Product Name:

Schneider C25H42D250 – Molded Case Circuit Breaker (MCCB)
Series: ComPacT NSX250H
Type: 4 Poles (4d – Neutral fully protected), MicroLogic 2.2 Trip Unit
Breaking Capacity: 70kA at 415VAC
Rated Current: 250A

1. Overview:

The C25H42D250 is a high-performance MCCB (Molded Case Circuit Breaker) from Schneider’s ComPacT NSX series. It is designed for advanced protection, control, and monitoring of electrical power systems in critical and high-load environments.

This model is capable of interrupting very high fault currents up to 70kA at 415V AC, with a MicroLogic 2.2 electronic trip unit for precise and flexible protection.

2. Key Features:

???? ComPacT NSX250H Series:

• NSX250H = Frame size up to 250A, with H = High breaking capacity (70kA @ 415VAC).

• Suitable for systems requiring very high short-circuit protection.

???? Rated Current – 250A:

• Handles continuous current up to 250 amps, ideal for large sub-panels, machinery, or feeder lines.

???? Breaking Capacity – 70kA @ 415VAC:

• Can interrupt up to 70,000 amps of short-circuit current safely.

• Suitable for critical installations with high fault level potential, like industrial plants or large commercial buildings.

???? 4 Poles – Type 4d (Neutral Fully Protected):

• 4-pole configuration:

  • L1, L2, L3 + Neutral

  • All four poles are fully protected, meaning the neutral has the same level of protection as the phase lines.

• Ideal for balanced and unbalanced 3-phase systems, especially where neutral safety is critical (e.g. electronic loads).

???? Trip Unit – MicroLogic 2.2 (Electronic):

• MicroLogic 2.2 is an electronic trip unit that provides more accurate and flexible protection than thermal-magnetic units.

• Key protections:

  • Overload (Long-Time Delay – Ir)

  • Short-Time Delay

  • Instantaneous Trip (Short Circuit)

  • Ground Fault protection not included in 2.2 (available in higher models).

• Adjustable Settings: Allows users to fine-tune protection levels to match the load and system requirements.

3. Applications:

• Main Circuit Breaker in Large Panels

• Industrial Plants: Where high fault current levels are present.

• Critical Loads: Data centers, hospitals, and factories requiring high protection reliability.

• Sensitive Equipment: Where neutral protection is important due to unbalanced or nonlinear loads.

4. Mounting & Accessories:

• Fixed Installation: Bolted into place inside distribution boards.

• Modular Design: Supports a wide range of accessories, including:

  • Shunt trips

  • Auxiliary contacts

  • Under-voltage releases

  • Motorized control modules

• Front terminals for easy wiring.

5. Advanced Protection Features (via MicroLogic 2.2):

6. Summary:

The Schneider C25H42D250 is a 4-pole, 250A MCCB with full protection on all poles including neutral (4d), equipped with a MicroLogic 2.2 electronic trip unit, and offers a high breaking capacity of 70kA at 415VAC. It’s ideal for high-demand installations where precise protection and safety are essential, especially in industrial and mission-critical environments