491B 493B Selection
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491B v 493B Master Lock Breaker Lockout Selection

If you’re unsure which of these circuit breaker lockouts to choose (491B and 493B), this image shows you the maximum size of circuit breaker switch toggle which can be accommodated in each.

The width, height and depth of the switch toggle are the determining factors for these two circuit breakers. A quick check against this image will help you choose the right one for your circuit breaker lockout.