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What does the green handle on the QO breaker indicate? What does the gray handle indicate?

What do green or gray handles indicate on QO breakers?

Product Line:
Miniature Circuit Breakers

The green handle indicated that the breaker has a 10 kA at 120/240 V AIC rating at a time when the standard black handle was rated for 5 kA. The gray handle indicates that the breaker has a 65 kA AIC rating. Now all handles are black, regardless of AIC rating.
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