KSD9700 Bimetal Disc Thermal Switch 250V 5A Normally Closed
KSD9700 Bimetal Disc Thermal Switch 250V 5A Normally Closed
KSD9700 Bimetal Disc Temperature Switch – Normally Closed, 250V 5A
The KSD9700 Bimetal Disc Thermostat Switch is a compact, reliable thermal protector designed for precise temperature-triggered circuit control. Operating in a normally closed (N/C) configuration, this switch automatically opens the circuit when the set temperature threshold is reached, then resets once the temperature drops — making it an ideal safeguard for motors, transformers, heaters, and a wide range of electrical appliances.
Built with a durable alloy metal case and rated at 250V / 5A, the KSD9700 covers a broad working range of 15°C to 130°C, giving you flexible protection across many applications. Its compact head dimensions (20 × 7.5 × 3.5 mm) and 7.3 cm lead wires make installation straightforward even in tight spaces. CE certified for quality assurance. Made in Mainland China.
Key Features
- Model: KSD9700
- Switch Type: Normally Closed (N/C) Bimetal Disc Temperature Switch
- Rated Voltage/Current: 250V / 5A
- Temperature Range: 15°C – 130°C
- Material: Alloy metal case
- Lead Wire Length: 7.3 cm / 2.9 inches
- Head Dimensions: 20 × 7.5 × 3.5 mm (L × W × T)
- Certification: CE
- Warranty: 1 Year
What Is a Bimetal Disc Thermostat Switch?
A bimetal disc thermostat switch uses two bonded metals with different thermal expansion rates. When temperature rises to the rated threshold, the disc snaps open the circuit, cutting power and protecting your equipment from overheating. When the temperature falls back below the reset point, the disc snaps back and restores the circuit automatically — no manual reset required for most models.
Common Applications
- Electric motors and transformers
- Household heating appliances (hair dryers, irons, heaters)
- Battery packs and charging equipment
- Coffee makers, water heaters, and kitchen appliances
- LED lighting assemblies
- DIY electronics and prototyping projects
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Frequently Asked Questions
Q: What does "normally closed" mean for the KSD9700 bimetal disc temperature switch?
A: A normally closed (N/C) switch means the circuit is closed (conducting electricity) at room temperature. When the temperature reaches the rated trip point, the bimetal disc snaps and opens the circuit, cutting the electrical flow to protect the connected device. Once the temperature drops back down, the disc resets and the circuit closes again.
Q: What temperature ratings are available for the KSD9700 thermostat switch?
A: The KSD9700 series is available in a range of temperature trip points between 15°C and 130°C. Be sure to select the specific rated temperature that matches your application's required cutoff point for accurate thermal protection.
Q: Can I use this KSD9700 switch in DIY electronics or home appliance repairs?
A: Yes. The KSD9700 is widely used in both professional and DIY applications, including motor protection, household appliance repair, battery management systems, and custom electronics projects. Its compact size and standard lead wires make it easy to integrate into most builds.
Q: Is this temperature switch self-resetting?
A: Yes, most KSD9700 normally closed variants are auto-resetting. Once the temperature drops below the reset threshold, the bimetal disc snaps back to its original position, automatically restoring the circuit — no manual intervention needed.