Siemens 5SL7404-3RC, Miniature Circuit Breaker, 4A, 4-pole, K characteristic, 15kA breaking capacity.
The K trip curve means it's designed for motor and transformer loads where inrush currents are higher than resistive loads — it holds through the start-up spike and trips on sustained overloads.
The K characteristic is the one to spec when the load is a small motor or a transformer bank; a C-curve would nuisance-trip on the same inrush, and a D-curve would let a sustained overload run too long. For a 4A motor branch circuit, this is the right curve.
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The K trip curve is designed for motor and transformer loads — it holds through the inrush spike (typically 8-12x rated current) and trips on sustained overloads, unlike a C curve which would nuisance-trip on the same start-up current.
The 5SL7404-3RC has a 15kA breaking capacity, meaning it can safely interrupt fault currents up to 15,000 amps without damage or upstream coordination issues.
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