The Siemens Industry Inc. Murray 20/30 Amp Double-Pole Quad Circuit Breaker offers a thermal-magnetic design that is intended for use as overload and short-circuit protection for your home's electrical system. This quad circuit breaker provides 2 sets of common trips, Double-Pole breakers that require 2 panel spaces in a breaker box. Murray does not sell used breakers and has not approved any 3rd party sellers to do so.