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Part #G311P641/05

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Features

  • Single pole/single throw (SPST) bi-metallic snap disc design
  • Preset temperature set points, non-adjustable calibration
  • Vacuum backed and back-filled with dry nitrogen atmosphere
  • Hermetically sealed to maximum leak rate of 1x10^-8 cc He/second
  • Qualified to MIL-PRF-24236/1
  • 100% screened to NASA S-311-P641

Applications

  • Battery systems
  • Propulsion lines, thrusters, & rocket motors
  • Optics, instrumentation, & electronic modules
  • Hydraulic/pneumatic actuators
  • Cold plates
  • Electric motor pre-heaters & robotic arm controls

Specifications

Storage temperature range -80°F to 550°F (-62.2°C to +287.8°C)
Maximum ambient exposure while in the closed position is 200°F above contact closing temperature.
Operating temperature range -55°F to 550°F (-48.3°C to +287.8°C)
Contact resistance 0.025 ohms maximum per MIL-STD-202, Method 307
Dielectric Withstanding Voltage 1250 VAC, rms, 60 Hz for 1 minute, terminal to case, per MIL-STD-202, Method 301
Vibration 5-2000 Hz, 20 G, per MIL-STD-202, Method 204, Cond. D (monitored)
5-1000 Hz, 100G, per MIL-STD-202, Method 204, Cond. D (unmonitored)
1000-2000, 50G, per MIL-STD-202, Method 204, Cond. D (unmonitored)
Shock 100G, 6 milliseconds, per MIL-STD-202, Method 213
Seal, Hermetic 1 X 10-8 atm cc/sec maximum, per MIL-STD-202, Method 112, Cond. C
Salt spray resistance Per MIL-STD-202, Method 101, Condition B, 5% solution
Moisture resistance Per MIL-STD-202, Method 106
Weight (avg) 4.8 grams basic unit; 5.9 grams with bracket
Finish 0.0003 - 0.0004 inches Ni per AMS-QQN-290 over 0.0002 - 0.0003 inches Cu per MIL-C-14550
Wire Leads Wire Lead Material per Table 4
Qualification Thermostat design on MIL-PRF-24236/1 Qualified Product Listing
Screening

Switches shall be subjected to 100% Group A screening inspection per S-311-641, Table I, Test Nos. 1-12, with the following details and exceptions:

  1. PIND per manufacturer’s GSFC approved internal test procedures; for PIND testing at temperatures below 0°F, consult factory.
  2. Creepage testing shall be performed in accordance with MIL-PRF-24236, para. 4.6.4 for three (3) consecutive cycles.
    1. Switches shall be heated or cooled as required to cause thermal actuation. The rate of temperature change of the switch shall be the minimum practical to provide reliable creepage detection.
    2. Tested units shall meet the req
Operating Temperature Range °F [°C] Available Differential Range °F [°C]
Minimum Standard Maximum
-55 to -1
[-48.3 to -18.3]
25
[13.9 ]
30
[16.7]
80
[44.4]
0 to 200
[-17.7 to 93.3]
9
[5]
20
[11.1]
80
[40.4]
201 to 300
[93.8 to 148.8]
20
[11.1]
30
[16.7]
80
[44.4]
301 to 450
[149.4 to 232.2]
30
[16.7]
40
[22.2]
80
[44.4 ]
451 to 550
[232.7 to 287.7]
60
[33.3]
70
[38.9]
80
[44.4]
Operating Temperature Range °F [°C] Standard Set Point Tolerance °F [°C] Special Set Point Tolerance °F [°C]
Open Closed Open Closed
-55 to -1
[-48.3 to -18.3]
+/-10
[+/- 5.6]
+/-8
[+/-4.5]
+/-8
[+/-4.5]
+/-6
[+/-4.5]
0 to 200
[-17.7 to 93.3]
+/-5
[+/-2.8]
+/-5
[+/-2.8]
+/-3
[+/-1.7]
+/-3
[+/-1.7]
201 to 300
[93.8 to 148.8]
+/-8
[+/-4.5]
+/-6
[+/-3.3]
+/-7
[+/-3.9]
+/-5
[+/-2.8]
301 to 450
[149.4 to 232.2]
+/-12
[+/-6.7]
+/-12
[+/-6.7]
+/-10
[+/-5.6]
+/-10
[+/-5.6]
451 to 550
[232.7 to 287.7]
+/-25
[+/-13.9]
+/-25
[+/-13.9]
+/-22
[+/-12.2]
+/-22
[+/-12.2]
Contact Material Contact Rating, Resistive Load (Amperes) Life Cycles
30 VAC/VDC 125 VAC 250 VAC
Fine Silver 5.0 2.0 1.0 100,000
5.5 3.0 1.5 50,000
6.0 4.0 2.0 25,000
6.5 5.0 2.5 10,000
7.0 6.0 3.0 5,000
Gold plated Fine Silver 12 VDC, 0.5 A, rated to
levels as low as 30mVDC,
0.01A
0.2 A 0.1 A 100,000
Wire Lead Ordering Code Wire Type Strain Relief Type Lead Length +/-10%
Inch (mm)
A M22759/11-22 (black) M23053/5, Class 1 59.0
(1500)
B M22759/11-22 (black) STYCAST 2850FT
C M22759/33-22 (black) M23053/5, Class 1
D M22759/33-22 (black) STYCAST 2850FT
E M22759/43-22 (black) M23053/5, Class 1
F M22759/43-22 (black) STYCAST 2850FT
Tube Mount Adapter Size Ordering Code Tube Mount Adapter Diameter Inch (mm)
1 .256 +.010/-.000
(6.50 +.25/-.000)
2 .381 +.010/-.000
(9.68 +.25/-.000)
Tube Mount Adpater Orientation Ordering Code Tube Mount Adapter Mounting Angle (+/-10°)
1
(Terminal Orientation Parallel To The Tube Direction)
2 45°
3 90°
4 135°

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