Termitrab TT are terminal blocks with multilevel surge protection. The narrow design (6,2 mm wide) makes this product especially useful for projects where several signal interfaces for automation technology must be secured in a small space. This enables the creation of a space-saving and surge-protected connection level in the control cabinet.
The three-level protective circuits consist of quick-responding and low-limiting suppressor diodes, supported by varistors for average protection levels and powerful gas-filled over voltage suppressors for high-voltage protection. The protection levels are isolated from one another using ohmic resistors. This provides optimum power distribution in the protective circuit for limiting surge voltages and leading off surge currents. An electrical conductive connection is automatically established between the earth reference point for the protective circuit and the DIN rail when a protective terminal is snapped on. Only the DIN rail must be grounded for the ground connection of complete terminal connection.
Three versions are available:
* TT-2PE - protects a double wire isolated from ground potential, eg 0-20 mA or 0-10 V signals.
* TT-EX(I) - 24 d.c. protects a double wire isolated from ground potential in Ex ia circuits.
* TT-2/2 - protects two signal wires with the same reference potential, eg binary signals from position indicators.
Reference potentials isolated from ground potential can also be placed on the DIN rail provided the rail is designed for isolation from ground. If this is the case, an additional protective device with integrated gas-filled over voltage suppressors for longitudinal high-voltage protection must be connected from the DIN rail-to-ground.
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