The DAS.4/D type of multiple level terminal block is equipped with a suppressor diode connected between the upper and lower levels and can be used to restrict voltage peaks due to surges, static discharge or inductive load switching. The suppresser diode has a response time of <1ns, which is much lower than that of varistors (typically 25ns) and a lower, more accurate, response voltage. However, compared to varistors they withstand lower discharge currents. The high precision of the trip voltage and the high speed makes them suitable for protecting I/O signal inputs of PLC's, DCS systems and PC's against discharge current and voltage interference below 500A pulse 8/20ms. ASI offers a range of multiple level terminal blocks equipped with suppressor diodes from 5 volts DC to 60 volts DC.
The DAS.4/D can be wired into a circuit to provide effective protection against either differential mode (diagram 4,5) or common mode (diagram 6) interference for inputs and outputs of industrial PLC's, DCS systems and PC's, signal conditioners and sensors and also for power supply units of electronic equipment in general.
In addition to the above mentioned suppressor diode models of terminal blocks ASI offers a wide range of multiple level terminal blocks equipped with varistors to protect against higher discharge currents.
Multiple level terminal blocks are also available which allow the customer to add their own components, or for ASI to add components selected by the customer. There are also blocks and housings which can be used to add a small printed circuit board, which may be designed with a more complete circuit. These same products are also available with both electro-mechanical and solid state relays. Check the factory for specific details 877-650-5160.
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View Associated Products Below to Complete Your Project
Catalog No. / Description
Screw Clamp Connection 2-Level DIN Rail Mounted Terminal Block With Electronic Component
Additional Accessories shown on the Datasheet
2-level terminal block with bi-directional suppressor diode between upper and lower level.
Rated at 5 volts, with a max clamping voltage of 11 volts and response time <1ns
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