Push/Pull Circuit breakers are single pole, thermal devices. Unit may also be used as a switch. The breaker has a trip free feature which allows the contacts to open on an overload even with the toggle or button held in the ON position. The W23 will carry 100% of rated load continuously but must trip at 135% of rated load at 25° C. within one hour. Amp rating in white on black button. Attaches with 8-32 screws and washers. Approximate size: 11/16 x 1-3/8 x 2-1/8 – 3/8″ hole.