Polycab 10kA D-Curve SP MCB – Single Pole Miniature Circuit Breaker, 6 A to 63 A, IS/IEC 60898-1

The Polycab 10kA D-Curve SP MCB is a single pole (1 pole) miniature circuit breaker with a D tripping curve and 10 kA breaking capacity, made to IS/IEC 60898-1 for 240/415 V AC, 50 Hz. Polycab lists it in 8 ratings - 6, 10, 16, 20, 25, 32, 40 and 63 A - at MRP Rs 459 to Rs 729 per piece (polycab.com, October 2026).

Polycab India Limited is India's largest manufacturer of wires and cables, with 27 manufacturing facilities, 4,300+ authorised distributors, 2,00,000+ retailers and an export presence in 84 countries (polycab.com, October 2026). Its switchgear range covers MCBs, RCCBs, RCBOs, isolators, changeover switches, ACCLs and distribution boards. Jai Enterprises supplies Polycab MCBs from Bhilai and Raipur all over Chhattisgarh - Bhilai, Raipur, Durg, Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India.

Is this the right one for you?

Check these four things before you order:

• You are protecting one single-phase circuit from the distribution board (single pole).
• Your load suits a D curve: high-inrush loads (motors, transformers, welders).
• The prospective short-circuit current where the MCB is fitted does not exceed 10 kA.
• The rating you need is 6, 10, 16, 20, 25, 32, 40 or 63 A - the rating must suit the cable it protects.

At a glance

• MRP: Rs 459 - 729 per piece (polycab.com, October 2026, inclusive of taxes)
• Product: Polycab 10kA D-Curve SP MCB
• Type: single pole MCB, D curve, 10 kA
• Poles: SP - single pole (1 pole)
• Tripping curve: D
• Breaking capacity: 10 kA
• Ratings: 6, 10, 16, 20, 25, 32, 40 and 63 A
• Item codes: GMM301P001 to GMM301P008
• Standard: IS/IEC 60898-1
• Rated voltage: 240/415 V AC, 50 Hz
• Warranty: 7 years (as listed by Polycab)

Ratings, item codes and MRP

• 6 A: item code GMM301P001 - MRP Rs 459
• 10 A: item code GMM301P002 - MRP Rs 459
• 16 A: item code GMM301P003 - MRP Rs 459
• 20 A: item code GMM301P004 - MRP Rs 459
• 25 A: item code GMM301P005 - MRP Rs 459
• 32 A: item code GMM301P006 - MRP Rs 459
• 40 A: item code GMM301P007 - MRP Rs 706
• 63 A: item code GMM301P008 - MRP Rs 729
• MRP basis: MRPs as listed on polycab.com, October 2026, inclusive of taxes; the selling price is confirmed on enquiry

Why choose the Polycab 10kA D-Curve SP MCB

• Easy removal from the DIN rail
• Positive contact position indication - the handle shows whether the contacts are really open
• Finger-proof IP20 terminals
• Air-flow channels to keep the breaker cool
• Label holder to mark the circuit
• 7-year warranty listed by Polycab
• High-quality contact tips
• Large terminals that take copper or aluminium conductors
• Bi-connect terminals on both sides - busbar or cable
• Line-load reversibility - it can be fed from the top or the bottom
• 10 kA breaking capacity
• Polycab item code and MRP for every rating, so the order matches the drawing - GMM301P001 to GMM301P008

How to choose and fit it

Tripping curve. Under IS/IEC 60898-1, a B-curve MCB trips instantly at 3 to 5 times its rated current, a C-curve at 5 to 10 times and a D-curve at 10 to 20 times. This D-curve breaker trips instantly at 10 to 20 times its rating, which suits loads with a heavy switch-on surge - motors that start under load, transformers, welding sets and other equipment whose inrush would trip a B or C curve breaker.

When not to use a D curve. On ordinary lighting and socket circuits a D-curve breaker needs a much larger fault current to trip instantly, so a B or C curve is the usual choice there; use the D curve where the switch-on surge would trip a C-curve breaker.

Poles. A single pole MCB is used for a single-phase final circuit - it protects the phase conductor of one circuit leaving the distribution board. In the 10 kA D-curve range Polycab lists SP, DP, TP and FP.

Breaking capacity. 10 kA is the largest short-circuit current the breaker can safely interrupt. Choose a breaking capacity at least equal to the prospective fault current where it is fitted - your electrician or consultant checks this at the board.

Rating. Choose a rating above the running current of the load and within the current-carrying capacity of the cable it protects; for motors, also check the starting current against the curve and the motor maker's recommendation.

Mounting. It clips on a standard DIN rail inside a distribution board or MCB enclosure.

Where it is used

• single-phase motors, small transformers and other loads with a heavy switch-on surge
• machine circuits where a C-curve breaker trips on switch-on
• factories, workshops and plant rooms

Other Polycab 10 kA MCBs

• Polycab 10kA B-Curve SP MCB - 6 A to 40 A, MRP Rs 235 - 531
• Polycab 10kA C-Curve SP MCB - 0.5 A to 63 A, MRP Rs 248 - 633
• Polycab 10kA C-Curve SPN MCB - 6 A to 63 A, MRP Rs 855 - 1,392
• Polycab 10kA C-Curve DP MCB - 0.5 A to 63 A, MRP Rs 871 - 1,408
• Polycab 10kA C-Curve TP MCB - 0.5 A to 63 A, MRP Rs 1,410 - 2,179
• Polycab 10kA C-Curve TPN MCB - 6 A to 63 A, MRP Rs 1,862 - 2,690
• Polycab 10kA C-Curve FP MCB - 0.5 A to 63 A, MRP Rs 1,871 - 2,784
• Polycab 10kA D-Curve SP MCB (this page) - 6 A to 63 A, MRP Rs 459 - 729
• Polycab 10kA D-Curve DP MCB - 6 A to 63 A, MRP Rs 982 - 1,576
• Polycab 10kA D-Curve TP MCB - 6 A to 63 A, MRP Rs 1,588 - 2,311
• Polycab 10kA D-Curve FP MCB - 6 A to 63 A, MRP Rs 2,058 - 2,964

Related products

• Polycab 10kA C-Curve SP MCB - the same pole type and breaking capacity with the C curve
• Polycab DP RCCB 30 mA - adds earth-leakage protection, which an MCB does not give
• Polycab SPN double-door distribution board - to house the MCBs
• All Polycab switchgear

Frequently asked questions

What does "D curve" mean on an MCB?

It describes how quickly the breaker trips on a surge. Under IS/IEC 60898-1 a D-curve MCB trips instantly at 10 to 20 times its rated current, which suits high-inrush loads (motors, transformers, welders). B trips at 3 to 5 times, C at 5 to 10 times and D at 10 to 20 times the rating.

Which pole type do I need?

SP protects one single-phase circuit; SPN switches the neutral together with the phase; DP switches and protects phase and neutral of a single-phase supply; TP is for three-phase loads without neutral; TPN switches the neutral together with the three phases; FP switches all four poles of a three-phase supply with neutral and is the usual incomer of a TPN distribution board. This page is the single pole (SP) version; in the 10 kA D-curve range Polycab lists SP, DP, TP and FP.

Should I choose a 10 kA or a 6 kA MCB?

Choose a breaking capacity at least equal to the prospective short-circuit current at the board. 6 kA is common in homes; 10 kA is the safer choice for commercial buildings, boards close to the transformer and industrial supplies. Polycab makes the SP D-curve MCB in 10 kA only.

Do I still need an RCCB with an MCB?

Yes, for protection against electric shock and earth-leakage fires. An MCB protects against overload and short circuit only; an RCCB (or an RCBO, which combines both) detects current leaking to earth.

What is the MRP of the Polycab 32 A 10kA D-curve SP MCB?

Rs 459 per piece, item code GMM301P006 - the MRP listed on polycab.com in October 2026, inclusive of taxes. Call +91 9340081159 for the selling price and stock.

Where can I buy the Polycab 10kA D-Curve SP MCB in Chhattisgarh?

From Jai Enterprises, Bhilai and Raipur, which supplies Polycab switchgear all over Chhattisgarh - Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India. Call +91 9340081159 with the rating, quantity and delivery location and we will confirm the price, stock and lead time.

How to order

Supplied by Jai Enterprises, Bhilai and Raipur, to every district of Chhattisgarh and across India. Polycab lists the 10kA D-Curve SP MCB at MRP Rs 459 - 729 per piece (polycab.com, October 2026, inclusive of taxes). Call +91 9340081159 or send an enquiry from this page with the rating, the quantity (pieces) and the delivery location, and we will confirm the selling price, stock and lead time.