Product Description:
Qimao Electronic Technology Bimetal Disc for Thermal Protector – KSD301 / Motor Protector, Custom Snap Disc Stamping, ISO Factory Direct, a precision-stamped bimetal disc built for KSD301 thermal protectors and motor protector assemblies. Each disc is blanked from qualified thermostatic bimetal strip, heat-treated, and calibrated to snap at your specified temperature. We supply the disc as a standalone component rather than a finished thermostat, so OEMs can integrate it directly into existing assembly lines. The point of the product is repeatability: same cup height, same thickness, same trip point, batch after batch. For protector builders who calibrate downstream, that consistency is what keeps their adjustment stations running at rate instead of chasing drift.
Product Content:
This Bimetal Disc for Thermal Protector – KSD301 / Motor Protector, Custom Snap Disc Stamping, ISO Factory Direct is a snap-action disc, formed and calibrated so it flips from concave to convex at a defined temperature and resets automatically on cooling. The snap comes from differential expansion between two bonded metal layers, but in production the theory matters less than control of geometry and temper. We hold cup height, diameter, and strip thickness to drawing, then verify every lot against its rated trip point before shipment. For KSD301 and motor protector customers, that means fewer calibration corrections, stable performance after repeated cycling, and a disc that behaves the same in the ten-thousandth piece as in the first. Drawings or physical samples both work as a starting point.
Specification:
| Item | Typical |
|---|---|
| Product Name: | Bimetal Disc for Thermal Protector – KSD301 / Motor Protector, Custom Snap Disc Stamping, ISO Factory Direct |
| Model: | KSD301-08 |
| Action Temperature: | 40℃ ~ 100℃ |
| Reset Temperature: | 0℃ ~ 60℃ |
| Temperature Tolerance: | ±5℃ |
| Salt Spray Test: | Available for 24h / 48h / 72h upon request |
| Main Application: | Hot Water Kettle Thermostat, Disc Thermostat (KSD301) |
| Feature: | Custom bimetal marking available, stable tripping performance |
Working Principle:
The Bimetal Disc for Thermal Protector – KSD301 / Motor Protector, Custom Snap Disc Stamping, ISO Factory Direct is made of two bonded metal layers with different thermal expansion rates. As temperature rises, the layer with the higher expansion coefficient stretches more, and because the two are bonded, that mismatch builds internal stress across the disc. At a calibrated point the stress overcomes the disc’s concave stability, and it snaps through center to the convex position, opening or closing the contact in one fast, decisive motion. On cooling, the stress reverses and the disc snaps back. The reset is automatic, with no manual action needed between trips.
What matters in production is calibration, not theory. The snap point depends on disc geometry, material temper, and heat treatment. A few microns of cup height or a slightly different temper grade will move the trip temperature, so we verify each batch against its rated snap point before shipment rather than trusting the strip certificate alone.
Features:
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Snap point verified per batch of Bimetal Disc for Thermal Protector – KSD301 / Motor Protector, Custom Snap Disc Stamping, ISO Factory Direct — Cup height and diameter held to drawing; each lot checked against rated trip temperature before packing, so downstream calibration doesn’t chase drift.
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Automatic reset without auxiliary mechanism — The disc returns to concave on cooling by material property, not by spring or lever, reducing failure modes in the housing.
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Burr-free blanked edge — Clean profile for vibratory feeding and pick-and-place; burrs cause jams and orientation errors that stop a line.
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Calibration 50°C to 240°C, set to your design — Trip point matched to your housing and contact force, not forced to a catalog value.
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Cup depth and dimple configurable — Tooling adjusts to non-standard profiles; tolerance impact quoted before you commit.
Application:
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Bimetal Disc for Thermal Protector – KSD301 / Motor Protector, Custom Snap Disc Stamping, ISO Factory Direct for KSD301 thermal protectors — Kettles, coffee makers, rice cookers. The disc is the sensing element that cuts power at the calibrated trip point; a drop-in component with documented batch calibration for existing assemblies.
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Motor thermal protectors — Drills, saws, pumps, fan motors. The disc sits inside the protector can and trips on winding temperature rise. Auto-reset means the tool recovers without user intervention.
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Office equipment cutoff — Printers, copiers, power supplies. Where housing space is tight, disc profile matters as much as trip accuracy.
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Custom protector assemblies — For OEMs building their own protector rather than buying a finished thermostat; we supply the disc to your drawing, you control the assembly.
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Seat heater and accessory heating — Automotive circuits where a stamped disc replaces a catalog thermostat inside a custom enclosure, trip point matched to the thermal mass of the specific seat design.
Customization Service:
The Bimetal Disc for Thermal Protector – KSD301 / Motor Protector, Custom Snap Disc Stamping, ISO Factory Direct is a component, not a finished device. In KSD301 and similar assemblies it seats inside the metal cup or housing, held in position by the contact mechanism. Handle with clean tweezers or vacuum pick-up; finger oils can affect thermal response over time. Never flex, bend, or drop the disc onto hard surfaces, as this shifts the calibrated snap point and the trip temperature will no longer match its rating. Make sure the disc seats flat in its pocket without binding or rocking. Do not deform the housing cup after installation, since any change in internal clearance alters trip temperature. Keep dry, under 40°C, away from corrosive environment, and keep discs in packaging until assembly, and avoid edge damage and contamination.
