參數(shù)資料
型號: TDH-7050-1000
元件分類: 延時繼電器
英文描述: ON-DELAY RELAY, 4PDT, MOMENTARY, 0.15A (COIL), 30VDC (COIL), 4500mW (COIL), 10A (CONTACT), 0.1s, SOCKET MOUNT
文件頁數(shù): 4/5頁
文件大小: 439K
代理商: TDH-7050-1000
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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相關PDF資料
PDF描述
TDH-7050-1001 ON-DELAY RELAY, 4PDT, MOMENTARY, 0.15A (COIL), 30VDC (COIL), 4500mW (COIL), 10A (CONTACT), 1s, SOCKET MOUNT
TDH-7050-2000 ON-DELAY RELAY, 4PDT, MOMENTARY, 0.15A (COIL), 30VDC (COIL), 4500mW (COIL), 10A (CONTACT), 0.2s, SOCKET MOUNT
TDH-7050-2002 ON-DELAY RELAY, 4PDT, MOMENTARY, 0.15A (COIL), 30VDC (COIL), 4500mW (COIL), 10A (CONTACT), 20s, SOCKET MOUNT
TDH-7050-2500 ON-DELAY RELAY, 4PDT, MOMENTARY, 0.15A (COIL), 30VDC (COIL), 4500mW (COIL), 10A (CONTACT), 0.25s, SOCKET MOUNT
TDH-7050-3603 ON-DELAY RELAY, 4PDT, MOMENTARY, 0.15A (COIL), 30VDC (COIL), 4500mW (COIL), 10A (CONTACT), 360s, SOCKET MOUNT
相關代理商/技術參數(shù)
參數(shù)描述
TDH-7050-1001 制造商:Leach International Corporation 功能描述:EM RLY 4PDT 10A 20/30VDC SCKT - Bulk
TDH-7050-2000 制造商:Leach International Corporation 功能描述:EM RLY 4PDT 10A 20/30VDC SCKT - Bulk
TDH-7050-2002 制造商:Leach International Corporation 功能描述:EM RLY 4PDT 10A 20/30VDC SCKT - Bulk
TDH-7050-2500 制造商:Leach International Corporation 功能描述:TIME DELAY - Bulk
TDH-7050-3001 制造商:Leach International Corporation 功能描述:TIME DELAY - Bulk