this breaker is compatible with QO and Homeline load centers
Miniature circuit breaker 120/240-volt 20-Amp- SCHNEIDER ELECTRIC develops connected technologies and solutions to manage energy and process in ways that are safe
Square D QO™ Standard 2-Pole miniature circuit breaker with Visi-Trip™ indicator
appliances and other equipment
Murray strongly recommends against the use of "used" breakers
2P Shunt Trip Bolt On Circuit Breaker 50A 120/240VAC this breaker is compatible with'Bolt On Circuit Breaker, 50 Amps, Number of Poles 2, Circuit Breaker Type Shunt Trip, AC Voltage Rating 120 240VAC, DC Voltage Rating Not Rated, For Use With Siemens Panelboards, Series B, Terminal Connection Lug, Max. AIR Rating 10 kA, Frame Size BL, Min. Wire Size 8 AWG, Max. Wire Size 6 AWG (Cu), 4 AWG (Al), Length 3. 56 In., Width 2. 00 In., Depth 3. 00 In., Standards UL, HACR Rated'