DN3-400N MCCB 400 3P 415V AC 50kA Thermal Magnetic 50/60 Hz | L&T – CM94003OOR1OG

Name: L&T DN3-400N MCCB 400A 3P 415V 50kA Circuit Breaker | CM94003OOR1OG
Brand: Lauritz Knudsen (L&T)
SKU: CM94003OOR1OG
Price: 26358.00 INR
Availability: InStock

SKU: CM94003OOR1OG

Original price was: ₹57,300.00.Current price is: ₹26,358.00. Excl. GST

In stock

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📋 Technical Specifications

Parameter	Value
Brand	CM94003OOR1OG
Part Number / SKU	CM94003OOR1OG
Category	MCCB
Voltage Rating	415V AC
Poles	3 Poles
Breaking Capacity	50 kA
Frequency	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.
3 Poles — three-phase feeder protection; neutral not switched (TN-C / IT systems).
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 CM94003OOR1OG 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 does the 50 kA breaking capacity on the CM94003OOR1OG mean in practice?

A: Breaking capacity (50 kA) is the maximum prospective short-circuit current the CM94003OOR1OG 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: Can the CM94003OOR1OG be motorised for remote switching and automation?

A: Yes. CM94003OOR1OG 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 CM94003OOR1OG use — thermal-magnetic or electronic?

A: The CM94003OOR1OG 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.

Q: Is the CM94003OOR1OG 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 CM94003OOR1OG coordination table for the specific contactor-overload-MCCB combination to confirm Type 1 or Type 2 coordination is achieved.

Q: After a short-circuit trip on the CM94003OOR1OG, can it be reset and reused immediately?

A: After a short-circuit trip, do not immediately reset the CM94003OOR1OG. First, identify and clear the fault. Then inspect the device — if there is visible arc damage, melted insulation, or the handle does not reset smoothly, the device must be replaced. The 50 kA rated breaking capacity is not unlimited — it is the maximum fault current the device can interrupt safely for a defined number of operations (typically 1–3 at full Icu rating). After any significant fault, factor replacement into your maintenance budget.