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KSD305 series auto-reset bimetal defrost thermostat is a kind of waterproof bimetal defrosting refrigerator thermostat. It is of single-pole single-throw structure and works under resistive load.
This series of bimetal defrost thermostat is enveloped by epoxy resin. And it is widely used as heating compensated switch or automatic defrosting control switch in air-cooling frostless refrigerators.


Parameters :
Use | Defrosting/Temperature control/Protection |
Appliance | Refrigerators,Freezers, air-conditioner |
Reset type | Auto-reset, normal close and normal open |
Material | brass base |
Amperage | 16A/25A |
Operating Temperature | 0-50℃ |
Differential | |
Min. Diff | 8℃ |
Tolerance | |
Cold-resistant Temperature | / |
Limit of the tolerance(OFF) | ±3℃ |
Limit of the tolerance(ON) | ±5℃ |
Contact material | Silver |
Dielectric | Parts between electriferous components and non-electriferous ones can bear 2000V (3750V for Reinforced insulation type) 50Hz AC current, which is nearly sine wave, for one minute as bearing test. Resulted no breakdown, no flashover. |
Insulation | With a DC 500V megger, borne DC 500V, the tested value is over 10MΩ. |
Resistance | Below 50mΩ |
Temperature | Normal close, Normal open |
Maximum | 90℃ |
Diameter of | Φ12.8mm(1/2″) diameter:0.75mm2 / 0.5mm2 |
Approvals | TUV |
Line | Color: black/red/brown/blue Length: customized |
Terminal type | Customized (Refer to our specification |
Dimension of bimetal defrost thermostat:

Safety certificate :
Rates | Cycles | Max. OT | Certificate |
400V 16A | 30,000 | 40℃ | UL |
250V 25A | |||
125V 25A |
Major series of snap-action thermostats are as follows:
Series
| Diameter of bimetal disc
| Max. operating Temp.
| Max. | Switch structure
| Service purposes
|
rated | |||||
current | |||||
KSD301
| F12.8mm | 280°C
| 16A
| SPST
| Temperature control and overheating protection for low-duty electric heating applications.
|
(1/2″) | |||||
KSD301-U
| F12.8mm | 280°C
| 16A
| SPST
| One shot type fuse for low-duty electric heating applications.
|
(1/2″) | |||||
KSD302
| F22.25mm | 125°C
| 25A
| SPST
| Temperature control and overheating protection for high-duty electric heating applications.
|
(7/8″) | |||||
KSD303
| F12.8mm | 50°C
| 10A
| SPST
| Defrosting and temperature compensation for refrigerator.
|
(1/2″) | |||||
KSD305
| F22.25mm | ||||
(7/8″) | |||||
KSD306
| F22.25mm | 120°C
| 30A
| DPST
| Temperature control and overheating protection for electric heating applications such as water heater.
|
(7/8″) | |||||
KSD307 | F12.8mm (1/2″) | 220°C | 20A | SPST | PTC power cut out for electric heater, commercial appliance |
KSD308
| F19mm | 100°C
| 16A
| DPST
| Temperature control and overheating protection for electric heating applications such as water heater.
|
(3/4″) | |||||
KSD309
| F12.8mm | 280°C
| 16A
| SPST
| Temperature control and overheating protection for high temperature heating applications.
|
(1/2″) | |||||
KSD310
| F19mm | 50°C
| 35A
| SPST
| Defrosting for big current refrigerator, air conditioner or other commercial cooling appliances
|
(3/4″) | |||||
KSD312
| F19mm | 200°C
| /
| DPST
| Temperature limiter for rice cooker
|
(3/4″) | |||||
KSD314
| F19mm | 220°C
| 45A
| SPST
| Temperature control and overheating protection for big current heating applications.
|
(3/4″) | |||||
KSD315 | F19mm (3/4″) | 125°C | 16A | DPST | Manual reset for water heater protection |
NOTE: KSD305 BIMETAL DEFROST THERMOSTAT CAN BE CUSTOMIZED UPON YOUR REQUEST. FOR MORE INFORMATION ABOUT DEFROST THERMOSTAT, PLEASE REFER TO OUR WEBSITE:
(1)//thermostat-gb.com/html/Capillary_Thermostat/20150812/157.html
(2)//thermostat-gb.com/html/Capillary_Thermostat/Ranco_Thermostat/2015/0812/159.html
Advantages:
1. With more than 30 years experience of professional thermostat design,
manufacturing and customer service;
2. Have our own bimefal material R&D and production base;
3. With ability for integrating the different resources of the hole group and partners, to innovate and create value for different customers from different sectors and industries;
4. With various production lines and high efficient production capacity.


Q1:How can we get a quote?
A: Please offer the specification of the product, such as operating temperature, volt, current, application, quantity etc. Picture or drawing are welcome for our reference.
Q2: What is the MOQ?
A: Normally our MOQ is 1000 pcs. Larger quantity could win lower price.
Q3: What about the lead time?
A: It usually takes about only 7-15 days to produce KSD thermostat, KST thermostat and capillary thermostat would take longer time, which is about 30 days.
Q4:Which payment terms you can accept?
A: T/T, Western Union, L/C
Q5:Guarantee?
A: We offer 3 year guarantee.
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Getting more information about high temperature protector and limit switch, please refer to our website: www.thermostat-gb.com
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