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| Thermal Switch Products
Aerospace - Redmond (Defense & Space) |
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250 Series
Thermal Switch
designed for applications requiring high current capacity in high vibration and shock environments
ALSO SEE: High Current High Reliability Switches
THERMAL SWITCHES exported from the United States must be done in accordance with the Export Administration Regulations (EAR) and/or the International Traffic in Arms Regulations (ITAR) as applicable. |
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 JUST RELEASED! MIL-PRF-24236/29
"Switches, Thermostatic, (Bimetallic),
Type 1, Hermetically sealed,
Single Pole, Single Throw (SPST), 10 Ampere" |
| DOWNLOAD |
DESCRIPTION |
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OUTLINE DRAWINGS of high current switches, capable of handling up to 10 amps, with a potential cycle life of over 1,000,000 cycles.
Honeywell manufactures the 250 Series Thermal Switch in 9 basic configurations. Dash numbers are also available in multiple configurations - selection is not limited to those listed - consult factory for details. Click on the dash number to open the outline drawing. |
| 250 Thermal Switch Product Brochure [.pdf] |
Contains performance specifications, configuration drawings and sample ordering codes for this product (requires Adobe Acrobat). |
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Application Examples:
- Aircraft window heat controllers and defrosters
- Space Station pump control for liquids
- Battery and compartment temperature control and
overheat
- Power supply overtemperature
- Railroad step defrosters
- Gun mount mechanism de-icing
- Ship gun turrets
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Features:
- High ampere rating
- Exceptional thermal stability
- 1 million cycle life at reduced currents
- Rugged all welded hermetic construction
- Solder terminals, screw lugs, or lead wires are available
- Environmental temperature range from -85°F to +350°F
- Differential range from 5°F to 35°F
- High vibration resistance
- Crisp SPST or TCST contact operation
- Available in 10 standard configurations
- Contacts open or close on rising temperature
- Custom units with special plating, lead wires,
or overmolds can be provided (consult factory)
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Specifications for 250 Series Thermal Switches
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Performance
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| Contact Arrangement: |
SPST; TCST (Two Circuit, Single Throw)
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| Electrical Ratings: |
10 Amperes Resistive 28VDC 100,000 cycles
15 Amperes 115 VAC 60 Hz 100,000 cycles
3 Amperes Resistive 55 VDC 100,000 cycles
.75 Amperes Inductive 75 VDC 1,000,000 cycles
4.5 Amperes Inductive 28 VDC 10,000 cycles |
| Endurance: |
100,000 cycles minimum @ rated DC or AC loads |
| Insulation Resistance: |
1000 megohms minimum @ 500 VDC |
| Dielectric Withstanding Voltage:
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1500 VAC RMS - terminals to case
500 micro amperes maximum leakage |
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Environmental (MIL-STD-202)
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| Vibration: |
Meth. 204,
15.4 grms, 10 to 2000 Hz |
| Shock: |
Meth. 213,
100g/6ms, 750g/0.5ms
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| Thermal Shock: |
Meth. 107, Cond. B, -85 to +257°F |
| Acceleration: |
Meth. 212, Cond. A, 20g |
| Moisture Resistance: |
Meth. 106, 240 hrs., 98% RH & from +77- +149°F
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| Hermetic Seal: |
Meth. 112, Cond. B |
| Salt Spray: |
Meth. 101, Cond. B, 48 hours |
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Tolerance Limits |
Specified Temp Setpoint Range |
Standard Setpoint Tolerance |
°F (°C) |
°F (°C) |
-85 to 230 (-65 to 110) |
±5 (2.8) |
231 to +350 (111 to 177) |
±7 (3.9) |
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Honeywell's 250 Series snap-action thermal switches are specifically designed for applications requiring high current capacity in a high vibration and shock environment.
The hermetic all-welded construction of the 250 Series allows use in a broad range of temperature and altitude applications. It is available in nine standard configurations and comes with either solder terminals or screw type lugs.
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Contact Us, if you have questions, need more information,
or are interested in ordering 250 Series Thermal Switches.
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