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参数资料
| 型号： | XB4A |
| 元件分类： | 功率/信号继电器 |
| 英文描述： | POWER/SIGNAL RELAY, DPDT, MOMENTARY, 0.056A (COIL), 28VDC (COIL), 1568mW (COIL), 5A (CONTACT), 28VDC (CONTACT), SOCKET MOUNT |
| 文件页数： | 12/16页 |
| 文件大小： | 1015K |
| 代理商： | XB4A |
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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| XB2V | POWER/SIGNAL RELAY, DPDT, MOMENTARY, 0.3A (COIL), 6VDC (COIL), 1800mW (COIL), 5A (CONTACT), 28VDC (CONTACT), PANEL MOUNT |
| XB2R | POWER/SIGNAL RELAY, DPDT, MOMENTARY, 0.096A (COIL), 12VDC (COIL), 1152mW (COIL), 5A (CONTACT), 28VDC (CONTACT), PANEL MOUNT |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XB4A_1 | 制造商:OMRON 制造商全称:Omron Electronics LLC 功能描述:0.4-mm Pitch Board to FPC Connector |
| XB4A_11 | 制造商:OMRON 制造商全称:Omron Electronics LLC 功能描述:0.4-mm Pitch Board to FPC Connector |
| XB4A2435D | 制造商:Omron Electronic Components LLC 功能描述:CONN FPC 24POS PLUG .4MM SMD |
| XB4A-2435-D | 功能描述:FFC & FPC连接器 .4mm Pitch Board Plug 24 Pin RoHS:否 制造商:JAE Electronics 产品类型:Plugs 系列:HD 节距:0.5 mm 位置/触点数量:40 安装角: 安装风格:Cable 外壳材料:Plastic 触点材料:Copper Alloy 触点电镀:Gold 电压额定值:100 V per contact 电流额定值:0.24 A to 1 A |
| XB4A4035D | 制造商:Omron Electronic Components LLC 功能描述:CONN FPC 40POS PLUG .4MM SMT |
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