B1H Series Miniature Circuit Breakers - UL 489, 480Y/277Vac, 0.5A to 32A On NOARK Electric North America
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Siemens 5SJ41107HG40 Miniature Circuit Breaker, UL 489 Rated, 1 Pole Breaker, 10 Ampere Maximum, Tripping Characteristic C, DIN Rail Mounted, Type HSJ, 240 VAC, 60 VDC : Amazon.co.uk: DIY & Tools
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Definitions from the Standard UL 489 (MCCB)
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