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Why on occasion will HOM Circuit Breakers trip when turning on HPS (High Pressure Sodium) lights?

Why do HPS lights trip low amperage HOM breakers?

Product Line:
Miniature Circuit Breakers

Each HPS fixture has a transformer to generate the high voltage needed to keep an arc going inside the bulb. This transformer draws a huge amount of inrush current when energized. The current can be 10 to 20 times the operating current. This inrush can cause the "Quick Open" feature of the QO 15 and 20 amp breakers to trip instantaneously. When all conditions are right, the breaker is seeing the inrush as a short circuit and tripping immediately.
The solution is to replace the HOM115 or the HOM120 breakers with HOM115HM or HOM120HM high magnetic breakers. These are designed just for this application - high inrush lighting circuits.
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