Eaton NZM Series NZMN3-AE250 — NZM3‑Frame 3‑Pole Molded Case Circuit Breaker (MCCB), 250A Permanent, Adjustable Overload 125–250A, Thermal‑Magnetic T268, 50 kAIC (415V) / 42 kAIC (480V), Front Screw, Rocker Lever (Motor Drive Optional)

The Eaton NZMN3-AE250-NA is a NZM3‑frame molded case circuit breaker (MCCB) engineered for distribution circuit protection in industrial and commercial installations. This three‑pole thermal‑magnetic device provides adjustable overload and short‑circuit protection, front screw connections for secure terminations, and optional actuator/accessory compatibility for flexible system integration.

Key specifications

• Manufacturer: Eaton
• Series / Frame: NZM Series — NZM3 frame (NZMN3 family)
• Catalog number / Part no.: NZMN3-AE250-NA
• Product type: Molded Case Circuit Breaker (MCCB) — Distribution circuit protection
• Poles: 3‑pole
• Permanent (rated) current: 250 A
• Overload (long‑time) adjustment range: 125–250 A
• Trip type / trip unit: Thermal‑magnetic, T268 designation
• Short‑circuit / short‑time adjustment (undelayed/instantaneous) range: 500–2750 A (manufacturer stated adjustment range for undelayed)
• Interrupting / breaking capacity: 50 kAIC (at 415 V AC); 42 kAIC (at 480 V AC)
• Voltage rating: 690 V AC (rated)
• Connection method: Front screw (line/load)
• Accessories: Rocker lever standard; motor drive optional
• Dimensions (W x H x D): approximately 5.512 in x 5.512 in x 6.535 in
• Weight: 13.977 lb
• Number of poles: Three‑pole

Features & benefits

• NZM3 frame delivers high performance for medium‑power distribution and feeder protection.
• Wide adjustable overload range (125–250 A) for precise coordination with downstream equipment.
• High interrupting capacity (50 kAIC @ 415 V; 42 kAIC @ 480 V) suitable for high‑fault environments.
• Front screw connections provide robust, serviceable terminations.
• Optional motor drive and rocker lever operator enable integration into automated or remote‑operated systems.

Applications

• Switchboards, distribution panels, main and feeder protection in industrial/commercial power systems requiring adjustable protection in the 125–250 A range.

Installation & safety notes

• Use Eaton time‑current curves and coordination guides to configure long‑time and instantaneous settings for selectivity and system protection.
• Confirm short‑circuit/undelayed adjustment settings (500–2750 A) and coordination requirements against site fault levels.
• Follow Eaton installation instructions for torque values, accessory compatibility and ambient derating.

Documentation & support

• For complete technical data, trip curves, accessory ordering and installation details, consult Eaton NZM series product literature or Eaton technical support.