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Thermostat
Klixon 4344 Series
 
 
 
 
 
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Common Applications of the 4344 Precision Thermostat
- Motor Protection
Designed for single- and three–phase motors. Protects against overheating on all running conditions including: running overloads, increased ambient temperature, blocked motor ventilation, line voltage fluctuation
- Water Temperature Control
- Battery Packs
- Medical Equipment
- Dental Equipment

Motor Protection
As a motor winding thermostat, the Klixon 4344 can be mounted conveniently on the end turns of the motor windings. The small size and variety of available brackets afford flexibility in the method of attaching the thermostat. The hermetic construction allows the thermostat to withstand dipping and baking operations on the windings.

Automatic and Manual Reset
Automatic or manual reset systems may be obtained using these thermostats with either manual or automatic type motor starters. When more than one motor winding thermostat is used, they should be connected in series so that the opening of any one thermostat will actuate the controller and shut down the motor.

Site Updated September 19, 2017

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

Klixon® 4344 Series Thermostats
-65°F to 550°F Welded, Hermetically Sealed ½"


Hermetically sealed, high quality
Snap–action switching
Single pole, single throw (SPST)
Normally open or normally closed
Pre–set, non–adjustable calibration
Max resistive load: 7 amp
Operating temperature range: -65°F to 550°F (-54°C to 288°C)
Ambient temperature range: -80°F to 550°F (-62°C to 288°C)
Plating: standard is copper–nickel plated with silver contacts (other platings available)
Many options available including switch packaged into probe, strap mount, or immersion thermostat
Underwriters Labs (UL) (UL File #34618)
Canadian-UL (UL File #34618)

The Klixon® 4344 precision thermostat is constructed with a snap–acting bimetal disc, which serves as the actuating element. As the temperature reaches a pre–determined calibration point, the disc snaps to its reverse curvature producing a crisp, positive switching action inherent to Klixon thermostats. This feature assures reliable, consistent operating temperature over long cycle life.

The 4344 thermostat is hermetically sealed, making it an ideal choice for harsh environments. For more information, download the 4344 data sheet (file format: PDF, file size: 700K) or see the page of free drawings available for download.

Underwriters Labs / Canadian Underwriters Labs Ratings for 4344 Thermostat Switch
Agency
Max. Voltage
Max. Current
Non–inductive
Wattage
Max. Temp.
Cycles
Notes
UL
110-600 VAC  
720 VA
392 °F
10,000
Break, but not make, ungrounded cup *
* At this rating, suitable as a control circuit temperature limiting device for temperature protection of enclosures for hazardous locations motors and generators
UL
600 VAC
 
360 VA
392°F
10,000
Make and break, ungrounded cup
UL
24 - 240 VAC
 
125 VA pilot duty
392°F
10,000
Make and break, grounded or ungrounded cup
UL
120 VAC
2.5 A
 
450°F
100,000
Break and make, ungrounded cup
UL–C
120 VAC
2.5 A
 
450°F
100,000
 Break and make, ungrounded cup

Performance

The standard 4344 utilizes silver contacts. Gold plated contacts can be furnished to assure reliable circuit switching under low wattage conditions. (See second table below.)

Contact Ratings (Resistive) Based on standard differential
30 VAC/DC
125 VAC
250 VAC
Life Cycles
5.0 Amps
2.5 Amps
1.0 Amps
100,000 cycles
5.5 Amps
3.0 Amps
1.5 Amps
50,000 cycles
6.0 Amps
4.0 Amps
2.0 Amps
25,000 cycles
6.5 Amps
5.0 Amps
2.5 Amps
10,000 cycles
7.0 Amps
6.0 Amps
3.0 Amps
5,000 cycles

Gold Contact Ratings (Resistive)
30 VAC/DC
500 mA and below
115 VAC
200 mA and below
230 VAC
100 mA and below
Note: Gold plated contacts not suitable for higher loads. Other contact material may be appropriate for certain applications. Contact Sensata Technologies for additional application support.

Characteristics
Switch Action
SPST (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
Vibration Resistance
5–2000 Hz, 20G, per MIL-STD-202, Method 204 Condition D (unmonitored) (For high vibration applications, refer to the M1)
Shock Resistance
100G, 6 milliseconds, per MIL-STD-202, Method 213
Hermeticity
1 X 10-5 atm cc/sec maximum, per MIL-STD-202, Method 112, Condition D
Salt Spray Resistance
Per MIL-STD-202, Method 101, Condition B, 5% solution
Weight

Old  design (plated carbon steel construction)
 Basic Unit:  4.8 grams
 With bracket:  5.9 grams
New design (unplated stainless steel construction)
 Basic Unit:  7.0 grams
 With bracket:  8.0 grams

Electrical Ratings
720 VA, 110–600 VAC, break but not make, ungrounded cup
(At this rating, suitable as a control circuit, temperature limiting device for hazardous location motors and generators.)
360 VA, 600 VAC, make and break, ungrounded cup
125 VA Pilot Duty, 24–240 VAC, make and break, grounded or ungrounded cup
The line terminal is marked for grounded AC line voltage applications
Ambient Temperature Range
-80°F to 550°F (-62.2°C to 287.8°C)
Maximum ambient exposure while in the closed contact position is 200°F above contact closing temperature.

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
5
2.8
10
-12.2
20
11.1
5
2.8
20
-6.7
20
11.1
5
2.8
30
-1.1
20
11.1
5
2.8
40
4.4
20
11.1
5
2.8
Operating Temp.
Differential
Tolerance *
°F
°C
°F
°C
±°F
±°C
50
10.0
20
11.1
5
2.8
60
15.6
20
11.1
5
2.8
70
21.1
20
11.1
5
2.8
80
26.7
20
11.1
5
2.8
90
32.2
20
11.1
5
2.8
100
37.8
20
11.1
5
2.8
110
43.3
20
11.1
5
2.8
120
48.9
20
11.1
5
2.8
Operating Temp.
Differential
Tolerance *
°F
°C
°F
°C
±°F
±°C
130
54.4
20
11.1
5
2.8
140
60.0
20
11.1
5
2.8
150
65.6
20
11.1
5
2.8
160
71.1
20
11.1
5
2.8
170
76.7
20
11.1
5
2.8
180
82.2
20
11.1
5
2.8
190
87.8
20
11.1
5
2.8
200
93.3
20
11.1
5
2.8
Operating Temp.
Differential
Tolerance *
°F
°C
°F
°C
±°F
±°C
210
98.9
30
16.7
8
4.4
220
104.4
30
16.7
8
4.4
230
110.0
30
16.7
8
4.4
240
115.6
30
16.7
8
4.4
250
121.1
30
16.7
8
4.4
260
126.7
30
16.7
8
4.4
270
132.2
30
16.7
8
4.4
280
137.8
30
16.7
8
4.4
Operating Temp.
Differential
Tolerance *
°F
°C
°F
°C
±°F
±°C
290
143.3
30
16.7
8
4.4
300
148.9
30
16.7
8
4.4
310
154.4
40
22.2
12
6.7
320
160.0
40
22.2
12
6.7
330
165.6
40
22.2
12
6.7
340
171.1
40
22.2
12
6.7
350
176.7
40
22.2
12
6.7
375
190.6
40
22.2
12
6.7
Operating Temp.
Differential
Tolerance *
°F
°C
°F
°C
±°F
±°C
400
204.4
40
22.2
12
6.7
425
218.3
40
22.2
12
6.7
450
232.2
40
22.2
12
6.7
475
246.1
70
38.9
25
13.9
500
260.0
70
38.9
25
13.9
525
273.9
70
38.9
25
13.9
550
287.8
70
38.9
25
13.9
* NOTE: Additional ± 3°F tolerance is required for overmolded devices.
Consult Sensata Technologies if desired operating temperature does not appear on table.

Configurations

Our most common configurations are depicted below, but many other styles are available. The 4344 can be custom packaged to meet your specific design requirements.

Configuration Options - Custom configurations are available
Terminals
Heat–resistant rubber, neoprene, silicone rubber
Teflon in #18 gauge stranded wire in standard incremental lengths of 4" to 36". (Teflon is a Trademark of E. I. Dupont de Namers and Co.)
Other gauges and lengths available upon request.

See Also: Information is available in printable form by downloading the data sheet (file format: PDF, file size: 700K). Or see the page of 4344 drawings available for download, contact us, contact a distributor, or make an online request for additional information.
* * *
Klixon
Precision Thermostats

Precision Thermostats and Clamp

Qualifications
UL and Canadian-UL



Precision Thermostats


Drawing

Drawing

Drawing
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