Product Description:
Qimao Electronic KSD301 Thermostat 60°C 10A Normally Closed N.C Snap Disc Limit Control Switch Microwave Thermostat unit is set to open at 60°C, which is a lower action point than most general-purpose versions. That makes it suitable for applications where the protected component cannot tolerate high surface temperatures—microwave magnetrons, control boards, and small transformers are typical examples. The disc snaps open at 60°C and re-closes automatically after the surface cools, usually 10–30K below the action point. Contacts are normally closed, so the circuit is live at room temperature and cuts out on rise. Rated 10A at 250VAC resistive. No calibration screw, no external sensor. The thermostat works as a standalone thermal switch.
Specification:
| Item | Typical |
|---|---|
| Product Name: | KSD301 Thermostat 60°C 10A Normally Closed N.C Snap Disc Limit Control Switch Microwave Thermostat |
| Model: | KSD301-06 |
| Type: | Snap-action bimetallic disc thermostat |
| Contact Rating: | 250VAC 10A / 125VAC 15A (customizable) |
| Opertaing Temperature: | -20°C to +180°C (set point range) |
| Reset Type: | Auto reset / Manual reset |
| Set Point Tolerance: | ±3°C to ±5°C (depending on model) |
| Switching Life: | 100,000 cycles minimum |
| Contact Resistance: | ≤50 mΩ |
| Insulation Resistance: | ≥100 MΩ at 500VDC |
| Dielectric Strength: | 1500VAC for 1 minute |
| Terminal: | 4.8mm / 6.3mm quick connect, screw, or lead wire |
| Housing: | Phenolic / ceramic / sealed metal case |
| Mounting: | Fixed bracket, flange, or custom |
Working Principle:
The KSD301 Thermostat 60°C 10A Normally Closed N.C Snap Disc Limit Control Switch Microwave Thermostat uses a bimetallic disc as both sensor and switch. At room temperature the disc stays convex, holding the normally closed contact together. When the mounting surface reaches 60°C, the disc snaps to concave, pushing the contact open and cutting power to the protected circuit. As the surface cools, the disc snaps back at the reset point, typically 10–30K below the action temperature, and the contact closes again. There is no coil, no spring, and no external sensor—the disc does everything. Response is fast and repeatable, and the trip point does not drift with age.
Features:
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KSD301 Thermostat 60°C 10A Normally Closed N.C Snap Disc Limit Control Switch Microwave Thermostat action point, factory-set
Disc is formed and heat-treated to snap at 60°C. No field calibration, no drift over time. Chosen for components that cannot tolerate higher surface temperatures. -
Normally closed SPST
Circuit is closed at room temperature and opens when the disc reaches 60°C. Fail-safe logic for overheat protection. -
Automatic reset, 10–30K differential
Contact re-closes after the surface cools below the reset threshold. No manual reset button needed. -
10A / 250VAC resistive rating
Covers most microwave and small-appliance loads. Inductive loads require derating or arc suppression. -
Flat 6.3mm terminals
Standard quick-connect or direct solder. Low wiring profile for tight enclosures. -
≤50mΩ circuit resistance
Low voltage drop at rated current, less self-heating at the contact. -
Silver contacts
Resists oxidation and pitting, especially useful at low action points where the contact may cycle more often. -
Snap action with minimal arcing
Fast contact opening reduces arc duration and RF interference. Suitable near control electronics. -
Compact phenolic housing
Sized for tight spaces near the protected component. Adequate for 60°C action points. -
50,000+ cycle life
Rated at resistive load. In protection-only applications, life is limited by age rather than cycling.
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Application:
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KSD301 Thermostat 60°C 10A Normally Closed N.C Snap Disc Limit Control Switch Microwave Thermostat for microwave ovens
Thermal cutoff on the magnetron, transformer, or cavity wall. Opens before these components overheat. -
Control boards and power supplies
Protects driver circuits and power stages. Compact body fits on or near the board. -
Small transformers
Limits winding temperature under overload or blocked ventilation. -
LED drivers and power supplies
Low action point prevents thermal runaway in enclosed fixtures with limited airflow. -
Coffee makers
Secondary protection behind the main cycling thermostat. Opens if the primary control fails. -
Water dispensers
Dry-boil protection on the heating plate. Auto-reset version re-closes after cooling. -
Electric heaters
Surface temperature limit where 60°C is the design ceiling, such as panel heaters or warming plates. -
Automotive electronics
Thermal protection for control modules and sensors. Compact body fits inside enclosures.
Customization:
We offer customized service to our client, if you need the KSD301 Thermostat 60°C 10A Normally Closed N.C Snap Disc Limit Control Switch Microwave Thermostat or OEM/ODM welcome contact us!!
Step 1 — Temperature
Start with the temperature you need the thermostat to trip at. We set the disc anywhere from 40°C to 220°C, held within ±5°C of your target. If your application also needs a specific reset point, tell us—differential can be tuned as well.
Step 2 — Electrical Parameters
Let us know what the thermostat will be switching. Voltage, current, and whether the load is resistive or inductive all affect the contact design. Our standard 10A/250VAC rating covers most cases, but inductive or higher-current loads may call for derating or a different contact setup.
Step 3 — Terminal and Mounting
Flat terminals can be bent, lengthened, or resized. Ring dimensions, housing height, and bracket style are all open to modification. A drawing or sample speeds things up.
Step 4 — Sample Build
Samples ship in 7–10 days, tested for action temperature, contact resistance, and snap consistency.
Step 5 — Verification
Test the sample in your application. We adjust disc heat treatment or contact gap if needed. One or two rounds is typical.
Step 6 — Production
After approval, parameters are locked and batches are sampled at load. Custom parts ship in 15–20 days.
