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参数资料
| 型号： | TDH-6060-3002 |
| 元件分类： | 延时继电器 |
| 英文描述： | ON-DELAY RELAY, DPDT, MOMENTARY, 0.15A (COIL), 30VDC (COIL), 4500mW (COIL), 10A (CONTACT), 3-30s, SOCKET MOUNT |
| 文件页数： | 4/8页 |
| 文件大小： | 548K |
| 代理商： | TDH-6060-3002 |
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)
I
2
E
2
= 2/3 I
1
E
1
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.
I
1
= 10 Amperes
E
1
= 28 VDC
E
2
= 55 VDC
I
2
= (Current ratings at 55 VDC Resistive)
I
2
E
2
= 2 I
1
E
1
/3
I
2
= 2 I
1
E
1
/E
2
3
= 2 (10 x 28)/55 x 3
= 560/165
I
2
= 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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| TDH-6060-5000 | 制造商:Leach International Corporation 功能描述:EM RLY DPDT 10A 20/30VDC SCKT - Bulk |
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