What's New - Model MDCAT Gigabit Ethernet Surge Protector Protects PoE Devices from Lightning Induced Surges

Figure 1. MDCAT External Appearance and Dimensions

Power-over-Ethernet compatible
1000BASE-T / 100BASE-TX / 10BASE-T
Ideal to protect network devices powered from Ethernet such as webcams
Conforms to IEC 61643-21, Categories C1, C2

M-System’s model MDCAT is specifically designed to protect communication devices connected via Ethernet LAN from lightning surge entering through network cables.

1000BASE-T and PoE
Multi-stage protection is provided for all four pairs of conductors in Cat. 5e performance (1000BASE-T, 100BASE-TX and 10BASE-T) with minimal interference, tested for up to the maximum 100 meter segment length as defined in the standard. An equal level of protection is ensured for the core-to-core voltage used for PoE.

Both Alternative A and Alternative B configurations are usable to supply power to the protected network device.

Figure 2. MDCAT application examples.

Installation Options and DIN Rail Grounding
Compact module can be placed close to PCs, wireless hubs/switches and webcams in rolled-up LAN cables. It can also be snapped on a DIN rail for high-density mounting in a 19-inch rack together with Ethernet switches or inside a control panel with PLCs. Individual earth wiring is not necessary when you ground the DIN rail.


Figure 3. Clustered mounting on a DIN rail.		Figure 4. DIN rail grounding & shortcircuit bar.

Shield/Grounding Options
Shield terminal, frame grounding, signal grounding may be provided or not depending on the protected devices. The MDCAT is provided as ‘grounding’ mode with a shortcircuit bar connecting the shield and the ground terminals. Removing the bar turns the module to ‘floating’ mode, so that a ground loop problem can be easily fixed. By separating the shield and the ground, the former terminal can be used for individual signal grounding.

Table1. Performance

	LINE-LINE per signal pair	LINE-LINE PoE	LINE-EARTH
Max. continuous operating voltage Uc	±6 V	±58 V	±150 V
Voltage protection level Up	±15 V max. @2 kV	±100 V max. @2 kV	±600 V max. @4 kV
Leakage current @Uc	25 µA	25 µA	5 µA
Response time	4 nsec. max.	4 nsec. max.	20 nsec. max.
Max. discharge current Imax	100 A	100 A	10 kA
Nominal current IN	1 A
Series resistance	Approx. 0 Ω

Every year lightning destroys millions of dollars of sensitive electronic equipment. Millions more are lost through extended down time and loss of production or mission-critical information.

That’s why companies around the world depend on on-line M-Rester Lightning Surge Protectors. The M-Rester absorbs only the lightning surges with no interruption of instrumentation signal.

Product Bulletins
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Figure 5. Circuit diagram and connection example.