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Thermostat
Klixon 5BT Series
 
 
 
 
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Common Applications of 5BT Precision Thermostat
- Data Processing Equipment
- Computers
- Electronic Equipment
- Communication Equipment
- Cooling Systems
- Heating Systems
- And More!

Construction
The single pole, double throw construction instantly switches loads from one terminal to the other. This is accomplished through the temperature sensitive, actuating element — a snap–action, bimetal disc. This in turn activates a snap–acting switching mechanism. As the temperature reaches a predetermined point, the disc snaps to its reverse curvature, producing the crisp, positive switching action inherent to Klixon thermostats. This feature assures reliable, consistent operating temperatures over long cycle life with a minimum of electromagnetic interference.

Site Updated September 19, 2017

* * * Sensata > Products > Klixon Brand > Thermostats > Precision Thermostats >

Klixon® 5BT Series Thermostats
-65°F to 400°F, SPDT, Welded, Hermetically Sealed ½"


Single pole, double throw (SPDT)
Hermetically sealed
Vacuum baked and back–filled with nitrogen
High resistance to shock and vibration
Preset, non–adjustable calibration
Qualified to MIL-PRF-24236 /24

The Klixon 5BT series thermostat is a high reliability, hermetically sealed thermal switch. The single pole, double throw design allows versatility and economy in providing two functions within the same device. Typically these Klixon switches are used to control and indicate at a preset temperature. One pole can control a cooling fan and the other pole can indicate impending danger.

The 5BT thermostat is the ideal choice where quality and reliability in a double throw device are critical. For more information, see the page of drawings available.

Performance

Contact Ratings (Resistive) Based on standard differential
30 VAC/DC / 125 VAC
Life Cycles
2.0 Amps
100,000 cycles
3.0 Amps
50,000 cycles

Characteristics
Switch Action
SPDT (snap–action)
Contact Resistance
0.050 ohms maximum per MIL-STD-202, Method 307
Dielectric Strength
1250 VAC, rms, 60 cycles for 1 minute, terminal to case per MIL-STD-202, Method 301
Insulation Resistance
100 megohms min. at 500 VDC
Vibration Resistance
10-2000 Hz, 10G, per MIL-STD-202, Method 204, Condition D
Shock Resistance
60G, 11 milliseconds, per MIL-STD-202, Method 213
Acceleration
60G
Hermeticity
1 X 10-8 atm cc/second maximum per MIL-STD-202, Method 112, Condition C
Salt Spray Resistance
Per MIL-STD-202, Method 101, Condition B, 5% solution
Humidity
MIL-STD-202, Method 103, Condition A
Sand and Dust
MIL-STD-202, Method 110, Condition A
Weight (average)
Basic Unit: 6.0 grams
With bracket: 7.0 grams
Ambient Temperature Range
-65°F to 450°F, (-53.9°C to +232.2°C)
Maximum ambient exposure while in the closed position is 200°F above contact closing temperature.
Operating Temperature Range
-65°F to 400°F, (-53.9°C to +204.4°C)

Operating
Temperature
Differential
Tolerance
°F
°C
°F
°C
±°F
±°C
-65
-53.9
30
16.7
10
5.6
-40
-40.0
30
16.7
10
5.6
-15
-26.1
30
16.7
10
5.6
0
-17.8
20
11.1
8
4.4
10
-12.2
20
11.1
8
4.4
20
-6.7
20
11.1
8
4.4
30
-1.1
20
11.1
8
4.4
40
4.4
20
11.1
8
4.4
Operat. Temp.
Differential
Tolerance
°F
°C
°F
°C
±°F
±°C
50
10.0
20
11.1
8
4.4
60
15.6
20
11.1
8
4.4
70
21.1
20
11.1
8
4.4
80
26.7
20
11.1
8
4.4
90
32.2
20
11.1
8
4.4
100
37.8
20
11.1
8
4.4
110
43.3
20
11.1
8
4.4
120
48.9
20
11.1
8
4.4
Operat. Temp.
Differential
Tolerance
°F
°C
°F
°C
±°F
±°C
130
54.4
20
11.1
8
4.4
140
60.0
20
11.1
8
4.4
150
65.6
20
11.1
8
4.4
160
71.1
20
11.1
8
4.4
170
76.7
20
11.1
8
4.4
180
82.2
20
11.1
8
4.4
190
87.8
20
11.1
8
4.4
200
93.3
20
11.1
8
4.4
Operat. Temp.
Differential
Tolerance
°F
°C
°F
°C
±°F
±°C
210
98.9
20
11.1
8
4.4
220
104.4
20
11.1
8
4.4
230
110.0
20
11.1
8
4.4
240
115.6
20
11.1
8
4.4
250
121.1
20
11.1
8
4.4
260
126.7
20
11.1
8
4.4
270
132.2
20
11.1
8
4.4
280
137.8
20
11.1
8
4.4
Operat. Temp.
Differential
Tolerance
°F
°C
°F
°C
±°F
±°C
290
143.3
20
11.1
8
4.4
300
148.9
20
11.1
8
4.4
310
154.4
25
13.9
10
5.6
320
160.0
25
13.9
10
5.6
330
165.6
25
13.9
10
5.6
340
171.1
25
13.9
10
5.6
350
176.7
25
13.9
10
5.6
375
190.6
35
19.4
12
6.7
400
204.4
35
19.4
12
6.7
Consult Sensata Technologies if desired operating temperature does not appear on table.

Configurations

The switches are offered in several versions. Our most common configurations are depicted below, but many other styles are available.

Configuration Options - Custom configurations are available
Terminals
Flattened and Pierced (Flattened and pierced terminals can also be bent at right angles to reduce the overall height.)
Pin-type (Leads can be welded to pin-type terminals to form an integral unit.)
Wire Leads
Standard 18 gauge, stranded wire leads are available in white or black Teflon insulation, in accordance with MIL-W-22759/11 (Teflon is a Trademark of E. I. Dupont de Namers and Co.)
Other wires are available upon request. (Wire leads are not available for all styles.)
Finish
The standard plating is copper–nickel, but several other finishes are available.
Mounting Flanges
Top or bottom mounting flanges are available
Custom Designs
The 5BT device can be custom designed, such as packaging it into a probe thermostat.

For more information, see the page of 5BT drawings available for download, contact us, contact a distributor, or make an online request for additional information.

Drawing
* * *
Klixon
Miniature Thermostats

Qualifications
MIL-PRF-24236/24

The World Depends on Sensors and Controls