Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: EN 50557:2011
• Năm ban hành / Publication date: 2011
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Requirements for automatic reclosing devices (ARDs) for circuit breakers-RCBOs-RCCBs for household and similar uses
• Phạm vi áp dụng / Scope of standard: This European Standard applies to Automatic Reclosing Devices (hereinafter referred to as “ARD”) for household and similar uses, for rated voltage not exceeding 440 V a.c. intended to be used in combination with circuit-breakers and/or RCCBs and/or RCBOs, and designed either for factory assembly or for assembly on site. These devices are intended to reclose main protective devices (hereinafter referred to as “MPD”) such as circuit-breakers complying to EN 60898-1 and/or EN 60898-2, RCCBs complying to EN 61008-1 and RCBOs complying to EN 61009-1 after tripping of those devices in order to re-establish continuity of service. In detail, this European Standard applies to the following types of ARD: - ARD with assessment means, reclosing only if both the prospective line current and the prospective earth-fault current do not exceed given values; - ARD with assessment means, reclosing only if the prospective line current does not exceed a given value; - ARD with assessment means, reclosing only if the prospective earth-fault current does not exceed a given value; - ARD that reclose without any assessment.