Product details:

has a bolt-on connection type and includes long time and instantaneous trip functions.Twin single pole, 20/20Amp Bolt on 120-Volt type QT interchangeable circuit breaker
10,000 AIC interrupting rating
Siemens type QT circuit breakers provide easy plug-in connections in Siemens enclosures and the time saving insta-wire feature
Compatible with Siemens PL and ES series load centers
Use for overload and short-circuit protection of your electrical system
Thermal-magnetic