Braeburn 500 series mechanical thermostats are the perfect mercury-free alternative to mercury-bulb thermostats. Our megaswitch magnetic switch technology provides dependable switch performance, giving customers the durability and reliability needed to replace common mercury-bulb thermostats on every job! our mechanical thermostats are manufactured with plated terminals to prevent corrosion. Front mounted wiring terminals, an integrated sub-base and no required leveling make them easy to install.