Fast response overload protection relay - uses logic circuits which discriminate between faults and switching surgesThe circuit is for use in power system protection, and relies on the fact that switching surges decay very rapidly although their peak value may be the same as that for a fault. ...
Our invention relates to thermostatic overload relays for the protection of electric circuits and devices and involves improvements over the thermostatic relay disclosed in United States Patent No. 2,195,012 issued March 26, 1940, to Lawrence Pierce. An object of the invention is to facilitate.....
Overload protection circuit for voltage regulator IC In the circuit, IC3-7812 as the 12 volts regulator will supply voltage to load,through the contact C-NC of the relay RY1. In normal,the point A will has state is “1”, cause the output of IC1/1 is “0”, so no current to tri...
Switch-off protection circuit for LED lamps The switch-off protection circuit is suitable for most of series LED circuits of various street lamps, LED lamp tubes and the like and has the effect ... 沈汉鑫,叶敏杰 被引量: 0发表: 2014年 ...
Provides optimum protection of the loads and operating personnel in the event of short circuits due to insulation faults or faulty switching operations Electrical and mechanical matching to 3RT contactors ✓ ✓ ✓ Simplifies configuration Reduces wiring overhead and costs Enables stand-alone instal...
Overload protection circuit for a motor 1,031,452. Controlled rectifier switching circuits. JOSEPH LUCAS (INDUSTRIES) Ltd. Aug. 29, 1962 [Sept. 6, 1961], No. 31976/61. Heading H3T. [Also in Division H2] A D.C. overload protective arrangement comprises a gate-controlled switc... JONES...
The switch-position indicator incorporates a TEST function which, when activated, simulates a tripped overload relay by actuating both auxiliary contacts and displaying the switch position. 30 Electronic Overload Relays Electronic overload relays are another option for motor protection. The features and...
A very simple low battery cut-off and overload protection circuit has been explained here. The figure shows a very simple circuit set up which performs the function of an overload sensor and also as anunder voltage detector. In both the cases the circuit trips the relay for protecting the ...
running.Excesscurrentwillcausetheoverloadrelaytotripatapredeterminedlevel,openingthecircuitbetweenthepowersourceandthemotor.Afterapredeterminedamountoftime,theoverloadrelaycanbereset.Whenthecauseoftheoverloadhasbeenidenti edandcorrected,themotorcanberestarted.BimetalOverloadRelaysOverloadprotectioncanbeaccomplishedwith...
3) overload protective relay 过载保护继电器 1. Research on the electronic overload protective relay; 电子式过载保护继电器的研究 2. On the basis of research on the protection principle of overload protective relay, taking PIC16F877 single chip as core part, intelligent design for overload ...