EXORA MCB 50A SP 240V AC 10kA B Curve | L&T – BB10500B

Name: L&T BB10500B 50A SP MCB, 240V AC, B Curve, 10kA
Brand: Lauritz Knudsen (L&T)
SKU: BB10500B
Price: 367.65 INR
Availability: InStock

SKU: BB10500B

Original price was: ₹855.00.Current price is: ₹367.65. Excl. GST

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📋 Technical Specifications

Parameter	Value
Brand	BB10500B
Part Number / SKU	BB10500B
Category	Miniature Circuit Breaker (MCB)
Current Rating	50 A
Voltage Rating	240V AC
Poles	1 Pole
Breaking Capacity	10 kA
Tripping Curve	Curve B
Standard	IS 8828 / IEC 60898-1 (residential) and IEC 60947-2 (industrial)
Certifications	BIS certified where applicable

⚡ Key Features

Protects circuits at 50 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 BB10500B 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 BB10500B protect at its rated 50 A?

A: The BB10500B is rated to carry and protect circuits up to 50 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 50 A rating is used directly. Derate by 20% for ambient temperatures above 40°C.

Q: What does the 10 kA breaking capacity on the BB10500B mean in practice?

A: Breaking capacity (10 kA) is the maximum prospective short-circuit current the BB10500B 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 BB10500B and what loads is it optimised for?

A: Curve B on the BB10500B 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: Is the BB10500B suitable for both single-phase and three-phase systems?

A: The BB10500B 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.

Q: Can the BB10500B be DIN rail mounted in any standard distribution board?

A: Yes. This BB10500B MCB uses the standard 35mm EN 60715 DIN rail and 17.5mm module width, making it compatible with all major brand distribution boards and enclosures. Terminal capacity accommodates both rigid and flexible conductors up to the rated cross-section.