L&T DU400N MCCB 400A (320-400A) 4 Pole 50kA Thermal Magnetic | CM98404OORO

Looking for the L&T DU400N MCCB 400A 4 Pole? This is the genuine Lauritz Knudsen (formerly L&T Switchgear) DU series moulded case circuit breaker, catalog number CM98404OORO, made for feeder, incomer and sub-distribution protection in commercial buildings, industries and OEM panels. We stock it at our Chamrajpet shop in Bengaluru with a GST invoice on every order, same-day dispatch for orders placed before 4 PM (Monday to Saturday), and delivery across all of Bengaluru including outskirts. Free store pickup is available. For project and bulk rates, WhatsApp us on +91 78160 62494.

Breaking capacity is 50 kA at 415V AC, with Ics = 50% of Icu. The DU range gives you an adjustable thermal (overload) setting from 0.8 to 1.0 times In – this unit covers 400A (320-400A) – with a fixed magnetic short-circuit trip at 9 times the rated current (3600A here). That adjustability lets you trim the overload trip to the actual load and cable size during commissioning.

Spreader terminals are not included with this catalog number – if your panel needs them for cable termination (185 mm mm2 lugs), add the matching DU400N 4 pole spreader link set and, for panel-door operation, the direct or extended rotary handle from the Frequently Bought Together section below. One set covers one MCCB. Phase barriers are supplied with the unit.

Practical panel-builder details: no load-line bias, so supply and load can connect to either side; clear ON / TRIP / OFF indication; suitable for isolation; conforms to IS/IEC 60947-2, IEC 60947-2 and EN 60947-2.

Note on branding: L&T Switchgear is now Lauritz Knudsen Electrical & Automation (renamed in May 2024). Depending on stock, the unit may carry either the L&T or Lauritz Knudsen name. The catalog number, specifications and quality are identical.

📋 Technical Specifications

⚡ Key Features

• Genuine L&T / Lauritz Knudsen DU400N MCCB – catalog no. CM98404OORO
• 400A, 4 Pole, 50 kA breaking capacity at 690V AC (Ics = 50% of Icu)
• Adjustable thermal release 0.8 – 1.0 x In; fixed magnetic trip at 9 x In
• Phase barriers included; spreader terminals and rotary handles available separately below
• No load-line bias – connect supply and load on either side
• Clear ON / TRIP / OFF indication; suitable for isolation
• GST invoice on every order; same-day dispatch in Bengaluru for orders before 4 PM

📄 Official Catalogue / Datasheet

Download the official L&T / Lauritz Knudsen DU/DY MCCB catalogue (covers DU400N technical data, trip curves, accessories and dimensions): DU/DY MCCB Catalogue (PDF, official)

❓ Frequently Asked Questions