Figure 3. The Phoenix Contact 2907916 PLT-SEC Series Type 3 surge protection device with a nominal voltage rating of 24 V AC/DC (Image source: Phoenix Contact).
Figure 3 shows the Phoenix Contact 2907916 PLT-SEC Series Type 3 SPD that can be placed near sensitive electrical components, such as programmable logic controllers (PLCs) or control units. It is suitable for final-stage protection against residual surges that pass through upstream protection. Additionally, it includes a DIN rail-mounted base and a plug-in protection module and is rated for 24 V AC/DC low-voltage, single-phase circuits. Its remote signaling contact ratings are 250 VAC / 125 VDC, 0.5 A for remote alerts or panel indicators.
Conclusion As industrial control systems become increasingly complex, integration of surge protection devices has become essential. By clamping transient overvoltages, SPDs protect the electronic and electrical components housed within control cabinets. Selecting the correct SPD is vital for meeting the specific requirements of an industrial facility. Key factors in this selection process include the MCOV and the nominal discharge current. A layered protection strategy, utilizing UL Type 2 and Type 3 devices, is crucial for enhancing the resilience of industrial operations.
Sources: https://library.e.abb.com/public/ d2318d61b512403288bf9c438daaf 9d1/1TXH000565C0201_Global_gui de_to_surge_protection_EN_BR.pdf https://www.perle. com/downloads/surge- protectors/5131327_tt_basics_ surge_protection_en.pdf https://www.nemasurge.org/how- spd-s-work/#modes
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