KSD302X 250V 20A Bipolar Temperature Switch 4-Pin Manual Reset
KSD302X 250V 20A Bipolar Temperature Switch 4-Pin Manual Reset
KSD302X 250V 20A Bipolar Temperature Switch — 4-Pin Manual Reset Thermostat
Keep your heating appliances and electrical equipment running safely and efficiently with the KSD302X Bipolar Temperature Switch. This compact, durable thermostat switch is engineered to monitor and control temperature within a precise 75–95°C range, automatically interrupting the circuit when a set threshold is reached and restoring it via manual reset. It's an essential component for DIY appliance repair, custom heater builds, and industrial wiring projects.
Key Features
- Rated Voltage & Current: 250V AC / 20A — handles demanding electrical loads with confidence
- Temperature Range: 75°C – 95°C operating thresholds to suit a variety of heating applications
- 4-Pin Bipolar Design: Interrupts both poles of the circuit simultaneously for enhanced safety
- Manual Reset: Requires deliberate reset after activation, preventing unintentional restart
- Compact Form Factor: 6 × 40 mm metal housing fits neatly into tight enclosures and appliance panels
- Durable Metal Construction: Robust build quality suitable for repeated thermal cycling
- Versatile Application: Ideal for water heaters, coffee makers, hair dryers, industrial heating elements, and more
Specifications
| Model | KSD302X T |
| Rated Voltage | 250V AC |
| Rated Current | 20A |
| Temperature Range | 75°C – 95°C |
| Pin Configuration | 4-Pin Bipolar |
| Reset Type | Manual Reset |
| Material | Metal |
| Dimensions | 6 × 40 mm |
What Is a Bipolar Temperature Switch?
A bipolar (double-pole) temperature switch opens both the live and neutral conductors simultaneously when the target temperature is reached. This is a critical safety feature in many heating appliances, ensuring that no residual voltage remains in the circuit after a thermal event. The manual reset mechanism means the device must be physically reset before the appliance can operate again — adding an extra layer of protection against repeated overheating cycles.
For guidance on electrical component safety standards, refer to the U.S. Consumer Product Safety Commission (CPSC), which provides resources on safe use and compliance for electrical and appliance components.
Common Applications
- Domestic & commercial water heaters
- Electric kettles and coffee machines
- Hair dryers and personal care appliances
- Industrial heating elements and ovens
- DIY electronics and appliance repair projects
- Custom thermal protection circuits
Frequently Asked Questions
Q: What does the KSD302X 4-pin bipolar temperature switch do?
A: The KSD302X is a manual-reset thermostat switch that monitors circuit temperature and interrupts power on both poles simultaneously when the set threshold (between 75°C and 95°C) is reached. This helps protect appliances and heating elements from overheating. Once tripped, it must be manually reset before the circuit can be re-energized.
Q: What is the difference between bipolar and single-pole temperature switches?
A: A bipolar (double-pole) switch opens both the live and neutral lines at the same time, completely isolating the load from the power source. A single-pole switch only interrupts one conductor. For appliances where full circuit isolation is required for safety, a bipolar switch like the KSD302X is the preferred choice.
Q: Is the KSD302X compatible with 110V/120V systems as well as 250V?
A: Yes. The KSD302X is rated at 250V AC / 20A, meaning it can safely operate at voltages below its rating, including 110V and 120V systems, as long as the current does not exceed 20A.
Q: How do I select the correct temperature rating (75°C, 80°C, 85°C, etc.) for my application?
A: Choose a trip temperature slightly above your appliance's normal maximum operating temperature but well below its damage threshold. For example, if your heater typically runs at 70°C, an 80°C or 85°C rated switch provides a suitable safety margin. The available range for this model is 75–95°C.