Black Box SP522A-R2 Eight-Wire Token Ring and RS-232 Surge Protector

Black Box Black Box

New

  • Keep your network and communications devices (I/O cards, controllers, programmable logic controllers, modems, CSU/DSUs, hubs, and multiplexors) up and running.
  • Easy installation with Quick-Connect connectors—right at the port—just strip the cable and insert.
  • Spring-loaded design prevents wires from loosening, corroding, or becoming brittle.


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  • Protection for RS-232 and Token Ring.
  • Low shunt capacitance to reduce signal loss.
  • State-of-the-art avalanche diode technology.
  • Protection for RS-232 and Token Ring.
  • Low shunt capacitance to reduce signal loss.
  • State-of-the-art avalanche diode technology.
Clamp Voltage ±18 V
CE Approval Yes
Size 1.5"H x 3.5"W x 5.4"D (3.8 x 8.9 x 13.7 cm)
Weight 0.5 lb. (0.2 kg)

Part Code:

SP522A-R2

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Black Box SP522A-R2 Eight-Wire Token Ring and RS-232 Surge Protector

Black Box SP522A-R2 Eight-Wire Token Ring and RS-232 Surge Protector

  • Keep your network and communications devices (I/O cards, controllers, programmable logic controllers, modems, CSU/DSUs, hubs, and multiplexors) up and running.
  • Easy installation with Quick-Connect connectors—right at the port—just strip the cable and insert.
  • Spring-loaded design prevents wires from loosening, corroding, or becoming brittle.