This Klixon® snap–acting disc type control is designed to provide crisp, positive switching action. The 4391 is the most versatile of the Klixon® precision thermostats with its available SPST or SPDT switching, automatic or manual reset, and overmold options. The high current carrying capacity in a hermetic package make it ideal for applications such as aircraft galley equipment, aircraft lavatory hot water heaters, semiconductor equipment, and locomotive/railcar heaters.
| Dielectric Strength | 1250 VAC, rms, 60 cycles for 1 minute |
| Vibration Resistance | Standard Construction : 5–500 Hz, 3G High Vibration Construction : 5–500 Hz. 5G |
| Hermeticity | 1 X 10-5 atm cc/second maximum |
| Weight | Without overmold : 21 grams (average) With overmold : 56 grams (average) |
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