EZC400N3400N Circuit breaker Easypact EZC400N - TMD - 400 A - 3 poles 3d

The Schneider Electric Easypact EZC400N3400N is a 400 A, 3-pole fixed-mount moulded case circuit breaker (MCCB) with a 36 kA breaking capacity at 415 V AC, built for the protection of low-voltage distribution circuits in industrial plants and commercial buildings. It uses a TMD thermal-magnetic trip unit providing fixed overload and instantaneous short-circuit protection, making it a reliable, maintenance-free choice for panel builders and OEMs across the UAE and wider GCC.

Quick Specs

• Manufacturer part number EZC400N3400N, Schneider Electric Easypact EZC400N range.
• Rated current (In) of 400 A at 40 °C ambient.
• Breaking capacity (Icu) of 36 kA at 400/415 V AC, conforming to IEC 60947-2.
• Three poles, 3-pole protected (3P 3d), thermal-magnetic TMD trip unit.
• Rated operational voltage (Ue) of 440 V AC 50/60 Hz and 250 V DC.
• Rated insulation voltage (Ui) of 690 V AC; impulse withstand (Uimp) of 6 kV.
• Operating temperature range of -25 to 70 °C, suited to high-ambient GCC installations.
• Genuine Schneider Electric stock with fast UAE and GCC dispatch from Dubai.

Applications & Compatibility

The EZC400N3400N is designed for main and sub-distribution protection in industrial and building installations where a compact, competitively priced 400 A MCCB is required. Typical uses include incomer and outgoing feeder protection in distribution boards, motor and machine supply protection for OEM panels, and general circuit protection in commercial developments.

• Suits panel builders and MEP contractors needing a 400 A frame with 36 kA fault withstand.
• Accepts the standard Easypact EZC accessory range — rotary handles, shunt trips, undervoltage releases, auxiliary and signalling contacts, terminal shrouds and phase barriers.
• For sites near high-capacity transformers requiring a higher fault rating, the EZC400H offers 50 kA in the same frame; ask our team if you need help selecting the correct Icu.

Why Buy From Electrical Junction

We are a Dubai-based specialist distributor of genuine Schneider Electric switchgear, not an anonymous marketplace reseller. Every order is handled by a small, hands-on team, so your enquiry reaches someone who knows the product.

• Genuine Schneider Electric Easypact stock, with VAT invoicing for UAE businesses.
• Engineer-reviewed technical support for export and international buyers — useful when you need to confirm frame, trip unit or accessory compatibility before ordering.
• Walk-in trade counter in Deira, Dubai for buyers who want to verify stock in person before committing.
• Direct sourcing through our Mumbai arm supports competitive pricing and restocking on the wider EZC range.

Frequently Asked Questions

What is the breaking capacity of the EZC400N3400N?

The EZC400N3400N has an ultimate breaking capacity (Icu) of 36 kA at 400/415 V AC, conforming to IEC 60947-2. It also provides 40 kA at 220/230 V AC. For distribution boards located close to a high-capacity transformer where the prospective fault current exceeds 36 kA, choose the 50 kA EZC400H instead.

What does the TMD trip unit mean, and is it adjustable?

TMD is a thermal-magnetic trip unit rated at 400 A that provides fixed overload (thermal) and instantaneous short-circuit (magnetic) protection. It is a sealed, maintenance-free unit — unlike the electronic MicroLogic trip units on higher ComPact and EasyPact CVS ranges, the base TMD is not electronically adjustable.

What is the difference between Easypact EZC and Easypact CVS?

Easypact EZC is the economical fixed-configuration MCCB range aimed at OEM and building applications, while Easypact CVS is a step up offering higher breaking capacities and electronic trip unit options. For a straightforward 400 A feeder needing 36 kA, the EZC400N3400N is the cost-effective choice; specify CVS only if you need adjustable electronic protection or a higher fault rating.

Is this breaker suitable for GCC conditions and 60 Hz supplies?

Yes. The EZC400N3400N is rated for 50/60 Hz operation and an ambient range of -25 to 70 °C, so it is suitable for high-ambient installations across the UAE, Saudi Arabia and the wider GCC. Note that continuous current capacity derates with rising ambient temperature, so allow for site conditions when sizing.

Is it a 3-pole unit and can it be used on DC?

It is a 3-pole, 3-pole-protected (3P 3d) device with a rated operational voltage of 440 V AC. It also carries a 250 V DC rating, but DC applications require the correct pole arrangement and derating — contact our engineering team before applying it on a DC circuit.