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Technical Analysis Of Proper Use Of Relay
Nov 30, 2017

Technical analysis of proper use of relay

Rated working voltage of relay is one of the most important technical parameters of relay. When using the relay, the working voltage of the circuit (i.e., the circuit of the relay coil) should be considered first, and the rated working voltage of the relay should be equal to the working voltage of the circuit. The working voltage of the general circuit is 0.86 of the rated working voltage of the relay. Note that the work voltage of the circuit must not exceed the rated working voltage of the relay, otherwise the relay coil will burn easily.  In addition, some integrated circuits, such as the NE555 circuit can directly drive the relay to work, and some integrated circuits, such as the COMS circuit output current is small, need to add a level of transistor amplifier circuit can drive the relay, it should consider the transistor output current should be greater than the rated current of the appliance.


Selection of contact load


Contact load refers to the bearing capacity of contacts. The contact of the relay can withstand a certain voltage and current when it is switched.  Therefore, when using the relay, the voltage on the contact point and the current passing through the contact point can not exceed the contact load capacity of the relay. For example, there is a relay contact load of 28V (DC) x 10A, indicating that the relay contact can only work in the DC voltage of 28V circuit, the contact current is 10A, more than 28V or 10A, will affect the normal use of relays, and even burned contacts.


Selection of relay coil power supply


This refers to whether the relay coil uses direct current (DC) or alternating current (AC). Usually, the beginners use electronic circuit in the electronic production activities, and the electronic circuit often uses the DC power supply, so must use the coil is the direct current voltage relay.


Add: No.38 South Taoyuan Road, Yaozhuang Town,Jiashan County, Jiaxing City, Zhejiang Province, China
Contact person: Elva Zhuang&Sunny Ni
Tel:+86-573-84775555
Fax:+86-573-84776699
Phone:+86-13732570078
E-mail:sales9@great-relay.com
       sunny.ni@great-relay.com