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MP240D2 Datasheet(PDF) 16 Page - Opto Electronics Co,. LTD |
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MP240D2 Datasheet(HTML) 16 Page - Opto Electronics Co,. LTD |
16 / 23 page ![]() Solid-State Relays Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com © 2006–2014 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations. PAGE 16 Sample Calculation 2 240-volt,18-amp load, 25 °C ambient air temperature Model: 240D45 See the last two columns of the table on page 4 for thermal resistance and dissipation values for the 240D45. Also, see the note at the bottom of the table. Dissipation: 0.9 watts/amp Thermal resistance: 0.67 °C/watt Maximum junction temperature: 110 °C The calculation would be as follows: Duty Cycle Calculation When solid-state relays are operated in an on/off mode, it may be advantageous to calculate the RMS value of the current through the SSR for heat sinking or determining the proper current rating of the SSR for the given application. This calculation indicates that you should select a heat sink with a thermal resistance of less than 4.6 °C/watt. IRMS = RMS value of load or SSR T1 = Time current is on T2 = Time current is off ION = RMS value of load current during on period I RMS = T1 + T2 (ION) 2 x T 1 |
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