Typically there are two types:
1. Extended shaft versions e.g Lowara e-HM & Ebara Matrix, where the pump is attached directly to the drive shaft of a pump specific motor.
2. Close coupled versions e.g Lowara e-SV & Grundfos CR where the pump is attached to a standard IEC electric motor via a rigid coupling.
Extended shaft versions are a lower cost option and are more compact. Close coupled versions have the advantage of interchangeable motors which can be replaced without draining the pump or disconnecting the pipe work.