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3BT & 4BT SERIES
Introduction
0°F to 350°F, Tiny Stat™ Precision Thermostats
Klixon
®
Tiny Stats combine an impressive list of superlatives in a reliable, hermetically sealed, snap–acting Klixon
®
design. They are the smallest
envelope size ever developed — ideal for remote sensing applications in locations with severe space limitations. They are the lightest construction
available — perfect for applications where weight is an important consideration. They have an extremely fast response in order to permit early warning
of overheat conditions. The low mass internal components allow Tiny Stat precision thermostats to meet the most demanding shock and vibration
standards of MIL-PRF-24236.
Features
• Smallest snap–acting thermal switches ever made
• Extremely fast response
• Single pole, single throw (SPST)
• Normally open or closed
• Preset, non-adjustable calibration
• Hermetically sealed and back–filled with nitrogen
• Gold plated
• Various mounting configurations available
• Qualified to MIL-PRF-24236/13 (4BT) and MIL-PRF-24236/19 (3BT)
• Qualified to NASA S-311-641/06 (4BT) and NASA S-311-641/07
(3BT)
PERFORMANCE CHARACTERISTICS
Gold plated contacts can be furnished to assure reliable circuit switching under low wattage conditions. (See second table below.) Gold plated contacts
are not suitable for higher loads.
Contact Ratings (Resistive) Based on standard differential
115 VAC / 30 VDC
1.0 Amp
30 mVAC*
0.01 Amp
* Specify gold contacts.
30 mVDC*
0.01 Amp
Life Cycles
10,000
Page 1
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Gold Contact Ratings (Resistive)
30 VAC/DC
115 VAC
500 mA and below
200 mA and below
Characteristics
Switch Action
Contact Resistance
Dielectric Strength
Vibration Resistance
Shock Resistance
Hermeticity
Salt Spray Resistance
Weight
Ambient Temperature Range
SPST (snap–action)
0.050 ohms maximum (0.100 ohms maximum for close on rise devices with setpoints greater than 175°F)
per MIL-STD-202, Method 307
500 vac, RMS, 60 Hz for 5 seconds, across open contacts, per MIL-STD-202, Method 301
5–2000 Hz, 30 G, per MIL-STD-202, Method 204
Vibration resistance specification does not apply to devices that open on temperature rise while at
temperatures of 75°F or more below the opening temperature or to devices that close on temperature
rise while at temperatures of 75°F or more above the closing temperature.
100 G, 6 milliseconds per MIL-STD-202, Method 213
1 x 10-8 atm cc/sec. maximum, per MIL-STD-202, Method 112, Condition C
Per MIL-STD-202, Method 101, Condition B, 5% solution
Basic Unit: 0.2 to 0.9 grams
-80°F to 350°F (-62.2°C to 176.7°C)
Operating Temperature
Standard temp settings (dash 1 to 71) are shown in the temperature table below. Sensata can make thermostats to any custom set point temperature
within the specified operating temperature range. Contact factory for assistance with custom set point temperatures.
Dash
#
1
2
3
4
5
6
7
8
Dash
#
9
10
11
12
13
14
15
16
Operating Temperature
°F
0
5
10
15
20
25
30
35
°F
40
45
50
55
60
65
70
75
°C
-17.8
-15.0
-12.2
-9.4
-6.7
-3.9
-1.1
1.7
°C
4.4
7.2
10.0
12.8
15.6
18.3
21.1
23.9
°F
30
30
30
30
30
30
30
30
Differential
°F
30
30
30
30
30
30
30
30
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
Differential
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Operating Temperature
Page 2
Copyright © 2018 Sensata Technologies, Inc.
www.sensata.com
Operating Temperature (continued)
Dash
#
17
18
19
20
21
22
23
24
Dash
#
25
26
27
28
29
30
31
32
Dash
#
33
34
35
36
37
38
39
40
Dash
#
41
42
43
44
45
46
47
48
Operating Temperature
°F
80
85
90
95
100
105
110
115
°F
120
125
130
135
140
145
150
155
°F
160
165
170
175
180
185
190
195
°F
200
205
210
215
220
225
230
235
°C
26.7
29.4
32.2
35.0
37.8
40.6
43.3
46.1
°C
48.9
51.7
54.4
57.2
60.0
62.8
65.6
68.3
°C
71.1
73.9
76.7
79.4
82.2
85.0
87.8
90.6
°C
93.3
96.1
98.9
101.7
104.4
107.2
110.0
112.8
°F
30
30
30
30
30
30
30
30
Differential
°F
30
30
30
30
30
30
30
30
Differential
°F
30
30
30
30
30
30
30
30
Differential
°F
30
30
30
30
30
30
30
30
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Differential
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Operating Temperature
Operating Temperature
Operating Temperature
Page 3
Copyright © 2018 Sensata Technologies, Inc.
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Operating Temperature (continued)
Dash
#
49
50
51
52
53
54
55
56
Dash
#
57
58
59
60
61
62
63
64
Dash
#
65
66
67
68
69
70
71
Operating Temperature
°F
240
245
250
255
260
265
270
275
°F
280
285
290
295
300
305
310
315
°F
320
325
330
335
340
345
350
°C
115.6
118.3
121.1
123.9
126.7
129.4
132.2
135.0
°C
137.8
140.6
143.3
146.1
148.9
151.7
154.4
157.2
°C
160.0
162.8
165.6
168.3
171.1
173.9
176.7
°F
30
30
30
30
30
30
30
30
Differential
°F
30
30
30
30
30
30
30
30
Differential
°F
30
30
30
30
30
30
30
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Differential
°C
16.7
16.7
16.7
16.7
16.7
16.7
16.7
16.7
±°F
8
8
8
8
8
8
8
8
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Tolerance
±°C
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
Operating Temperature
Operating Temperature
Page 4
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CONFIGURATIONS
Pin-Type
Threaded Plug
Insulated Version
Low Profile
Other
For quick assembly to printed circuit boards (3BT-2 and 3BT-15)
For surface temperature sensing (3BT-3)
For applications where grounded case construction is not suitable (3BT-6)
For applications where an extremely low profile is critical (4BT-2)
Other styles are available
Our most common configurations are shown below, but other styles are available:
Page 5
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