Surge Protection Device (SPD)
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This page explains how Thermal Disconnector 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 safety component within a Surge Protection Device (SPD) that automatically disconnects the circuit when excessive heat is detected, preventing fire hazards.
Technical details and manufacturing context for Thermal Disconnector
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Rated Voltage | 230/400 V AC | Typical for low-voltage SPDsIEC 61643-1 |
| Rated Current | 16–63 A | Depends on SPD rating |
| Breaking Capacity | 10–50 kA | Must exceed prospective short-circuit currentIEC 60947-2 |
| Response Time | ≤0.1 s | Fast disconnection to prevent overheating |
| Operating Temperature | -40–85 °C | Extended range for outdoor useIEC 60068-2-1 |
| Rated Voltage (DC) | 500–1000 V DC | For PV applicationsIEC 61643-31 |
| Insulation Resistance | ≥100 MΩ | At 500 V DC |
| Dielectric Strength | 2.5–4 kV | Withstands impulse voltageIEC 60243-1 |
| Thermal Trip Temperature | 120–150 °C | Melting point of fusible alloy |
| Housing Material | UL94 V-0 | Flame-retardant thermoplasticUL 94 |
| Degree of Protection | IP20–IP65 | IP65 for outdoor enclosuresIEC 60529 |
| Weight | 50–150 g | Varies with current rating |
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 Thermal Disconnector.
This component is essential for the following industrial systems and equipment:
| pressure: | Atmospheric pressure only (non-pressurized component) |
| other spec: | Current rating: 10A to 100A, Voltage rating: Up to 600V AC/DC, Response time: <5 seconds at threshold temperature |
| temperature: | Operating range: -40°C to +85°C, Trip threshold: 85°C to 120°C (adjustable) |
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.
3 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.
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A practical evidence checklist for RFQ preparation and supplier evaluation.
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The thermal disconnector monitors the temperature of the SPD's surge-arresting elements, such as the MOV. If these components overheat due to sustained overvoltage, repeated surges, or end-of-life failure, the disconnector opens the circuit permanently, preventing fire, smoke, or damage to surrounding equipment.
It uses a low-melting-point solder or a thermally sensitive latch that holds electrical contacts closed under normal temperatures. When heat from the surge-arresting element exceeds a threshold, the solder melts or the latch releases, and a spring forces the contacts apart, creating a permanent open circuit.
Typical rated voltages are 230/400 V AC and 500–1000 V DC for PV applications. Rated currents range from 16 to 63 A, and breaking capacity is 10–50 kA. Response time is ≤0.1 seconds. These are reference ranges; confirm with the manufacturer for your specific model.
No, it is a one-time device. Once the thermal disconnector trips, it must be replaced. The visible indicator (often a colored flag) shows that disconnection has occurred, and the SPD should be serviced or replaced.
Editorial classification, named public sources where available, and source-reviewed manufacturer records.
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