AU HR MCB 80A SP 240V AC 15kA D Curve | L&T – AU15S10803D

Name: L&T AU15S10803D 80A SP MCB, D Curve, 240V AC
Brand: Lauritz Knudsen (L&T)
SKU: AU15S10803D
Price: 2013.60 INR
Availability: InStock

SKU: AU15S10803D

Original price was: ₹4,195.00.Current price is: ₹2,013.60. Excl. GST

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📋 Technical Specifications

Parameter	Value
Brand	AU15S10803D
Part Number / SKU	AU15S10803D
Category	Miniature Circuit Breaker (MCB)
Current Rating	80 A
Voltage Rating	240V AC
Poles	1 Pole
Breaking Capacity	15 kA
Tripping Curve	Curve D
Standard	IS 8828 / IEC 60898-1 (residential) and IEC 60947-2 (industrial)
Certifications	BIS certified where applicable

⚡ Key Features

Protects circuits at 80 A with 15 kA short-circuit breaking capacity — rated for industrial sub-distribution boards with high prospective fault currents.
Curve D tripping characteristic — optimised for high-inrush loads (transformers, solenoids, welding machines) — trips magnetically at 10–20× 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 AU15S10803D 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 AU15S10803D protect at its rated 80 A?

A: The AU15S10803D is rated to carry and protect circuits up to 80 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 80 A rating is used directly. Derate by 20% for ambient temperatures above 40°C.

Q: What does the 15 kA breaking capacity on the AU15S10803D mean in practice?

A: Breaking capacity (15 kA) is the maximum prospective short-circuit current the AU15S10803D can safely interrupt without damage. Before installing, verify that the prospective fault level at the installation point does not exceed 15 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 D specified for the AU15S10803D and what loads is it optimised for?

A: Curve D on the AU15S10803D trips magnetically at 10–20× rated current, making it ideal for highly inductive loads with large inrush — transformers, large motors, welding machines. 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 AU15S10803D trips — how do I identify and reset it?

A: When the AU15S10803D 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 AU15S10803D suitable for both single-phase and three-phase systems?

A: The AU15S10803D 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.