1 This Guideline applies to shipborne low-voltage air circuit-breakers operated at AC 50 Hz (or 60 Hz) for rated voltages up to 1 kV (herein after called as “circuit-breakers”).
2 This Guideline is applicable to frame circuit-breakers and molded case circuit-breakers.
3 DC circuit-breakers may be referred to in this Guideline and related standards.
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