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参数资料
| 型号： | XCA1M |
| 元件分类： | 功率/信号继电器 |
| 英文描述： | POWER/SIGNAL RELAY, SPDT, MOMENTARY, 0.03A (COIL), 48VDC (COIL), 1440mW (COIL), 10A (CONTACT), 28VDC (CONTACT), SOCKET MOUNT |
| 文件页数： | 10/14页 |
| 文件大小： | 2057K |
| 代理商： | XCA1M |
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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| XCA1R | POWER/SIGNAL RELAY, SPDT, MOMENTARY, 0.096A (COIL), 12VDC (COIL), 1152mW (COIL), 10A (CONTACT), 28VDC (CONTACT), SOCKET MOUNT |
| XCA1V | POWER/SIGNAL RELAY, SPDT, MOMENTARY, 0.3A (COIL), 6VDC (COIL), 1800mW (COIL), 10A (CONTACT), 28VDC (CONTACT), SOCKET MOUNT |
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| XCA2B | POWER/SIGNAL RELAY, SPDT, MOMENTARY, 0.096A (COIL), 12VDC (COIL), 1152mW (COIL), 10A (CONTACT), 28VDC (CONTACT), PANEL MOUNT |
| XCA2C | POWER/SIGNAL RELAY, SPDT, MOMENTARY, 0.3A (COIL), 6VDC (COIL), 1800mW (COIL), 10A (CONTACT), 28VDC (CONTACT), PANEL MOUNT |
相关代理商/技术参数 |
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| XCA405DN | 功能描述:板上安装压力/力传感器 3Vto16V 0psi to 5psi Transducer RoHS:否 制造商:Honeywell 工作压力:0 bar to 4 bar 压力类型:Gage 准确性:+ / - 0.25 % 输出类型:Digital 安装风格:Through Hole 工作电源电压:5 V 封装 / 箱体:SIP 端口类型:Dual Radial Barbed, Same sides |
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