Product details:

Siemens value pack load centers are provided with a combination flush/surface mount cover, a main breaker, aluminum bus bars, and Insta-Wire neutrals. Included in the value packs are three Q120 breakers and one Q230 breaker. The Q120 breaker is a single pole, 20A breaker. The Q230 is a double pole 30A breaker. Ground bars are not included in this device and must be purchased separately if needed. If a ground bar is needed use one of the EC2GB series ground bars.