{"title":"Circuit Protection","description":"\u003cp\u003eNOARK circuit protection for domestic, commercial and industrial installations — MCBs, RCBOs, RCCBs and isolators. All devices are CE marked, manufactured to IEC\/EN standards and backed by a \u003cstrong\u003e5-year warranty\u003c\/strong\u003e. Supplied by Shamrock Electrical Supplies, electrical wholesaler, Rathcoole, Dublin.\u003c\/p\u003e\n\n\u003cp\u003eIncludes \u003cstrong\u003eType B RCCBs\u003c\/strong\u003e (Ex9LB63) suitable for EV charge points and PV solar inverters, where sensitivity to smooth DC residual current is required — a capability Type AC and Type A devices do not provide.\u003c\/p\u003e\n\n\u003ch2\u003eWhich device do you need?\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eDevice\u003c\/th\u003e\n\u003cth\u003eProtects against\u003c\/th\u003e\n\u003cth\u003eTypical use\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eMCB\u003c\/strong\u003e — Ex9B125\u003c\/td\u003e\n\u003ctd\u003eOverload and short circuit\u003c\/td\u003e\n\u003ctd\u003eFinal circuit protection. Curve B for resistive loads, C for motors and lighting banks, D for high inrush. 16–100 A, up to 25 kA.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eRCBO\u003c\/strong\u003e — Ex9BL-H\u003c\/td\u003e\n\u003ctd\u003eEarth fault + overload and short circuit\u003c\/td\u003e\n\u003ctd\u003ePer-circuit protection in one 2-module device. 6–40 A, 30\/100\/300 mA, Type AC or Type A.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eRCCB\u003c\/strong\u003e — Ex9LB63 (Type B)\u003c\/td\u003e\n\u003ctd\u003eEarth fault, including smooth DC\u003c\/td\u003e\n\u003ctd\u003eEV charge points, PV inverters, variable speed drives. 25\/40\/63 A, 30\/100\/300 mA, 2 and 4-pole.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cstrong\u003eIsolator\u003c\/strong\u003e — Ex9I125\u003c\/td\u003e\n\u003ctd\u003eIsolation (not a protective device)\u003c\/td\u003e\n\u003ctd\u003eMain switch, lockable in the OFF position. 16–125 A, 1 to 4-pole.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eNot sure which RCD type your job needs? Read our guide: \u003ca href=\"\/pages\/rcd-types-explained\"\u003e\u003cstrong\u003eRCD Types Explained — Type AC vs Type A vs Type B\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eCommon questions\u003c\/h2\u003e\n\n\u003ch3\u003eDo I need a Type B RCD for an EV charger?\u003c\/h3\u003e\n\u003cp\u003eYou need protection against smooth DC fault current. That means either a Type B RCD upstream, or a Type A RCD where the charge point itself includes a 6 mA DC fault detection device (RDC-DD) to IEC 62955. Check the charger manufacturer's installation instructions to determine which applies.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the difference between an RCCB and an RCBO?\u003c\/h3\u003e\n\u003cp\u003eAn RCCB provides residual current (earth fault) protection only and must be paired with an MCB or fuse for overload protection. An RCBO combines both functions in a single device, so each circuit gets its own residual current and overload protection.\u003c\/p\u003e\n\n\u003ch3\u003eWhat is the difference between a Type A and a Type B RCD?\u003c\/h3\u003e\n\u003cp\u003eA Type A detects AC and pulsating DC residual current. A Type B detects those plus smooth DC residual current and high frequencies up to 1 kHz. Only a Type B is suitable where smooth DC fault current can occur, such as with transformerless PV inverters.\u003c\/p\u003e\n\n\u003ch3\u003eWhich MCB curve should I use?\u003c\/h3\u003e\n\u003cp\u003eCurve B (3–5 × rated current) for resistive loads and general domestic circuits. Curve C (5–10 ×) for motors, transformers and lighting banks — the most common choice in commercial work. Curve D (10–20 ×) for high-inrush loads such as welding equipment and direct-on-line motor starting.\u003c\/p\u003e\n\n\u003ch3\u003eAre NOARK devices certified for use in Ireland?\u003c\/h3\u003e\n\u003cp\u003eYes. All NOARK circuit protection supplied by Shamrock Electrical is CE marked and manufactured to the relevant IEC\/EN standards — EN 60947-2 for MCBs, EN 61009 for RCBOs, IEC\/EN 61008-1 and 62423 for RCCBs, and IEC\/EN 60947-3 for isolators. Installations must comply with I.S. 10101, the National Rules for Electrical Installations.\u003c\/p\u003e\n\n\u003ch3\u003eCan you supply a complete populated board instead of individual devices?\u003c\/h3\u003e\n\u003cp\u003eYes. We build \u003ca href=\"\/pages\/equipped-distribution-boards\"\u003eEquipped Distribution Boards\u003c\/a\u003e — fully populated consumer units assembled to your circuit schedule, including Type B protection for EV and PV work. Quoted to your specification.\u003c\/p\u003e\n\n\u003cp\u003eTrade enquiries: \u003ca href=\"mailto:sales@shamrockelectrical.ie\"\u003esales@shamrockelectrical.ie\u003c\/a\u003e or (01) 401 9907.\u003c\/p\u003e","products":[],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0290\/3461\/0762\/collections\/noark-circuit-protection-group.png?v=1785853340","url":"https:\/\/www.shamrockelectrical.ie\/collections\/circuit-protection.oembed","provider":"Shamrock Electrical Supplies ","version":"1.0","type":"link"}