30R400

      The 30R400 is a 30V Radial Leaded Device with a 40A Short Circuit Rating.The 30R400 Resettable devices utilize a unique polymer-based,Positive Temperature Coefficient (PTC) material to protect electrical
circuits against overcurrent conditions.In normal operation, the 30R Series PTC has many conductive pathsand a very low resistance. In an overcurrent condition, the temperature of the polymer material rises. This dramatically reduces the conductive paths resulting in an immediate rise in resistance. In this condition, the device provides circuit protection by significantly limiting the flow of current. However, once the cause of the initial overcurrent condition is eliminated, the 30R Series PTC cools down and resets to a low resistance value permitting the normal current flow to resume.
      Here you can get some information about the 30R400. The lead solderability uses MIL-STD-202, Method 208E
The coating uses thermoset coating.Standard bulk packaging is 500 pieces per container.Optional tape and reel packaging per EIA 486-B is also available.
      Then is about the environmental specifications.Passive Aging: 85°C, 1000 Hours. ±5% typical resistance change;Humidity Aging: 85°C, 85% R.H., 1000 hours. ±5% typical resistance change;Thermal Shock: 85°C / 40°C, 20 times. ±10% typical resistance change;Vibration: MIL-STD 202, Method 201. No resistance change.The Max. Surface Temperature is 125°C.The Operating/Storage Temperature is 40°C to 85°C.
      The following is about the 30R400.The I_hold (Hold Current: maximum current device will sustain for 4 hours without tripping in 20°C still air.) is 4.00 A.The I_trip (Trip Current: minimum current at which the device will trip in 20°C still air.) is 8.00 A.The V_max (Maximum voltage device can withstand without damage at rated current (Imax)) is 30 V.The I_max (Maximum fault current device can withstand without damage at rated voltage (V_max)) is 40 A.The P_d (Power dissipated from device when in the tripped state at 20°C still air.) is 2.5 W.The R_IL (Minimum resistance of device in initial (un-soldered) state.) is 0.010 W.The R_AT (Maximum resistance of device at 20°C measured one hour after tripping.) is 0.05 W.The Maximum Time To Strip is 12.7 sec at the current is 20 A.