Description
ISA STCS PLUS Switch Module Repair
The ISA STCS PLUS is a switching/connection accessory used with ISA transformer test systems — it routes the test set’s source and measurement connections across a transformer’s terminals to automate multi-tap turns-ratio and related measurements. As a switching module, its faults concentrate in the relays/matrix, the channel routing, and the control interface to the host test set.
June Company repairs and calibrates the ISA STCS PLUS for transformer-test and utility teams.
Common ISA STCS PLUS problems we fix
- Channel / relay faults — a switching channel not routing the source/measurement correctly, the relays repaired so every channel connects.
- Turns-ratio / measurement-path errors — a routing fault skewing the host’s ratio readings, corrected and verified.
- Control-interface faults — won’t sequence or communicate with the test set, restored.
- Intermittent channel — relay-contact wear, repaired.
- Connection or power faults.
FAQs
One of my STCS channels won’t connect — fixable? Yes. Relay and routing faults are repairable, then every channel is verified with the host test set so multi-tap measurements are reliable, with documented results.
Do you test it with the test set? Yes — the module is verified as part of the working system.
Every repair includes calibration verification and a 90-day parts-and-labor warranty. Email us or submit a service request.






