1.6.9
Ek stock ko ek highway pe chalti car samjho. Ek circuit limit (jise price band bhi kehte hain) ek speed governor hai — yeh price ko ek hi din mein bahut zyada, bahut tezi se move karne se rokta hai. Agar sabhi panic karte hain (ya lalach mein aa jaate hain), toh price bahut wildly swing karti; exchange ek upar aur neeche ka "fence" lagata hai taaki trading ya toh ruk jaaye ya us fence ko us din cross hi na kar sake .
YEH KYU EXIST KARTA HAI: panic selling aur irrational buying ko rokne ke liye, insaanon ko sochne ka time dene ke liye, fat-finger errors aur manipulation ko prevent karne ke liye, aur retail investors ko single-day wipeout se bachane ke liye.
Definition Circuit limit / Price bandEk circuit limit ek regulator-set percentage boundary hai jo kisi stock ke previous-day closing price ke aas-paas hoti hai, jiske aage us din price trade karne allowed nahi hoti .
Upper Circuit (UC): aaj ki highest allowed price.Lower Circuit (LC): aaj ki lowest allowed price.Bands commonly 2%, 5%, 10%, ya 20% hote hain (India mein). Derivative-eligible (F&O) aur index-component stocks ke apne exchange-set price bands hote hain — lekin yeh typically wider (e.g. 20%) hote hain ya din ke dauran dynamically flex hote hain , aur yeh additionally market-wide index circuit breakers se bhi protected hote hain.
Definition Reference priceBand hamesha previous day's closing price se measure ki jaati hai (yeh reference price hai, ya nayi listing ke pehle din ke liye base price ).
Hum sirf ek base number ke around ek percentage window bana rahe hain. Bas itna hi.
Definition Individual price band vs. Market-wide circuit breaker
Individual stock price band: ek stock par ±b% ki cap (e.g. ek small-cap par 5%, bahut se large-caps par 20%). Price iske aage trade nahi kar sakti . Har stock — F&O aur index-component stocks bhi — ke paas aisi band hoti hai (chahe woh wide ho ya flexed ho).Market-wide index circuit breaker: index (Sensex/Nifty) ke 10%, 15%, ya 20% move hone par trigger hota hai. Yeh poore market mein trading ek set time ke liye band kar deta hai , phir (20% ke alawa) resume hoti hai.
Trigger
Timing
Effect
Index 10% move kare
1:00 pm se pehle
45-min halt
Index 10% move kare
1:00 pm–2:30 pm
15-min halt
Index 10% move kare
2:30 pm ke baad
koi halt nahi
Index 15% move kare
1:00 pm se pehle
1 ghanta 45 min halt
Index 15% move kare
1:00 pm–2:00 pm
45-min halt
Index 15% move kare
2:00 pm ke baad
baaki din ke liye trading band
Index 20% move kare
kisi bhi time
din bhar ke liye trading closed
Worked example 1 — Upper circuit, 10% bandStock kal P 0 = ₹200 b = 10% = 0.10 U C = 200 ( 1.10 ) = ₹220 , L C = 200 ( 0.90 ) = ₹180 lock ho jaati hai — koi seller kam mein sell nahi karna chahta, toh trades wahan freeze ho jaate hain.
Yeh step kyun? Kyunki UC par sirf buyers hote hain, koi sellers nahi — price aage nahi badh sakti aur rarely trade hoti hai.
Worked example 2 — Buri news ke baad lower circuitP 0 = ₹1000 b = 5% L C = 1000 ( 0.95 ) = ₹950 LC par lock ho jaati hai .
Yeh step kyun? LC par sellers hote hain, koi buyers nahi ; tum stock hold karte hua stuck reh sakte ho, exit nahi kar sakte — yeh illiquid circuits ka key risk hai.
Worked example 3 — Multi-day compoundingEk stock P 0 = ₹100 lagataar teen din 5% upper circuit lagaata hai.
100 → 105 → 110.25 → 115.7625
Yeh step kyun? Har din band naye close par reset hoti hai, toh gains compound hote hain : 100 ( 1.05 ) 3 = ₹115.76
Common mistake "Upper circuit = guaranteed profit, khareedo!"Kyun sahi lagta hai: stock tezi se upar ja raha hai; FOMO kehta hai jump in karo. Trap: UC par koi sellers nahi hote, toh tum often khareed bhi nahi sakte — aur agar kharida (kal ke gap pe), toh agla din lower circuit hit kar sakta hai, tumhe trap karke. Fix: circuits demand imbalance dikhate hain, value nahi. Kabhi locked circuits ke peeche mat bhaago.
Common mistake "Lower circuit matlab maine aaj sirf itna % hi khoya."Kyun sahi lagta hai: band aaj ki drop ko, maan lo, 5% tak cap karta hai. Trap: yeh kal bhi LC hit kar sakta hai, aur uske agle din bhi — losses compound hote hain 100 ( 0.95 ) n tum sell nahi kar sakte (koi buyers nahi). Fix: ek locked LC ek illiquidity trap hai, tumhari loss ka floor nahi.
Common mistake "F&O aur index stocks mein koi price band nahi hoti."Kyun sahi lagta hai: tum un stocks ko circuit lock karte rarely dekhte ho, toh lagta hai koi band hi nahi hai. Trap: unke paas exchange-set individual bands hoti hain — bas wider (often 20%) aur kabhi kabhi intraday flexed hoti hain, toh woh unhe rarely hit karti hain. Fix: kabhi yeh mat maano "koi band nahi hai"; exchange par specific stock ki applicable band check karo.
previous close ki bajay aaj ke open se measure karna.
Kyun sahi lagta hai: open pehli price hoti hai jo tum dekhte ho. Trap: reference kal ka close P 0 Fix: hamesha previous close ko anchor maano.
Recall Khud test karo (answers chupaao)
Band kis price se measure ki jaati hai? → previous day's closing price
Upper circuit ka formula? → U C = P 0 ( 1 + b )
Upper circuit par order book se kaun absent hota hai? → sellers
Kya F&O / index stocks ke individual price bands hote hain? → Haan , exchange-set (usually wider, e.g. 20%, kabhi kabhi intraday flexed).
Agar index 2:00 pm ke baad 15% move kare toh kya hoga? → rest of the day ke liye trading halt ho jaati hai.
Price band aur market-wide circuit breaker mein fark? → band = ek stock ki daily move cap; breaker = index ke 10/15/20% move par poora market halt.
₹100 se 3 din +5% circuit ke baad? → ₹115.76
Recall Feynman: 12-saal ke bachche ko samjhaoEk stock ki price ek kamre mein uchalti ball ki tarah hai. Normally yeh azaadi se uchhalti hai. Lekin agar yeh ceiling se takraane lage (bahut zyada buyers) ya floor se (bahut zyada sellers), toh referee kehta hai: "RUKO — aaj tumne wall hit kar li, iske aage koi uchhal nahi." Woh wall circuit limit hai. Yeh sabko shant hone ka mauka deta hai taaki koi ek din mein crazy price swing se crush na ho. Kal walls naye spots par shift ho jaati hain based on jahan ball aaj end hua.
Mnemonic Directions yaad karo"U-P = plUs, LoW = LOWer." Upper circuit ( 1 + b ) ( 1 − b ) "Top par koi Seller nahi, Bottom par koi Buyer nahi."
Order Types & Mechanics Market vs Limit Orders — band edge par limit order tab queue mein wait karta hai jab locked ho.Liquidity & Bid-Ask Spread — circuits extreme illiquidity events hain.Volatility & Risk Management Market-wide Circuit Breakers Previous Close & Reference Price
Circuit limit / price band kya hota hai? Ek regulator-set % boundary (e.g. 2/5/10/20%) previous close ke aas-paas, jiske aage stock us din trade nahi kar sakta.
Band kis price se measure ki jaati hai? Previous day ki closing price (reference/base price).
Upper circuit price ka formula? UC = P0 × (1 + b), jahaan b band fraction hai.
Lower circuit price ka formula? LC = P0 × (1 − b).
Total tradable band width? 2·b·P0 (base price ke percentage ka do guna).
Upper circuit par order book se kaun absent hota hai? Sellers — sirf buyers bachte hain, toh price aage rarely trade hoti hai.
Lower circuit par kaun absent hota hai? Buyers — tum sell karne mein unable ho sakte ho (illiquidity trap).
Kya F&O aur index-component stocks ke individual price bands hote hain? Haan — exchange-set, usually wider (e.g. 20%) aur kabhi kabhi intraday flexed; yeh exempt NAHI hain.
Fark: individual price band vs market-wide circuit breaker? Price band ek stock ki daily move cap karta hai; market-wide breaker poora MARKET halt karta hai jab index 10/15/20% move kare.
Agar index 2:00 pm ke baad 15% breach kare toh kya hoga? Baaki din ke liye trading halt ho jaati hai.
Circuit limits kyun exist karte hain? Panic selling/irrational buying rokne ke liye, fat-finger errors aur manipulation prevent karne ke liye, aur investors ko single-day wipeouts se bachane ke liye.
₹100 par stock 3 din +5% circuit lagaaye, final price? 100×(1.05)^3 = ₹115.76 (gains har din naye close par compound hote hain).
Agar close ₹500 ho aur price ₹525 par lock ho, toh band kya hai? b = (525−500)/500 = 5%.
triggered by index
Reference price P0
Circuit limit /
Curb panic and
Market-wide
