TELEMATIC SD32X | 32V Surge Protection Device | Signal & I/O Protector

Description

The TELEMATIC SD32X is a compact surge protection device from the Telematic SD Series, designed to protect industrial process signals and I/O circuits from transient surges. It is the X version without the optional replaceable fuse/disconnect package, making it suitable for applications where a fuse is not required.

The SD32X is designed for 32 V maximum working-voltage applications and is commonly used with 4–20 mA loops, controller outputs, digital signals, alarms, LEDs and solenoid-valve circuits. The manufacturer documentation describes the SD Series as a multi-stage hybrid surge-protection system with up to 10 kA maximum surge current and DIN-rail mounting.

🔹 Product Datasheet

The available technical documentation specifies approximately 70 g weight, 2.2 Ω nominal line resistance, 5 µA maximum leakage current and a 25 kHz bandwidth for the SD32X.

 

🔹 Main Features

⚡ 32 V Surge Protection
Designed for signal circuits with working voltages up to approximately 32 V.

🛡️ Transient Surge Protection
The SD Series uses multistage hybrid protection circuitry and is rated for surge currents up to 10 kA.

🔌 No-Fuse Design
The SD32X is the X version of the SD32 and does not include the optional replaceable fuse/disconnect package.

📡 Signal Protection
Suitable for industrial analog and digital signal circuits, including controller outputs and process I/O.

📏 Low Resistance
The approximately 2.2 Ω nominal line resistance helps limit the effect of the protector on connected signal circuits.

🔧 DIN-Rail Installation
The compact design allows installation inside industrial control cabinets and instrumentation panels.

 

🔹 Operating Procedure — How to Use

1. 🔍 Confirm the model is SD32X.
2. ⚡ Verify that the circuit operating voltage is suitable for the 32 V protection rating.
3. 🔌 Identify the field-side and protected-side wiring.
4. 🔧 Mount the SD32X securely on the DIN rail.
5. 🛡️ Connect the grounding/earth terminal to the appropriate low-impedance protective earth system.
6. 📡 Connect the field signal to the field-side terminals.
7. 🔌 Connect the protected signal to the control-system side.
8. 🔍 Check that polarity and terminal assignment are correct.
9. ⚡ Energize the protected circuit.
10. 📊 Verify that the PLC, DCS, controller or instrument receives the expected signal.
11. 🔄 After a surge event, inspect the complete installation and connected equipment before returning it to normal service.

 

🔹 Typical Applications

The SD32X can be used for:

📈 4–20 mA analog loops
The SD Series documentation recommends SD32/SD32X for suitable transmitter and analog-output applications depending on the operating voltage.

⚙️ Controller Outputs
It can protect controller outputs connected to I/P converters.

🔘 Digital Inputs
SD-series X versions can be used for switch and digital signal protection where the operating voltage is appropriate.

🚨 Digital Outputs
The SD32X is specifically recommended for circuits such as alarms, LEDs and solenoid valves with a maximum circuit voltage of 32 V.

🏭 PLC / DCS / SCADA I/O
It can be installed as a signal-protection interface between field wiring and industrial control equipment.

 

🔹 Power-Up Sequence

The SD32X is a passive surge protection device, so it does not have a conventional CPU-style boot sequence.

A recommended commissioning sequence is:

1. 🔒 Isolate the signal circuit.
2. 🔍 Check the SD32X model and voltage rating.
3. 🔧 Confirm DIN-rail mounting.
4. 🛡️ Verify the protective-earth connection.
5. 🔌 Check field-side wiring.
6. 🔌 Check protected-side wiring.
7. 📏 Verify polarity and continuity.
8. ⚡ Energize the field circuit.
9. 📊 Verify the signal at the PLC/DCS/controller.
10. ✅ Confirm normal signal operation.

 

🔹 Shutdown Sequence

1. 🛑 Place the associated control loop into the approved maintenance condition.
2. ⚡ Isolate the field power.
3. 🔌 Isolate the protected equipment if required.
4. 🔒 Apply lockout/tagout where applicable.
5. 🔧 Disconnect the signal wiring.
6. 🧤 Inspect the SD32X before removing it from the DIN rail.

Because the SD32X is passive, there is no separate controller shutdown command.

 

🔹 Installation Notes

🧲 Grounding

Good surge protection depends heavily on the quality of the grounding and bonding system. The protector should have a short, low-impedance connection to the appropriate protective-earth system.

📡 Cable Routing

Keep protected signal wiring separated from high-energy power and switching cables wherever practical.

⚡ Voltage Matching

Do not select an SD32X merely because the nominal system voltage is “24 V.” The maximum operating voltage and signal characteristics must be checked.

🔄 Protection at Both Ends

For long outdoor signal runs, protection requirements may differ from a short cabinet-to-cabinet connection. The overall cable route and possible surge entry points should be evaluated.

 

🔹 Common Questions & Answers

Q1: What is TELEMATIC SD32X?

A: It is a 32 V surge protection device for industrial signal and I/O circuits.

Q2: Is SD32X a PLC module?

A: No. It is a passive surge protection device, not a PLC, DCS I/O module or controller.

Q3: What is the difference between SD32 and SD32X?

A: The SD32X is the version without the optional fuse/disconnect package. The standard SD32 can be supplied with the replaceable fuse/disconnect arrangement.

Q4: What is the maximum working voltage?

A: The SD32X is specified for a maximum working voltage of approximately 32 V.

Q5: Can SD32X protect 4–20 mA signals?

A: Yes. The SD Series documentation identifies SD32/SD32X as suitable for appropriate 4–20 mA transmitter and controller-output applications.

Q6: Can it protect digital signals?

A: Yes. The SD Series includes SD32X among the suitable choices for digital input circuits and specifically recommends SD32/SD32X for digital outputs such as alarms, LEDs and solenoid valves within the appropriate voltage range.

Q7: Does SD32X require a separate power supply?

A: No. It is a passive surge protection device and does not require an independent power supply.

Q8: Does SD32X have a replaceable fuse?

A: No. The “X” version is the no-fuse version.

Q9: What is the approximate weight?

A: Approximately 70 g according to the available SD Series technical data.

Q10: Where is SD32X normally installed?

A: It is normally installed inside an industrial control or instrumentation cabinet, between field wiring and protected PLC, DCS, SCADA or instrument circuits.

 

🔹 Recommended TELEMATIC Models / Series

1. TELEMATIC SD07X | 7 V Surge Protection Device
2. TELEMATIC SD16X | 16 V Surge Protection Device
3. TELEMATIC SD32X | 32 V Surge Protection Device
4. TELEMATIC SD55X | 55 V Surge Protection Device
5. TELEMATIC SD32 | 32 V Surge Protection Device with Fuse/Disconnect
6. TELEMATIC SD55 | 55 V Surge Protection Device with Fuse/Disconnect
7. TELEMATIC SD32T3 | 3-Wire Transmitter Surge Protector
8. TELEMATIC SDRTD | RTD Surge Protection Device
9. TELEMATIC SDPSTN | PSTN/Telemetry Surge Protection Device
10. TELEMATIC SD275X | 275 V AC Surge Protection Device

The SD07X, SD16X, SD32X and SD55X are members of the same X-version surge-protection family, while SD32T3, SDRTD, SDPSTN and SD275X address specialized transmitter, RTD, telecom and AC applications.

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