继电器电压与电流关系

GB/T 21711.1-2008基础机电继电器 第1部分:总则与安全要求
对应
[table=95%][tr][td]书号/标准号： [/td][td]GB/T 21711.1-2008 [/td][/tr][tr][td]<img file="http://www.cnsis.info/book/image/spacer.gif" onload="thumbImg(this)" alt="" />[/td][/tr][tr][td]中文标准名称/书名： [/td][td]基础机电继电器 第1部分:总则与安全要求 [/td][/tr][tr][td]<img file="http://www.cnsis.info/book/image/spacer.gif" onload="thumbImg(this)" alt="" />[/td][/tr][tr][td]英文标准名称： [/td][td][/td][/tr][tr][td]<img file="http://www.cnsis.info/book/image/spacer.gif" onload="thumbImg(this)" alt="" />[/td][/tr][tr][td]页数： [/td][td]48 [/td][/tr][tr][td]<img file="http://www.cnsis.info/book/image/spacer.gif" onload="thumbImg(this)" alt="" />[/td][/tr][tr][td]ICS分类号： [/td][td]29.120.701.220.99 [/td][/tr][tr][td]<img file="http://www.cnsis.info/book/image/spacer.gif" onload="thumbImg(this)" alt="" />[/td][/tr][tr][td]被替代标准号： [/td][td][/td][/tr][tr][td]<img file="http://www.cnsis.info/book/image/spacer.gif" onload="thumbImg(this)" alt="" />[/td][/tr][tr][td]采用标准： [/td][td]IEC 61810-1-2003,IDT [/td][/tr][tr][td]<img file="http://www.cnsis.info/book/image/spacer.gif" onload="thumbImg(this)" alt="" />[/td][/tr][tr][td]中标分类号： [/td][td]L25
5.2 Operative range
The operative range of a relay coil can be specified either according to 5.2.1 or 5.2.2.
5.2.1 The recommended operative range is to be specified according to one of two classes:
Class 1: 80 % to 110 % of the rated coil voltage (or range).
Class 2: 85 % to 110 % of the rated coil voltage (or range).
NOTE Where a rated coil voltage range applies, the operative range is from 80 % (or 85 %) of the lower limit to
110 % of the upper limit of the rated coil voltage range.
The above values apply over the full ambient temperature range as declared by the
manufacturer.
Where the manufacturer deviates from the recommended classes, he shall specify both the
rated coil voltage (or range) and the corresponding operative range, see Figure A.3.
5.2.2 As an alternative to the operative range specified in 5.2.1, the manufacturer may
graphically represent the operative range against ambient temperature. This is achieved by
describing the upper limit (U2 = limiting coil voltage) and the lower limit (U1 = operate voltage)
of the operative range, as illustrated by Figure A.3.
5.3 Release
The release values indicated below apply over the full ambient temperature range as declared
by the manufacturer.
a) DC relay
Where the operative range is specified according to 5.2.1, the release voltage of
monostable relays shall be not lower than 5 % of the rated coil voltage (or the upper limit
of the rated coil voltage range), see Figure A.3.
Where the operative range is specified according to 5.2.2, the release voltage of
monostable relays shall be not lower than 10 % of the lower limit U1 of the operative range,
see Figure A.3.
b) AC relay
The same conditions as for DC relays apply, except that a value of 15 % shall be used in
place of 5 % or 10 %, respectively.

是线圈还是触点啊，触点容量一定，电压和电流成反比

5楼说的很好，补充一点是：刚开始降低电压，电流都是会降的。到您说的仅仅是那个很小的特殊区段。实际上做个试验就很好验证整个过程中电压和电流的曲线对应关系，当然这是定性的，不同继电器和交直流继电器稍有不同。

4楼说的也有道理，继电器线圈电压降低，电流减小，如过在一定的范围内，会造成继电器抖动。电压升高，电流相应增大，大一定程度，线圈也会损坏。

1、继电器的电气参数有吸合电流（电压）、额定工作电流（电压）、释放电流（电压）等
2、继电器工作电压一般在一定的范围内都能保证继电器正常工作。
3、当电压低于额定工作电压太多时就无法吸合，所以我认为电压低时电流就小，但只要仍大于吸合电流继电器就会正常工作了。