DC Input Section
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This page explains how Surge Protection Device (SPD) is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.
A protective electrical device installed in the DC input section to limit transient overvoltages and divert surge currents to ground.
Technical details and manufacturing context for Surge Protection Device (SPD)
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Nominal Discharge Current (In) | 20 kA | 8/20 µs current wave; higher values indicate better surge handling.IEC 61643-1 |
| Maximum Discharge Current (Imax) | 40 kA | Single 8/20 µs pulse; must exceed In for robust protection.IEC 61643-1 |
| Voltage Protection Rating (Up) | ≤1.5 kV | Lower is better; must be below equipment withstand voltage.IEC 61643-1 |
| Rated Voltage (DC) | 500 V DC | For PV systems; match system open-circuit voltage.IEC 61643-31 |
| Maximum Continuous Operating Voltage (Uc) | 600 V DC | Must exceed system max voltage including tolerance.IEC 61643-1 |
| Response Time | ≤25 ns | Faster clamping protects sensitive electronics.IEC 61643-1 |
| Operating Temperature Range | -40–85 °C | Extended range for outdoor PV installations.IEC 60068-2-1/2 |
| Degree of Protection (IP) | IP65 | Dust-tight and protected against water jets.IEC 60529 |
| Connection Cross-Section | 2.5–35 mm² | Flexible or rigid; must handle surge current without overheating.IEC 61643-1 |
| Enclosure Material | UL94 V-0 | Flame-retardant thermoplastic; ensures fire safety.UL 94 |
| Weight | 0.3–0.5 kg | Typical for DIN-rail mount; affects mounting logistics. |
| Dimensions (H×W×D) | 90×36×65 mm | Standard modular width for DIN-rail mounting. |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
Commonly used trade names and technical identifiers for Surge Protection Device (SPD).
This component is essential for the following industrial systems and equipment:
| current: | Up to 30kA surge current (8/20μs) |
| voltage: | Up to 1500V DC |
| other spec: | IP65 rating for dust/water protection |
| temperature: | -40°C to +85°C |
Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.
Quoted from the published standard.
12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.
Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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Nominal discharge current (In) is the peak current the SPD can handle for a 8/20 µs current wave, typically 20 kA, indicating its surge handling capability under repeated events. Maximum discharge current (Imax) is the peak current for a single 8/20 µs pulse, typically 40 kA, representing the absolute maximum the device can withstand once without failure. Imax must exceed In for robust protection.
The rated voltage (DC) should match the system's open-circuit voltage. For example, a 500 V DC rating is suitable for systems with a maximum open-circuit voltage up to 500 V. Always ensure the maximum continuous operating voltage (Uc) of 600 V exceeds the system's maximum voltage including tolerance, as per IEC 61643-1.
The voltage protection rating (Up) is the voltage level that appears across the SPD terminals during a surge event. A lower Up is better, as it indicates the device clamps the voltage to a lower level. It must be below the withstand voltage of the protected equipment to prevent damage. For this SPD, Up is ≤1.5 kV.
Response time is the time it takes for the SPD to switch from high-impedance to low-impedance state after a surge. A faster response time (≤25 ns) ensures that the voltage is clamped quickly, protecting sensitive electronics from transient overvoltages. Slower response times may allow damaging voltage spikes to reach the equipment.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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