Prevent electrical feedback between distributor hook circuits during maintenance and service, as required by NEC 514-3, 2002 and other international specifications.

Factory wiring can be provided with intelligent controller or standard control box.

Eliminate false STP running due to voltage leakage from multiple parallel distributors.

The fuse to the submersible pump controller protects the output.

STP-DHI/STP-DHIB can be retrofitted to any existing site.