|
|
| Thermal Switch Products
Aerospace - Redmond (Defense & Space) |
|
|
|
270 Space Series
High Current, High Reliability Space Switches
Commonly found on the Space Shuttle and International Space Station, these high quality units are capable of handling 42 VDC and greater that is required by the new power sources.
Large satellites, spacecraft, rocket boosters, life support systems and experimental modules can all have high volume thermal overtemperature and regulating needs. With a cycle life of over 100,000 cycles, the high reliability, hermetically sealed 270 SPACE SERIES thermal switch is Honeywell's answer to the Space Industry's ever-changing high-current requirements.
Space Station
Classified Defense Programs
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.
Application Examples:
- Non-standard buss voltages: 42 VDC to 130 VDC
- Inductive applications: motors, pumps, large heaters
- High current circuits @ 28VDC
|
Visit these NASA websites:
NASA Electronic Parts and Packaging Program
(NEPP)
NEPP Switch Specification Documents:
Contains a listing of NASA Goddard Space Flight Center (GSFC) specifications for EEE parts, including.
- S-311-641, "Switches, Thermostatic, General Requirements" [.pdf]
-
S-311-641/04 "Switch, Thermostatic, Bimetallic, SPST, High Power, Hermetic, Detail Specification" [.pdf]
EEE Parts for Space Applications: its purpose is to support parts engineers, designers, system assurance managers and project managers in selecting, testing and procurement of EEE parts for use on NASA programs/ projects by providing links to parts related documents developed by NASA centers and Defense Supply CenterColumbus (DSCC).
On the site, we encourage you to see the new EEE- INST-002 (GSFC Parts Document) - Supersedes 311- INST-001, Rev. A. The revised document has added derating guidelines and four new sections to provide instructions for plastic encapsulated microcircuits, crystals, heaters, and switches. Section S2 addresses thermal switches. Selection, Screening and Qualification requirements, as well as references to military specifications, and test methods have also been updated.
|
|
DOWNLOAD
TS270 Data Sheet Contains configuration drawings and sample ordering codes for this product. [.pdf - requires Adobe Acrobat Reader]
Honeywell manufactures the 270 Series Thermal Switch in 4 BASIC CONFIGURATIONS. Click on the dash number below to open the outline drawing:
Dash numbers are also available in custom configurations - selection is not limited to those shown above - consult factory for details
|
Features
- All welded construction
- 500 cycles of run-in while monitoring contact resistance, 50 milliohms max
- OperatingTemp range of -85ºF to +300ºF
- High Dielectric Withstanding voltage (DWV)
- Residual gas analysis
- Group B Testing
- Crisp, snap-action contact operation
- Rugged construction, large glass seals, and large contacts
- Internal cleanliness 100% verified by micro-particle analysis
- Each switch serialized and shipped with individual test data sheet
- Low contact resistance: 15 milliohms maximum
- Hermetically sealed & backfilled with dry Nitrogen & 10% Helium tracer
- Accommodation for 16 AWG and larger wires
|
Specifications for 270 Series Thermal Switches
|
|
PERFORMANCE
|
| Contact Arrangement: |
SPST |
| Contact Ratings: |
3 amps resistive load @ 55 VDC
|
| Endurance: |
100,000 cycles min. @ rated
load |
| Dielectric Withstanding Voltage:
|
1500 VAC RMS - terminals to case, 500 micro amperes maximum leakage |
| Insulation Resistance: |
1000 megohms min. @ 500 VDC - terminals to case |
|
ENVIRONMENTAL (MIL-STD-202)
|
| Vibration (Sine): |
Meth. 204, 15g 10Hz to 2000 Hz |
| Vibration (Random): |
Meth. 214, over 15.4g RMS |
| Ambient Temperature Range: |
-85°F to 400°F (-65°
to +204°C) |
| Moisture Resistance: |
Meth. 106, 240 hrs., 90-98% RH, & from +77° +149°F (+25°C to 65°C)
|
| Hermetic Seal: |
Meth. 112, Cond. C, Procedure IV, 1.0 x 10-8 Atm, cc/sec max leak rate |
| Solderability: |
Meth. 208 |
| Shock: |
Meth. 213, 100g/6ms, 750g/10ms |
| Thermal Shock: |
Meth.
107, Cond. B, -85 to +257°F (-65°C to 125°C) |
| Acceleration: |
Meth. 212, Cond. A, 30g |
| Salt Spray: |
Meth. 101, Cond. B, 48 hours
|
Acceptance Test Data for 270 Series Thermal Switches
|
| TEST |
CRITERIA |
| Contact resistance monitored burn-in |
500 cycles min., 50 milliohms max |
| Random vibration |
15g RMS |
| Particle impact noise detection (PIND) |
No particle noise |
| Calibration/setpoint |
3 cycles |
| Creepage (ARC) duration 3 cycles |
<5msec, 1250 VDC |
| Seal:
|
fine leak: <1 X 10-8
Atm. cc/sec
gross leak:
No bubbles |
| Contact resistance - 3 cycles
|
15 milliohms max (6 VDC. 0.1A) |
| Dielectric withstanding voltage - Terminals to case
|
1250 VAC RMS - terminals to case, 60 Hz |
| Insulation Resistance - Terminals to case |
500 megohms min. @ 500 VDC |
| Weight |
Varies by configuration |
| Inspection of product |
Final visual |
|
