Contact us for an immediate quote at

Indoor Med Power 10/100 Base-T Shielded CAT5 Lightning Surge Protector




Import duties, taxes and any additional delivery or clearance charges, are not included in the item price or the quoted shipping cost. These charges are the responsibility of the Buyer.

Please check with your local customs office to determine any additional charges prior to purchase.

Continue Shopping or View Cart

The HyperLink HGLN-CAT5J is a compact indoor lightning surge arrestor which provides protection for CAT5 data applications. The unit is fully compatible with industry-standard Power-over-Ethernet (PoE) devices and 10/100 Base-T Ethernet networks, providing protection to both Ethernet data pairs as well as the PoE DC power feed. The unit supports both modes A and B of the 802.3af standard for of supplying DC power. Power can be fed up the CAT5 data pairs, 1-2, 3-6 or using the two unused pairs, 4-5, 7-8.

This protector is also available for 15 Volt and 24 Volt PoE applications, see model HGLN-CAT5J24.

High-speed semiconductors clamp any voltage, positive or negative on the wires. The limits are +/- 58 volts on the four cable pairs. The design utilizes Thyristor diode technology which has superior power handling capability compared to TVS or Zener diode based designs. The unit is compatible with both normal and inverted polarity voltage PoE equipment.

EMI Noise Suppression

The HGLN-CAT5J features shielded RJ45 jacks. This along with the HGLN-CAT5J's metal housing helps reduce the effects of EMI interference. Additional features include a ground lug and terminal is provided directly on the lightning protector housing providing superior grounding. For maximum protection from lightning on long cable runs, two HGLN-CAT5J can be used, one at each end of the cable.

This lightning surge protector is compatible with Cisco legacy network appliance products like Access Points, DC Injectors and other equipment supporting reverse polarity PoE pinouts.

For additional information and complete specifications, click the Data Sheet link below.

This protector is also available in a weather resistant model, AL-CAT5JW

Not sure which level of protection is required for your application?
View Our Model Comparison Chart.


  • Industrial grade cast aluminum construction with integral mounting feet
  • (2) Shielded RJ-45 jacks
  • 802.3af Modes A and B Power-Over-Ethernet compatible and Cisco® Reverse Polarity PoE compatible
  • Protects 4 data pairs
  • Supports use of shielded CAT5 cable