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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. |
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Sensata > Products > Klixon Brand > Thermostats > Precision Thermostats >
Klixon® 4344 Series Thermostats
-65°F to 550°F Welded, Hermetically Sealed ½"
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Hermetically sealed, high quality |
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Snap–action switching |
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Single pole, single throw (SPST) |
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Normally open or normally closed |
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Pre–set, non–adjustable calibration |
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Max resistive load: 7 amp |
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Operating temperature range: -65°F to 550°F (-54°C to 288°C) |
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Ambient temperature range: -80°F to 550°F (-62°C to 288°C) |
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Plating: standard is copper–nickel plated with silver contacts (other platings available) |
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Many options available including switch packaged into probe, strap mount, or immersion thermostat |
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Underwriters Labs (UL) (UL File #34618) |
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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 |
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125 VA pilot duty |
392°F |
10,000 |
Make and break, grounded or ungrounded cup |
UL |
120 VAC |
2.5 A |
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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
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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. |
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