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S-Pro Series SPD
S-Pro series of SPD is primarily designed to protect field devices such as transmitters, switches, frequency signals, communication equipment, thermistors, thermocouples, and other field instruments connected via two-wire or three-wire systems, as well as control room equipment including DCS and PLC I/O systems, safeguarding them from damage caused by surges or operational voltages.
Product Advantage
S-Pro Series Surge Protectors feature the following key functions:
1) Ultra-slim 7.6mm housing for space-saving installation
2) Flexible grounding options via rail or terminal connections for broad applicability
Technical Parameters

Product Uses
Transmitters, switches, frequency signals, communication equipment, thermistors, thermocouples, and other field devices connected via two-wire or three-wire systems, as well as I/O devices such as DCS and PLC systems in the control room.
S-Pro series of SPD is primarily designed to protect field devices such as transmitters, switches, frequency signals, communication equipment, thermistors, thermocouples, and other field instruments connected via two-wire or three-wire systems, as well as control room equipment including DCS and PLC I/O systems, safeguarding them from damage caused by surges or operational voltages.
Product Advantage
S-Pro Series Surge Protectors feature the following key functions:
1) Ultra-slim 7.6mm housing for space-saving installation
2) Flexible grounding options via rail or terminal connections for broad applicability
Technical Parameters

Product Uses
Transmitters, switches, frequency signals, communication equipment, thermistors, thermocouples, and other field devices connected via two-wire or three-wire systems, as well as I/O devices such as DCS and PLC systems in the control room.
Q. Model notation: S(P)-5(24)-L(D)2(3)
S: Signal type, P: Power supply type
5: Rated operating voltage up to 5VDC, 24: Rated operating voltage up to 24VDC
L: Rail-mounted two-wire system, D: Base-mounted system
2: Two-wire system, 3: Base-mounted three-wire system
Q. Selection Guidelines: How to choose the appropriate SPD for different field applications:
1) Select the P series for power supply applications, compatible with 24VDC.
2) S-5-L(D)3 is suitable for signals with rated operating voltages up to 5VDC, such as resistance temperature detectors (RTDs) and thermocouples.
3) S-24-L(D)3 is suitable for transmitters, valve positioners, electromagnetic flowmeters, switches, frequency signals, communication equipment, 4–20mA analogue signals, and other field devices, as well as control room DCS/PLC I/O signals with rated operating voltages up to 24VDC (due to differing protection standards, S-24-L2(3) is not recommended for 5VDC or lower applications)
Q. Signal Connection Query: Can the SPD be reverse-connected?
No. Reverse connection will cause the product to lose its original surge protection capability. This product employs a multi-level, coordinated protection system: high-energy surges are first mitigated by the gas discharge tube, followed by protection from the TVS diode to safeguard the equipment.
Q. Model notation: S(P)-5(24)-L(D)2(3)
S: Signal type, P: Power supply type
5: Rated operating voltage up to 5VDC, 24: Rated operating voltage up to 24VDC
L: Rail-mounted two-wire system, D: Base-mounted system
2: Two-wire system, 3: Base-mounted three-wire system
Q. Selection Guidelines: How to choose the appropriate SPD for different field applications:
1) Select the P series for power supply applications, compatible with 24VDC.
2) S-5-L(D)3 is suitable for signals with rated operating voltages up to 5VDC, such as resistance temperature detectors (RTDs) and thermocouples.
3) S-24-L(D)3 is suitable for transmitters, valve positioners, electromagnetic flowmeters, switches, frequency signals, communication equipment, 4–20mA analogue signals, and other field devices, as well as control room DCS/PLC I/O signals with rated operating voltages up to 24VDC (due to differing protection standards, S-24-L2(3) is not recommended for 5VDC or lower applications)
Q. Signal Connection Query: Can the SPD be reverse-connected?
No. Reverse connection will cause the product to lose its original surge protection capability. This product employs a multi-level, coordinated protection system: high-energy surges are first mitigated by the gas discharge tube, followed by protection from the TVS diode to safeguard the equipment.
