Eaton NZMN3-SE450-CNA Molded Case Circuit Breaker - 50 kAIC
Part Number: NZMN3-SE450-CNA
Quick Summary
Eaton NZMN3-SE450-CNA Molded Case Circuit Breaker protects critical power circuits by interrupting fault currents in industrial control panels. Facing space constraints and the need for reliable protection, engineers seek MCCBs that combine compact footprint with robust protection features. Industry-standard performance often hinges on high fault-current handling, easy wiring, and dependable trip behavior, especially in harsh environments. The NZMN3-SE450-CNA delivers phase-failure sensing, electronic switch-off, and a wide adjustment range to coordinate with upstream protection, while maintaining a compact form factor. This combination supports electrical protection in motor control centers, panel boards, and MCC installations, delivering value through safer operation and reduced downtime.
Product Information
Extended Description
NZMN3-SE450-CNA Eaton: MCCB NZM, NZM3 Mag Only Breakers, Circuit Breaker, Screw conn., Three-pole, 875A Perm. Cur., 50 kA, 438-875A Set. Rng OL Prot., 875-12250A Undelayed Adj. Rng., 250 kW at 230V, 500 kW at 400V, Phase failure sensitive, electronic switch off
Product Name
Eaton Series NZM molded case circuit breaker
Catalog Number
NZMN3-SE450-CNA
EAN
4015082844653
Product Length/Depth
1.378 in
Product Height
1.378 in
Product Width
1.378 in
Product Weight
5.5 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Compliances
Contact Manufacturer
Certifications
Contact Manufacturer
Special features
Phase failure sensitive, electronic switch off
Circuit breaker type
NZM3
Adjustment range short-circuit release
875-12250A delayed
Rated permanent current
875A
Setting Range Ol Protector
438-875A
Short-circuit breaking capacity
50 kAIC
Connection
Screw
Rated operational current
250 kW at 230 V 500 kW at 400 V
Number of poles
Three-pole
Feature → Business Impact → Application: Three-pole design with screw connection simplifies installation and improves contact reliability in control panels, reducing field wiring time and strengthening bus stability in MCCs. Three-pole protection supports balanced motor loads and minimizes phase-related faults in industrial drives. Feature → Business Impact → Application: Phase failure sensitive operation with electronic switch-off enhances safety by rapidly isolating the circuit when power quality is compromised, reducing motor damage and unplanned downtime in manufacturing lines. Feature → Business Impact → Application: Adjustable short-circuit release from 875 to 12250 A delayed provides flexible coordination with upstream protection, enabling selectivity in complex power distribution networks and lowering nuisance trips in high-current environments. Feature → Business Impact → Application: Rated permanent current of 875 A and setting range 438–875 A enable precise protection for large MCC feeders, ensuring reliable interrupting capacity without over-tripping in high-load scenarios. Feature → Business Impact → Application: Short-circuit breaking capacity of 50 kAIC supports high fault currents, protecting upstream devices and reducing equipment damage in electrical rooms and data centers. Feature → Business Impact → Application: Rated operational power of 250 kW at 230 V and 500 kW at 400 V aligns with motor and drive protection needs in industrial facilities, delivering predictable performance across common MCC applications. Feature → Business Impact → Application: Compact dimensions (1.378 in per side) and 5.5 lb weight enable easier installation in crowded panelboards and retrofit projects, improving maintenance access and reducing enclosure space requirements. Feature → Business Impact → Application: Phase failure sensitivity and the NZM3 family lineage assure compatibility with Eaton protective schemes and replacement cycles, minimizing engineering deviations during upgrades in existing installations.
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FAQs
The NZMN3-SE450-CNA is designed with screw connection terminals for reliable field wiring, making it highly compatible with common MCCB panelboard installations and retrofit projects. Ensure proper torque and conductor sizing per Eaton guidelines to maintain a stable, code-compliant connection.
50 kAIC indicates the instantaneous fault current the breaker can interrupt without damage. This rating supports high fault currents typical in industrial plants, protecting feeders, switchgear, and downstream equipment while reducing the risk of cascading failures during faults.
Yes. The NZMN3-SE450-CNA offers an adjustment range for the short-circuit release from 875 to 12250 A (delayed). This allows you to coordinate with upstream protection and achieve selective tripping, minimizing downtime and protecting non-faulted circuits.
This three-pole MCCB is ideal for motor control centers, panelboard protection, and large feeders in manufacturing facilities and processing plants. Its phase-failure sensing and electronic switch-off support safe operation, while the high current rating and 50 kAIC capability handle demanding industrial loads.
Compliances and certifications should be confirmed with Eaton as listed in the product data. In practice, verify local regulatory requirements (CE/UL/IEC standards as applicable to your region) and ensure correct installation per Eaton’s installation guides and your facility’s safety policies.