DU400N MCCB 320A 4P 415V AC 50kA Thermal Magnetic 50/60 Hz | L&T – CM98404OOQO

Name: L&T DU400N MCCB 320A 4P 415V 50kA Circuit Breaker | CM98404OOQO
Brand: Lauritz Knudsen (L&T)
SKU: CM98404OOQO
Price: 23560.00 INR
Availability: InStock

SKU: CM98404OOQO

Original price was: ₹38,000.00.Current price is: ₹23,560.00. Excl. GST

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Sourced through authorised channels, the CM98404OOQO CM98404OOQO mccb delivers dependable performance for reliable circuit protection and isolation. Key ratings include 320 A, 415V AC, 4 Poles. myelectric.in stocks the DU400N MCCB 320A 4P 415V AC 50kA Thermal Magnetic 50/60 Hz | L&T for contractors, panel builders, and project buyers — buy online with GST invoice, or request a bulk quote for domestic supply and export to UAE, Singapore, UK, USA, Sri Lanka and more.

📋 Technical Specifications

Parameter	Value
Brand	CM98404OOQO
Part Number / SKU	CM98404OOQO
Category	MCCB
Current Rating	320 A
Voltage Rating	415V AC
Poles	4 Poles
Breaking Capacity	50 kA
Frequency	60 Hz
Rated Operational Voltage (Ue)	415V AC (50/60 Hz)
Mounting	Fixed, front connected
Rated Frequency	50/60 Hz
Standard	IEC 60947-2 / IS 13947-2
Certifications	BIS certified where applicable

⚡ Key Features

50 kA breaking capacity at 415V AC — safely clears bolted three-phase faults in high-power substations and MV/LV transformer secondaries.
Thermal-magnetic trip unit — factory-calibrated overload and short-circuit protection; suitable for standard feeder circuits without electronic adjustment.
4 Poles — three-phase + switched neutral (TN-S system) for full four-pole isolation per IEC 60364.
Manufactured to IEC 60947-2 / IS 13947-2 — 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 CM98404OOQO 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 CM98404OOQO protect at its rated 320 A?

A: The CM98404OOQO is rated to carry and protect circuits up to 320 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 320 A rating is used directly. Derate by 20% for ambient temperatures above 40°C.

Q: What does the 50 kA breaking capacity on the CM98404OOQO mean in practice?

A: Breaking capacity (50 kA) is the maximum prospective short-circuit current the CM98404OOQO can safely interrupt without damage. Before installing, verify that the prospective fault level at the installation point does not exceed 50 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: Is the CM98404OOQO suitable for use as a motor branch circuit protector (Type E coordination)?

A: MCCBs used for motor branch circuit protection must be coordinated with the downstream overload relay for Type 2 coordination (no damage to contactor or relay on short-circuit). Verify the CM98404OOQO coordination table for the specific contactor-overload-MCCB combination to confirm Type 1 or Type 2 coordination is achieved.

Q: Can the CM98404OOQO be motorised for remote switching and automation?

A: Yes. CM98404OOQO MCCBs in this series support rotary handle adaptation and motorised operating mechanisms as accessories, enabling remote ON/OFF switching via PLC, SCADA, or BMS. Motorised MCCBs are used for automatic load management and remote trip in automated distribution systems.

Q: What trip unit type does the CM98404OOQO use — thermal-magnetic or electronic?

A: The CM98404OOQO uses a thermal-magnetic TMD trip unit — thermal bimetal for overload protection and electromagnetic mechanism for short-circuit. Compact, reliable, and maintenance-free for standard applications.