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PCH-I-50 Datasheet(PDF) 3 Page - Picker Components |
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PCH-I-50 Datasheet(HTML) 3 Page - Picker Components |
3 / 3 page 3220 Commander Drive, Suite 102 Carrollton, TX 75006 www.PickerComponents.com Sales: (972) 713-6272 (888) 997-3933 Fax: (972)735-0964 e-mail: sales@pickercomponents.com Dimensions are listed for reference purposes only. Specifications and Availability subject to change without notice. PCS86 6/05/15 3 of 2 Calculating SSR Heat Dissipation: TJ-TA=P x RJA RJA=RJC+RCA P=I x V Where: TJ is the junction temperature of the output semiconductor in °C, use 125°C for Triacs, SCRs & Mosfets, TA stands for the ambient temperature in °0 P is the power generated by the internal semiconductor in Watts, where I is the maximum output current of the SSR and V is the Forward Voltage of the semiconductor RJA stands for thermal resistance in °C/W from junction to ambient ignoring the thermal resistance from the SSR metal base to heat sink RJC stands for thermal resistance from junction to case – obtain from data sheet RCA stands for the thermal resistance from case to ambient. An example, PCS15-D-249A-20Z with a 10 Amp Load Current in free air: RJC is 1.2 °C/W (from data sheet), RCA 8.5 °C/W (free air heat dissipation), TJ is 125°C, I is 10 Amp load current, V is 1.1V (Forward Voltage drop of triac at 10 Amps), in formula: 125 – TA = (10 x 1.1) x (1.2 + 8.5) thus TA = 17.3°C or 63°F which is the maximum ambient temperature this relay will operate without a heat sink. Another way of looking at this, the maximum current the relay can handle at 25°C is 9.3 Amps Add a PCH-H-110 Heat Sink with its 1.1°C/W (RCA) Thermal Resistance with the same 10 Amp Load: 125 – TA = (10 x 1.1) x (1.2 + 1.1) thus TA = 99.7°C or 211°F which is the maximum ambient temperature this relay will operate with the PCH-H-110 heat sink. Also, the maxi- mum current the relay can handle at 25°C is 39.5 Amps (Go with the 40A version of the relay) |
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