{"product_id":"over-current-trip-switch-over-current-shutdown-relay","title":"Over Current Trip Switch – Over Current Shutdown Relay","description":"\u003cp\u003eThis is an over-current trip switch. It provides protection to a load when over current condition occurs. Basically, the project trips the relay when there is a short circuit or the load starts drawing much current. When the condition is favorable, press the tactile switch to power the load again. The threshold voltage of the comparator is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0.6V,\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ethe over-current limit can be adjusted using the trimmer Potentiometer PR1. Operating supply\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e12V DC @ 80mA\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewhen the relay is ON, load supply\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0V to 48V\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe project is built using\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eINA202\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003echip from Texas Instruments. The INA202 chip includes the high-side current-shunt monitor with voltage output and an integrated comparator. The device measures current through the shunt resistor R1 with current flowing in one direction that enables detection of an overcurrent event only when the differential input voltage exceeds the threshold limit. When the current reaches the set limit of the divider R7\/ PR1, the output of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCMPOUT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003etransitions high, which turns Q1 on, pulls the base of the BJT transistor Q2 low which then switches OFF the relay, and turns the flow of the current OFF through relay contacts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTrip Current Threshold\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTrip current is adjustable from\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e250mA to 3A\u003c\/strong\u003e, PR1 trimmer potentiometer is provided to adjust the trip current, and load supply range is from\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0 to 48V\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis project can be used for higher current trip and higher Voltage load with a few changes. Please refer to Datasheet for more details.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eShunt Resistor R1 (Choose a lower value for higher current Trip), Maximum range 30A (Due to Relay Contacts Limit of 30A)\u003c\/li\u003e\n\u003cli\u003eR7 and PR1\/Optional R13 Resistor Divider (Trip Voltage Threshold), Internal Reference Threshold 0.6V\u003c\/li\u003e\n\u003cli\u003eFor Higher voltage up to 80V, Choose Capacitor C1 and C2 100V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"simple-alert-boxes sab_info sab_normal\"\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eSingle Supply operation is possible, if the load supply is 12V DC, tie VDD Pin to +DC for single Supply.\u003c\/div\u003e\n\u003ch3\u003eConnections and Other Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCN1: Load Supply Input 0 to 48V DC, Current Up to 5 Amps (Pin 1 = + DC Input, Pin 2 = GND)\u003c\/li\u003e\n\u003cli\u003eCN3: Load Connection (Pin 1 = + DC Output, Pin 2 = GND)\u003c\/li\u003e\n\u003cli\u003eCN2: Logic Supply 12V DC @ 80mA (Pin 1 = VDD, Pin 2 = VDD, Pin 3 = GND, Pin 4 = GND)\u003c\/li\u003e\n\u003cli\u003eLED D3: Power LED\u003c\/li\u003e\n\u003cli\u003eLED D2: Function LED (LED On = Relay Function)\u003c\/li\u003e\n\u003cli\u003eJumper J1: Latch or Non-Latch (Connect to VCC for Latch)\u003c\/li\u003e\n\u003cli\u003ePR1: Trip Current Adjust 250mA to 3Amps (Approx.)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOperating Supply 12V DC @ 80mA\u003c\/li\u003e\n\u003cli\u003eLoad Supply 0 to 48V DC (Higher Voltage up to 80V Possible Read Note)\u003c\/li\u003e\n\u003cli\u003eLoad Current Trip Range 250mA to 3Amps Approx.\u003c\/li\u003e\n\u003cli\u003ePower LED and Function LED\u003c\/li\u003e\n\u003cli\u003eScrew Terminals for Load Supply and Load\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Load Switch\u003c\/li\u003e\n\u003cli\u003eTrimmer Potentiometer for Trip Threshold Adjust\u003c\/li\u003e\n\u003cli\u003e4 x 4 mm Mounting Holes\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 71.12 x 37.94mm\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47193239486636,"sku":"D110","price":26.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/D110.jpg?v=1789214637","url":"https:\/\/dotfry.com\/products\/over-current-trip-switch-over-current-shutdown-relay","provider":"dotfry","version":"1.0","type":"link"}