EXORA MCB 25A SP 240V AC 10kA B Curve | L&T – BB10250B

Name: L&T BB10250B MCB 25A SP B Curve 10kA 240V AC
Brand: Lauritz Knudsen (L&T)
SKU: BB10250B
Price: 154.37 INR
Availability: InStock

SKU: BB10250B

Original price was: ₹359.00.Current price is: ₹154.37. Excl. GST

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Looking for the EXORA MCB 25A SP 240V AC 10kA B Curve | L&T? This genuine BB10250B miniature circuit breaker (mcb) is built for reliable circuit protection and isolation, combining proven reliability with full compliance to applicable IEC/IS standards. Key ratings include 25 A, 240V AC, 1 Pole. Order part number BB10250B from myelectric.in — a trusted BB10250B supplier offering competitive pricing, GST billing, and shipping across India and overseas.

📋 Technical Specifications

Parameter	Value
Brand	BB10250B
Part Number / SKU	BB10250B
Category	Miniature Circuit Breaker (MCB)
Current Rating	25 A
Voltage Rating	240V AC
Poles	1 Pole
Breaking Capacity	10 kA
Tripping Curve	Curve B
Rated Voltage	230/400V AC
Rated Frequency	50/60 Hz
Magnetic Trip Range	3–5 × In (per IEC 60898-1)
Trip Mechanism	Thermal-magnetic (bimetal overload + electromagnetic short-circuit)
Mounting	35mm DIN rail (EN 60715)
Width	18 mm (1 × 18mm modules)
Electrical Endurance	≥ 20,000 operating cycles (per IEC 60898-1)
Pollution Degree	3 (per IEC 60664-1)
Standard	IS 8828 / IEC 60898-1 (residential) and IEC 60947-2 (industrial)
Certifications	BIS certified where applicable

⚡ Key Features

Protects circuits at 25 A with 10 kA short-circuit breaking capacity — rated for light industrial and commercial distribution boards.
Curve B tripping characteristic — optimised for cable and resistive loads (lighting, heating, socket circuits) — trips magnetically at 3–5× rated current.
1 Pole — protects a single-phase final circuit; fits standard 35mm DIN rail in distribution boards.
Thermal-magnetic trip mechanism — bimetal element trips on sustained overload, instantaneous magnetic trip on short-circuit; two independent protection functions in one compact module.
Manufactured to IS 8828 / IEC 60898-1 (residential) and IEC 60947-2 (industrial) — complies with the applicable Indian BIS and IEC international standards for this product category.
BIS certified where applicable — meets Indian regulatory requirements for use in government, commercial, and industrial electrical installations.
Genuine authorised BB10250B product — sourced directly from the official distribution network with full manufacturer traceability and warranty.
GST invoice provided for India orders — valid for corporate procurement, government project orders, and public tender supply via myelectric.in.
Worldwide export available — UAE, Singapore, UK, USA, Sri Lanka & more. Contact +91 94814 00316 for bulk pricing and international shipping.

❓ Frequently Asked Questions

Q: What load can the BB10250B protect at its rated 25 A?

A: The BB10250B is rated to carry and protect circuits up to 25 A continuously. For motor loads, ensure the full-load current (FLC) of the motor does not exceed this rating. For resistive loads (heaters, lighting), the 25 A rating is used directly. Derate by 20% for ambient temperatures above 40°C.

Q: What does the 10 kA breaking capacity on the BB10250B mean in practice?

A: Breaking capacity (10 kA) is the maximum prospective short-circuit current the BB10250B can safely interrupt without damage. Before installing, verify that the prospective fault level at the installation point does not exceed 10 kA — this is checked using a fault level calculation or from the upstream transformer impedance data. Installing a breaker with insufficient breaking capacity is a serious safety violation.

Q: Why is Curve B specified for the BB10250B and what loads is it optimised for?

A: Curve B on the BB10250B trips magnetically at 3–5× rated current, making it ideal for resistive loads such as incandescent lighting, electric heaters, and PTC elements. Using the wrong curve can cause nuisance tripping (too sensitive) or inadequate protection (not sensitive enough). Always match the curve to the load’s inrush characteristics.

Q: What happens when the BB10250B trips — how do I identify and reset it?

A: When the BB10250B trips on fault, the handle moves to a midway position (between ON and OFF), distinctly visible from a distance. To reset: (1) identify and rectify the fault, (2) push the handle fully to OFF, (3) then switch back to ON. Never force-reset without investigating the fault cause.

Q: Is the BB10250B suitable for both single-phase and three-phase systems?

A: The BB10250B is a 1 pole device for single-phase circuits. For three-phase circuits, use a 3-pole or 4-pole MCB of the same series.