A terminal block assembly includes a housing, a housing retention member coupled to the housing, a plurality of screw lug terminal assemblies disposed within the housing and a plurality of push-in terminal assemblies disposed within the housing. A push-in terminal of the plurality of push-in terminal assemblies includes a strain relief member and a retention spring assembly. The retention spring assembly includes a finger member and a conductor member. The conductor member electrically couples the finger member to a corresponding screw-lug terminal assembly. A bottom portion of the strain relief member engages the conductor member of the retention spring assembly to retain the retention spring assembly within the housing. A ground strap is disposed within the housing.