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參數資料
| 型號： | 240A25 |
| 英文描述： | RELAY SOLID STATE 240V 25A |
| 中文描述： | 繼電器固態(tài)240伏25A條 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 315K |
| 代理商： | 240A25 |
Form 859-990514
SOLID-STATE RELAYS
DATA
SHEET
page 9/12
Opto 22 43044 Business Park Drive Temecula, CA 92590 Phone: (909)695-3000 (800)321-OPTO Fax: (909)695-3095 Internet: www.opto22.com
Inside Sales: (800)452-OPTO Product Support: (800)TEK-OPTO (909)695-3080 Fax: (909)695-3017 E-mail: support@opto22.com FaxBack: (800)474-OPTO
Heat Sink Calculation
Like all semiconductor devices, SSR current
ratings must be based on maximum junction
temperature. All Opto 22 SSRs operate
conservatively at maximum junction temperatures
of 110° C. Determining an adequate heat sink
for a given SSR conducting a given current is
very simple.
Note: Thermally conductive grease must be used
between the relay base and the heat sink.
Sample Calculation Given:
120-Volt, 20-Amp Load
50° C Ambient Air
Choose Model 120D25 SSR.
Calculate dissipation as:
20 amps x 1.3 Watts per amp = 26 Watts
Calculate temperature rise junction to SSR base as:
26 Watts x 1.2° C per Watt = 31.2° C
Calculate allowable temperature of heat sink by subtracting 31.2° C from 110° C allowable junction temperature:
110° C-31.2 = 78.8° C
The heat sink is in a 50°C ambient, therefore, allowable temperature rise on heat sink is:
78.8° C-50° C = 28.8° C
If heat sink is allowed to rise 28.8° C above ambient, then the thermal resistance of the heat sink is simply the 28.8° C rise divided by the 26
Watt. Any heat sink having a thermal resistance less than 1.1° C per Watt will be adequate.
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.
I
RMS
= RMS value of load or SSR
T
1
= Time current is on
T
2
= Time current is off
I
ON
= RMS value of load current during on period
I
RMS
=
(I
ON
)
T
1
+ T
2
2
x T
1
Tips
Applications
相關PDF資料 |
PDF描述 |
|---|---|
| 240D3 | RELAY SOLID STATE 240V 3A |
| 575D45-12 | RELAY SOLID STATE 575V 45A |
| 240NQ035 | 240 AMP SCHOTTKY RECTIFIER |
| 240NQ040 | 240 AMP SCHOTTKY RECTIFIER |
| 240NQ045 | 240 AMP SCHOTTKY RECTIFIER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 240A25 | 制造商:Opto 22 功能描述:Solid-State pwr Relay pwr ser Standard |
| 240A45 | 制造商:Opto 22 功能描述:Relay;SSR;Power;Cur-Rtg 45A;Vol-Rtg 240AC;Panel Mnt;UL, CSA, CE;AC Series 制造商:Opto 22 功能描述:SSR 45A 240VAC 制造商:Opto 22 功能描述:SSR, PANEL MOUNT, 280VAC, 280VAC, 45A; Operating Voltage Min:24VAC; Operating Voltage Max:280VAC; Control Voltage AC Min:280VAC; Control Voltage AC Max:85VAC; Contact Configuration:-; Load Current:45A; Switching Mode:Zero Crossing ;RoHS Compliant: Yes 制造商:Opto 22 功能描述:Relay SSR 280V AC-IN 45A 280V AC-OUT 4-Pin |
| 240A45 | 制造商:Opto 22 功能描述:SOLID STATE RELAY ((NW)) 制造商:Opto 22 功能描述:SSR, PANEL MOUNT, 280VAC, 280VAC, 45A |
| 240A45MSTB-5AMP | 制造商:Olympic Controls Corporation 功能描述:STB |
| 240AF30DF | 制造商:Olympic Controls Corporation 功能描述:DF |
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