The industry leader in circuit protection is easily recognized by the industry's only trip indicator-the red Visi-Trip® Indicator makes it easy to spot a tripped circuit breaker. Compact 3/4 in W format for 1-pole circuit breakers helps minimize panel space and footprint. The Square D™ exclusive QO™ protection is standard on all 15 A and 20 A circuit breakers trip reaction within 1/60 the of a second. No other circuit breaker trips faster.