Technical Review: Schneider Electric EZD400E 400A 3P3T Molded Case Circuit Breaker - Selection Guide & Specs
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Overview
The Schneider Electric EZD400E 400A 3P3T Molded Case Circuit Breaker addresses critical industrial electrical protection challenges, specifically eliminating catastrophic equipment damage from overloads and short circuits in high-power applications. This robust circuit protection device provides reliable performance for industrial facilities, manufacturing plants, and commercial buildings requiring 400A circuit protection with superior breaking capacity.
Technical Analysis
The EZD400E represents Schneider Electric's commitment to industrial-grade circuit protection, featuring advanced thermal-magnetic trip technology that ensures precise overload and short-circuit protection. This molded case circuit breaker is engineered for demanding industrial environments where electrical reliability is non-negotiable.
| Specification | Value |
|---|---|
| Rated Current | 400A at 40°C |
| Number of Poles | 3P3T (3-Pole, 3-Throw) |
| Breaking Capacity | 36kA @ 415V AC |
| Rated Voltage | 690V AC |
| Network Frequency | 50/60 Hz |
| Trip Unit Type | Thermal-Magnetic (TMD) |
| Mounting Type | Bolt-On Fixed |
| Wiring Configuration | Front Wiring |
| Operating Temperature | -25°C to +70°C |
| Protection Functions | Overload, Short-Circuit |
Buying Considerations
When selecting the Schneider Electric EZD400E 400A 3P3T Molded Case Circuit Breaker, consider these critical factors:
Load Calculation: Calculate your maximum continuous load current plus 25% safety margin. The 400A rating should exceed your calculated load requirements.
Breaking Capacity Matching: Ensure the 36kA breaking capacity exceeds your facility's available short-circuit current. Consult your electrical engineer for system fault current analysis.
Application Environment: This breaker is ideal for industrial motor control centers, distribution panels, and main service entrances requiring 400A protection.
Compatibility: Verify compatibility with existing electrical panels and mounting configurations. The bolt-on fixed design requires proper panel preparation.
Standards Compliance: Confirm compliance with local electrical codes and standards for your specific application requirements.
Frequently Asked Questions
Q: What is the difference between thermal and magnetic protection in this breaker?
A: The thermal protection responds to sustained overloads (125-400% of rated current) using a bimetallic strip, while magnetic protection provides instantaneous tripping for short-circuit conditions (typically 800-1200% of rated current).
Q: Can this EZD400E breaker be used for motor circuit protection?
A: Yes, the EZD400E is suitable for motor circuit protection when properly sized. However, for motor-specific applications requiring adjustable overload settings, consider dedicated motor protection circuit breakers.
Q: What maintenance is required for this molded case circuit breaker?
A: The EZD400E requires minimal maintenance. Regular visual inspection for damage, periodic operational testing, and ensuring proper torque on connections are recommended. For comprehensive maintenance, consult Schneider Electric's technical documentation available through our product page.
