• Finger-safe – There are no exposed metallic parts on the FTS test block or on the FTP test plug, greatly increasing safety during testing. Even the back-side is finger safe.

• Patented Keyed Test Plugs – Test plugs are keyed to the corresponding test block, preventing mistakes and errors during test.

• Built-in Time Sequencing – When a FTP test plug is inserted into a FTS test block, contacts are opened in a pre-defined sequence. This is done to prevent false trips from activating the breaker, greatly simplifying the task of testing. The intelligence is built into the plug: different length fingers create the sequence and fixed current shorting bars provide safe and reliable make-before-break current shorting. When the FTP test plug is removed from the block, contacts are closed in the reverse order, with the trips contacts being the last to close. 

• Less than 2 mΩ internal resistance – Thanks to the patented construction, FTS / FTP test interfaces have an extremely low internal resistance. This ensures a lighter load on instrumentation transformers and no impact on heat generation within panels.

• Over 100 Models and Counting – Models are available in any even number within the range of 8 to 20-pole configurations. Any combination of currents, voltages or trip signals. Custom labeling. The right FTS test block either already exists or can easily be created.

• Compatible Test Plugs – FTP and LTP Test Plugs.

Closed circuit

A FTS test block contains 8, 10, 12, 14, 16, 18 or 20 modular units (or poles) each allocated to a current, voltage, signal or trip circuit. Each circuit is connected through the block via two silver-plated copper contacts, pressed securely together by two pressure springs to create a highly conductive electrical connection. In this situation, an electrical connection is established between the device side (B) and the system side (A).

Open Circuit

When testing, the corresponding FTP test plug is inserted into the test block. In this position, the device and system sides of the test block are isolated from each other. The test plug includes internal shorting bridges for the current circuits. When the test plug is removed from the test block, the internal springs force the contacts back together, returning the circuits to its normally-closed position.

Signal Injection

Banana jacks in the test plug allow the connection of a test set to the device side of the test block and the associated signal injection. Access to the system side is also provided.

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