JB/T 51155-1999

Manufacturers and quality inspection agencies of magneto breakers use this standard to assess product quality grades. They apply the grading indicators, test methods, and inspection rules to classify products as qualified, first-class, or superior. This standard ensures consistent product quality and provides a unified basis for quality supervision and spot checks.

磁电机用断电器制造商和质检机构使用本标准来评定产品质量等级。他们依据本标准中的分等指标、试验方法和检验规则，对产品进行合格品、一等品和优等品的分级。该标准确保了断电器产品的质量一致性，为质量监督和抽查提供了统一依据。

This standard JB/T 51155-1999 specifies the quality grading indicators, test methods, and inspection rules for magneto breakers, applicable to product quality grading, spot checks, and supervision inspection. It classifies products into three grades: qualified, first-class, and superior, referencing JB/T 9864.1 and JB/T 9864.2 for technical conditions and test methods. Key technical items include appearance, mounting dimensions, contact coaxiality, spring tension, insulation resistance, dielectric strength, continuous firing, vibration, temperature shock, contact resistance, surface roughness, weld strength, and durability (16 items total). Compared to the previous version, the impact test and three appendices were removed, and a sweep-frequency vibration test was added.

本标准JB/T 51155-1999规定了磁电机用断电器产品质量分等的指标、试验方法和检验规则，适用于产品质量分级、抽查和监督检验。标准将产品分为合格品、一等品和优等品三个等级，引用JB/T 9864.1和JB/T 9864.2作为技术条件和试验方法依据。主要技术内容包括外观、安装尺寸、触点同轴度、弹簧张力、绝缘电阻、介电强度、连续发火、振动、温度冲击、接触电阻、粗糙度、焊缝强度和耐久性等16项分等项目。与旧版相比，取消了冲击试验和三个附录，增加了扫频振动试验。