P120D2 OPTO 22, P120D2 Datasheet - Page 16

• Manufacturer Part Number: P120D2
• Description: SSR, PCB MOUNT, 140VAC, 24VDC, 2A
• Manufacturer: OPTO 22

Specifications of P120D2

• Control Voltage Type: DC
• Input Voltage: 3VDC To 24VDC
• Load Current: 2A
• Load Voltage Range: 12VAC To 140VAC
• Switching Mode: Zero Cross
• Relay Terminals: Through Hole
• Load Voltage Max: 140VAC
• Brand/series: P Series
• Current, Rating: 2 A
• Function: General Purpose
• Relay Type: Solid State
• Voltage, Control: 120 VAC
• Control Voltage Max: 32V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
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.
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
© 2006–2011 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.
800-321-6786 • 951-695-3000 • FAX [phone] • [e-mail] •
I
T
T
I
RMS
ON
1
2
= Time current is on
= Time current is off
= RMS value of load current during on period
= RMS value of load or SSR
page 4
for thermal resistance and dissipation values for the 240D45. Also, see the note at
I
RMS
800-835-6786 • 951-695-3080 • FAX [phone] • [e-mail]
=
(I
This calculation indicates that you should
select a heat sink with a thermal resistance
of less than 4.6 °C/watt.
T
ON
1
)
+ T
2
x T
2
1
Solid-State Relays