{"product_id":"wced-type-b-rcd","title":"WCED Type B RCD | 2 \u0026 4 Pole, 25–63A, 30mA | EcoHarmony","description":"\u003c!-- ============================================================\n     PRODUCT PAGE: WCED Type B RCD\n     URL handle: wced-type-b-rcd\n     Meta title: WCED Type B RCD | 2 \u0026 4 Pole, 25–63A, 30mA | EcoHarmony\n     Meta description: WCED Type B RCDs for EV charger, heat pump and inverter installations. 2-pole and 4-pole, 25A to 63A, 30mA. IEC\/EN 62423 compliant. DIN rail mount. UK stock.\n\n     SHOPIFY VARIANTS TO CREATE:\n     Variant 1:  2 Pole 25A  — SKU: WEV225B-030 — Price: £95.00 ex VAT\n     Variant 2:  2 Pole 40A  — SKU: WEV240B-030 — Price: £95.00 ex VAT\n     Variant 3:  2 Pole 63A  — SKU: WEV263B-030 — Price: £95.00 ex VAT\n     Variant 4:  4 Pole 25A  — SKU: WEV425B-030 — Price: £119.00 ex VAT\n     Variant 5:  4 Pole 40A  — SKU: WEV440B-030 — Price: £119.00 ex VAT\n     Variant 6:  4 Pole 63A  — SKU: WEV463B-030 — Price: £119.00 ex VAT\n     ============================================================ --\u003e\n\n\u003cstyle\u003e\n  .eh-product{font-family:sans-serif;color:#1a1a1a;line-height:1.7;max-width:860px;font-size:16px;}\n  .eh-product h2{font-size:20px;font-weight:600;margin:28px 0 8px;border-bottom:2px solid #1D9E75;padding-bottom:5px;color:#085041;}\n  .eh-product h3{font-size:17px;font-weight:600;margin:20px 0 5px;color:#1a1a1a;}\n  .eh-product p{margin:8px 0;font-size:16px;}\n  .eh-product ul{margin:6px 0 14px 22px;}\n  .eh-product li{margin:5px 0;font-size:16px;}\n  .eh-callout{background:#E1F5EE;border-left:4px solid #1D9E75;padding:14px 18px;border-radius:4px;margin:16px 0;font-size:16px;}\n  .eh-callout strong{color:#085041;}\n  .eh-warn{background:#FAEEDA;border-left:4px solid #BA7517;padding:14px 18px;border-radius:4px;margin:16px 0;font-size:16px;}\n  .eh-specs{width:100%;border-collapse:collapse;margin:14px 0;}\n  .eh-specs th{background:#085041;color:#fff;padding:8px 12px;text-align:left;font-size:15px;}\n  .eh-specs td{padding:8px 12px;border-bottom:1px solid #e0e0e0;font-size:15px;}\n  .eh-specs tr:nth-child(even) td{background:#f5f5f5;}\n  .eh-compare{width:100%;border-collapse:collapse;margin:14px 0;}\n  .eh-compare th{background:#085041;color:#fff;padding:8px 12px;text-align:left;font-size:15px;}\n  .eh-compare td{padding:8px 12px;border-bottom:1px solid #e0e0e0;font-size:15px;}\n  .eh-compare tr:nth-child(even) td{background:#f5f5f5;}\n  .eh-faq{margin:16px 0;}\n  .eh-faq details{border:1px solid #e0e0e0;border-radius:6px;margin:8px 0;}\n  .eh-faq summary{padding:12px 16px;font-weight:600;cursor:pointer;font-size:16px;color:#085041;}\n  .eh-faq details[open] summary{border-bottom:1px solid #e0e0e0;}\n  .eh-faq .faq-body{padding:12px 16px;font-size:16px;line-height:1.7;}\n  .eh-links{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0;}\n  .eh-links a{background:#085041;color:#fff;padding:7px 14px;border-radius:4px;text-decoration:none;font-size:15px;}\n  .eh-links a:hover{background:#1D9E75;}\n  .eh-badge{display:inline-block;background:#E1F5EE;color:#085041;padding:4px 11px;border-radius:20px;font-size:13px;font-weight:600;margin:2px;}\n\u003c\/style\u003e\n\n\u003cdiv class=\"eh-product\"\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eWCED Type B RCD\u003c\/strong\u003e provides residual current protection against AC, pulsating DC, and smooth DC fault currents — making it the correct choice for EV charger installations, heat pump circuits, inverter-driven loads, UPS systems, and frequency converters where standard Type A or Type AC devices may not provide sufficient protection.\u003c\/p\u003e\n\n  \u003cp\u003eAvailable in 2-pole (single-phase) and 4-pole (three-phase) configurations, with current ratings of 25A, 40A, and 63A. All variants are 30mA sensitivity and DIN rail mountable.\u003c\/p\u003e\n\n  \u003cdiv class=\"eh-callout\"\u003e\n    \u003cstrong\u003eCorrect protection for modern EV charger installations.\u003c\/strong\u003e Where an EV charger or associated equipment can produce smooth DC residual currents, a Type B RCD is required under IEC\/EN 62423. Type A devices detect pulsating DC only and may not provide adequate protection in these scenarios. Your installer will confirm which type applies to your installation.\n  \u003c\/div\u003e\n\n  \u003ch2\u003eWhich variant do you need?\u003c\/h2\u003e\n\n  \u003ctable class=\"eh-compare\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eVariant\u003c\/th\u003e\n\u003cth\u003ePoles\u003c\/th\u003e\n\u003cth\u003eSupply\u003c\/th\u003e\n\u003cth\u003eTypical use\u003c\/th\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2 Pole 25A\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eSingle phase\u003c\/td\u003e\n\u003ctd\u003eSmaller single-phase EV charger or heat pump circuits\u003c\/td\u003e\n\u003ctd\u003eWEV225B-030\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2 Pole 40A\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eSingle phase\u003c\/td\u003e\n\u003ctd\u003eStandard 7kW single-phase EV charger installations\u003c\/td\u003e\n\u003ctd\u003eWEV240B-030\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2 Pole 63A\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eSingle phase\u003c\/td\u003e\n\u003ctd\u003eHigher-load single-phase circuits, submain protection\u003c\/td\u003e\n\u003ctd\u003eWEV263B-030\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e4 Pole 25A\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003eThree phase\u003c\/td\u003e\n\u003ctd\u003eSmaller three-phase inverter or converter circuits\u003c\/td\u003e\n\u003ctd\u003eWEV425B-030\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e4 Pole 40A\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003eThree phase\u003c\/td\u003e\n\u003ctd\u003eThree-phase EV chargers, solar inverters, UPS\u003c\/td\u003e\n\u003ctd\u003eWEV440B-030\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e4 Pole 63A\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003eThree phase\u003c\/td\u003e\n\u003ctd\u003eHigher-load three-phase commercial EV installations\u003c\/td\u003e\n\u003ctd\u003eWEV463B-030\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003cdiv class=\"eh-warn\"\u003e\n    \u003cstrong\u003e2-pole vs 4-pole.\u003c\/strong\u003e Use the 2-pole variant for single-phase (230V) installations. Use the 4-pole variant for three-phase (400V) installations where all three phases plus neutral require monitoring. If you are unsure which applies, consult your installer or contact us.\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\n  \u003ctable class=\"eh-specs\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003e2 Pole variants\u003c\/th\u003e\n\u003cth\u003e4 Pole variants\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePoles\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCurrent ratings available\u003c\/td\u003e\n\u003ctd\u003e25A, 40A, 63A\u003c\/td\u003e\n\u003ctd\u003e25A, 40A, 63A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTripping sensitivity\u003c\/td\u003e\n\u003ctd\u003e30mA\u003c\/td\u003e\n\u003ctd\u003e30mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRCD type\u003c\/td\u003e\n\u003ctd\u003eType B\u003c\/td\u003e\n\u003ctd\u003eType B\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFault current detection\u003c\/td\u003e\n\u003ctd\u003eAC, pulsating DC, smooth DC\u003c\/td\u003e\n\u003ctd\u003eAC, pulsating DC, smooth DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAC frequency range\u003c\/td\u003e\n\u003ctd\u003eUp to 1000Hz\u003c\/td\u003e\n\u003ctd\u003eUp to 1000Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRated voltage\u003c\/td\u003e\n\u003ctd\u003e230V\u003c\/td\u003e\n\u003ctd\u003e400V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e35mm DIN rail\u003c\/td\u003e\n\u003ctd\u003e35mm DIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eIEC\/EN 62423\u003c\/td\u003e\n\u003ctd\u003eIEC\/EN 62423\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWCED\u003c\/td\u003e\n\u003ctd\u003eWCED\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eTypical applications\u003c\/h2\u003e\n\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEV charger installations\u003c\/strong\u003e — where the charger specification or inverter design requires Type B protection\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHeat pump circuits\u003c\/strong\u003e — variable frequency drives can produce smooth DC leakage requiring Type B detection\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSolar PV inverters\u003c\/strong\u003e — particularly transformerless inverters that can produce DC residual currents\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUPS systems\u003c\/strong\u003e — uninterruptible power supplies with DC bus circuits\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFrequency converters\u003c\/strong\u003e — industrial and commercial variable speed drives\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBuilding site power cabins\u003c\/strong\u003e — where mixed load types require comprehensive residual current protection\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eType A vs Type B — what is the difference?\u003c\/h2\u003e\n\n  \u003cp\u003eType A RCDs detect AC and pulsating DC residual currents. Type B RCDs detect all of the above \u003cem\u003eplus\u003c\/em\u003e smooth DC residual currents and AC currents at frequencies up to 1000Hz. For many modern EV chargers and inverter-driven loads, the equipment's internal power electronics can produce smooth DC leakage that a Type A device will not detect — making Type B the technically correct choice.\u003c\/p\u003e\n\n  \u003cp\u003eNot every EV charger installation requires Type B protection. The charger manufacturer's documentation will specify the required RCD type. If the documentation specifies Type A or Type AC, a Type A device is sufficient. If it specifies Type B, or if the charger contains a PFC stage or rectifier, Type B should be used.\u003c\/p\u003e\n\n  \u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n  \u003cdiv class=\"eh-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes every EV charger need a Type B RCD?\u003c\/summary\u003e\n      \u003cdiv class=\"faq-body\"\u003eNo — it depends on the charger. Some EV chargers include internal DC fault protection (often called RDC-DD) which means a standard Type A RCD is sufficient upstream. Others, particularly those without internal DC protection or with specific inverter stages, require Type B. Always check the charger manufacturer's installation documentation and your installer will confirm the correct device. If in doubt, Type B provides a higher level of protection and is always acceptable where Type A is required.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat does 30mA tripping sensitivity mean?\u003c\/summary\u003e\n      \u003cdiv class=\"faq-body\"\u003e30mA is the standard tripping threshold for personal protection — it will disconnect the circuit when residual current reaches 30 milliamps, which is below the threshold likely to cause a lethal electric shock in most circumstances. This is the standard sensitivity required for EV charger and domestic circuits under BS 7671.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use a Type B RCD where a Type A is specified?\u003c\/summary\u003e\n      \u003cdiv class=\"faq-body\"\u003eYes. Type B provides a superset of the protection offered by Type A — it detects everything Type A detects, plus smooth DC currents. Using a Type B where Type A is specified is always technically acceptable, though it comes at a higher cost. Where the charger documentation specifies Type A, either type is compliant.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes this RCD include overcurrent protection?\u003c\/summary\u003e\n      \u003cdiv class=\"faq-body\"\u003eNo. This is a standalone RCD (RCCB) providing residual current protection only. It does not include overcurrent or short-circuit protection. A separate MCB or RCBO is required for overcurrent protection, or the circuit must be protected upstream by an appropriately rated MCB. See our \u003ca href=\"\/collections\/wced-products\"\u003efull WCED range\u003c\/a\u003e for compatible overcurrent protection devices and pre-fitted consumer units.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this suitable for use in a pre-fitted consumer unit?\u003c\/summary\u003e\n      \u003cdiv class=\"faq-body\"\u003eThis is a standalone DIN rail module, not a pre-fitted unit. If you need a complete ready-to-connect solution with RCD, MCB or RCBO, and surge protection already assembled, see our \u003ca href=\"\/pages\/ev-charger-consumer-unit\"\u003epre-fitted EV charger consumer units\u003c\/a\u003e.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 2-pole and 4-pole versions?\u003c\/summary\u003e\n      \u003cdiv class=\"faq-body\"\u003eThe 2-pole variant is for single-phase (230V) installations — it monitors the live and neutral conductors. The 4-pole variant is for three-phase (400V) installations — it monitors all three phase conductors plus neutral. Use 2-pole for standard domestic EV chargers and single-phase heat pumps. Use 4-pole for three-phase EV chargers (11–22kW), three-phase heat pumps, and commercial installations.\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003ch2\u003eRelated products\u003c\/h2\u003e\n  \u003cdiv class=\"eh-links\"\u003e\n    \u003ca href=\"\/products\/pen-fault-detection-with-surge-protection\"\u003eSingle Phase PME Unit (IP65)\u003c\/a\u003e\n    \u003ca href=\"\/products\/3-phase-pme-40a-rcbo-surge-protection\"\u003e3-Phase PME Unit\u003c\/a\u003e\n    \u003ca href=\"\/pages\/ev-charger-consumer-unit\"\u003ePre-Fitted Consumer Units\u003c\/a\u003e\n    \u003ca href=\"\/collections\/wced-products\"\u003eAll WCED Products\u003c\/a\u003e\n    \u003ca href=\"\/pages\/product-finder\"\u003eProduct Finder\u003c\/a\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin-top:16px;\"\u003e\n    \u003cspan class=\"eh-badge\"\u003eType B RCD\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003e2 \u0026amp; 4 Pole\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003e25A \/ 40A \/ 63A\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003e30mA\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003eDIN Rail\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003eIEC\/EN 62423\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003eEV Charger\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003eHeat Pump\u003c\/span\u003e\n    \u003cspan class=\"eh-badge\"\u003eUK Stock\u003c\/span\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does every EV charger need a Type B RCD?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No — it depends on the charger. Some EV chargers include internal DC fault protection (RDC-DD) which means a standard Type A RCD is sufficient. Others require Type B. Always check the charger manufacturer's installation documentation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between a Type A and Type B RCD?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Type A RCDs detect AC and pulsating DC residual currents. Type B RCDs detect all of the above plus smooth DC residual currents and AC currents up to 1000Hz. Type B provides a higher level of protection and is required where equipment can produce smooth DC leakage, such as some EV chargers, solar inverters and variable frequency drives.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 2-pole and 4-pole Type B RCD?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 2-pole variant is for single-phase 230V installations and monitors live and neutral conductors. The 4-pole variant is for three-phase 400V installations and monitors all three phase conductors plus neutral.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the WCED Type B RCD include overcurrent protection?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. This is a standalone RCD providing residual current protection only. A separate MCB or RCBO is required for overcurrent protection.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"WCED","offers":[{"title":"2 \/ 25A","offer_id":58156928074115,"sku":"WEV225B-030","price":95.0,"currency_code":"GBP","in_stock":true},{"title":"2 \/ 40A","offer_id":58156928106883,"sku":"WEV240B-030","price":95.0,"currency_code":"GBP","in_stock":true},{"title":"2 \/ 63A","offer_id":58156928139651,"sku":"WEV263B-030","price":95.0,"currency_code":"GBP","in_stock":true},{"title":"4 \/ 25A","offer_id":58156928172419,"sku":"WEV425B-030","price":119.0,"currency_code":"GBP","in_stock":true},{"title":"4 \/ 40A","offer_id":58156928205187,"sku":"WEV440B-030","price":119.0,"currency_code":"GBP","in_stock":true},{"title":"4 \/ 63A","offer_id":58156928237955,"sku":"WEV463B-030","price":119.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1033\/7545\/files\/WEV240B-030_600x695_1254e478-c24a-45c9-b2cd-65724595c275.webp?v=1780145706","url":"https:\/\/ecoharmony.co.uk\/products\/wced-type-b-rcd","provider":"EcoHarmony","version":"1.0","type":"link"}