\"og:description\" content=\"The Model 21E is an optimized capacitor switching contactor designed for medium kVar applications in power factor correction systems. It provides the perfect balance between robust performance for handling capacitor inrush currents and cost-effectiveness for commercial and industrial APFC panels. Its enhanced design ensures reliable operation and long service life where standard contactors would fail prematurely. Key Features: \u2022\u00a0Optimized Capacitor Switching:\u00a0Specifically designed for AC-6b duty with medium capacitor loads \u2022\u00a0Enhanced Inrush Handling:\u00a0Withstands high capacitor inrush currents (up to 100x rated current) \u2022\u00a0Long Electrical Life:\u00a0Special contact material ensures 100,000+ operations at rated load \u2022\u00a0Compact &amp; Efficient:\u00a0Space-saving design for optimized panel layouts \u2022\u00a0Easy Integration:\u00a0DIN rail mounting with standard auxiliary contacts\" \/>\n<meta property=\"og:url\" content=\"https:\/\/swgct.net\/de\/produkt\/model-21e-medium-duty-capacitor-switching-contactor\/\" \/>\n<meta property=\"og:site_name\" content=\"Swgct\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-05T09:15:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/swgct.net\/wp-content\/uploads\/2025\/12\/\u5207\u6362\u7535\u5bb9\u5668\u63a5\u89e6\u56681-scaled.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1707\" \/>\n\t<meta property=\"og:image:height\" content=\"2560\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data1\" content=\"4\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/swgct.net\/product\/model-21e-medium-duty-capacitor-switching-contactor\/\",\"url\":\"https:\/\/swgct.net\/product\/model-21e-medium-duty-capacitor-switching-contactor\/\",\"name\":\"Model 21E \u2013 Medium-Duty Capacitor Switching Contactor - 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