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参数资料
| 型号： | YE2A |
| 元件分类： | 功率/信号继电器 |
| 英文描述： | POWER/SIGNAL RELAY, 4PDT, MOMENTARY, 0.07A (COIL), 28VDC (COIL), 1960mW (COIL), 5A (CONTACT), 28VDC (CONTACT), PANEL MOUNT |
| 文件页数： | 12/16页 |
| 文件大小： | 3319K |
| 代理商： | YE2A |
Application notes
N°101
DERATING OF CONTACTS FOR DC VOLTAGES
ABOVE NOMINAL RATING
To establish a standard for the derating of relay contacts is, at best, a subjective practice. Limitations are governed by the type
of relay, contact gap, maximum voltage capabilities of the relay contact system, and the contact material.
The most common method is to derate the contacts by use of the Power Formula, using the known current and voltage.
This method is valid only for Resistive Loads, and is an approximation only; keeping in mind the limitations mentioned above.
Power = IE (Current x Voltage)
I2 E2 = 2/3 I1E1
Example:
A designer is working with a 55 volt DC system and has a relay rated at 10 amps resistive at 28 volts DC.
What is the maximum current that can be switched at 55 Vdc.
I1 = 10 Amperes
E1 = 28 VDC
E2 = 55 VDC
I2 = ? (Current ratings at 55 VDC Resistive)
I2 E2 = 2 I1 E1/3
I2 = 2 I1 E1/E23
= 2 (10 x 28)/55 x 3
= 560/165
I2 = 3.4 Amperes at 55VDC
In addition, the user should always be concerned about the following:
1. Derating contacts that are rated for less than 10 Amperes at nominal voltage.
2. Derating contacts for use in system voltages above 130 Volts DC
Date of issue: 6/00
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| YE2B | POWER/SIGNAL RELAY, 4PDT, MOMENTARY, 0.12A (COIL), 12VDC (COIL), 1440mW (COIL), 5A (CONTACT), 28VDC (CONTACT), PANEL MOUNT |
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相关代理商/技术参数 |
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|---|---|
| YE-2R14-D6 | 制造商:Honeywell Sensing and Control 功能描述: |
| YE2RBA2 | 制造商:Honeywell Sensing and Control 功能描述:MICRO SWITCH, PLUNGER, SPST-NO, 25A 250V; Contact Configuration:SPST-NO; Microswitch Type:Standard; Actuator Style:Plunger; Switch Operation:-; Operating Force Max:22ozf; Contact Voltage AC Nom:250V; Contact Current Max:25A ;RoHS Compliant: Yes |
| YE-2RB-A2 | 功能描述:基本/快动开关 BASIC SW SPNO 25 A 250Vac Overtrav PLGR RoHS:否 制造商:Omron Electronics 触点形式:SPDT 执行器:Lever 电流额定值:5 A 电压额定值 AC:250 V 电压额定值 DC:30 V 功率额定值: 工作力:120 g IP 等级:IP 67 NEMA 额定值: 端接类型:Wire 安装:Panel |
| YE2RBA4 | 制造商:HONEYWELL 功能描述:Large Basics 制造商:Honeywell Sensing and Control 功能描述:Large Basics |
| YE-2RB-A4 | 功能描述:基本/快动开关 SP-NO CIR 20A 250Vac OVTR Pin Plung ACTR RoHS:否 制造商:Omron Electronics 触点形式:SPDT 执行器:Lever 电流额定值:5 A 电压额定值 AC:250 V 电压额定值 DC:30 V 功率额定值: 工作力:120 g IP 等级:IP 67 NEMA 额定值: 端接类型:Wire 安装:Panel |
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