UPSs designed with a paralleling architecture can operate simultaneously and support loads in the following ways.

1. Parallel-Capacity (N ) where the total load demand is met by a number of UPSs paralleled in series without providing redundancy.

2. Parallel-Redundant (N+X). This architecture of parallelism offers high security and protection in very critical applications. UPSs supporting this architecture are connected in parallel and share the total load of the application in such a way that in the event of a failure of one UPS, the others can momentarily support the required load.

Tescom Hellas' Prime Plus is an example of a UPS that supports parallelism.