本规范涵盖了额定电流为0.2安培至100安培（含0.2安培）的单极和多极、免跳闸、非密封磁性断路器的要求和试验程序，以及240伏、400赫兹、480伏、60赫兹交流电（ac）和125伏直流电（dc）的要求和试验程序（见6.1）。这些断路器还可能包括用于监控电路的辅助触点（见6.6.1）。四极设备中也有电压敏感极。面板密封支架的电流范围为0.2安培到50安培。设计师被警告，这些断路器可能在某些部件上含有纯锡涂层（见6）。 5).

This specification covers the requirements and test procedures for single and multipole, trip-free, unsealed, magnetic circuit breakers with current ratings of 0.2 amperes to 100 amperes inclusive, up to and including 240 volts, 400 Hertz, 480 volts, 60 Hertz alternating current (ac) and 125 volts direct current (dc), (see 6.1). These circuit breakers may also include auxiliary contacts (see 6.6.1) for monitoring circuits. A voltage sensitive pole is also available in a four pole device. Panel seal mounts are available in 0.2 amperes through 50 amperes. Designers are WARNED that these circuit breakers may contain a pure tin finish on some of the component parts (see 6.5).