Eaton NZMB1-S33-CNA Molded Case Circuit Breaker - 25 kAIC
Part Number: NZMB1-S33-CNA
Quick Summary
NZMB1-S33-CNA molded case circuit breaker provides reliable motor protection in control panels. Engineers often wrestle with nuisance trips and wiring complexity that disrupt uptime and extend commissioning. Typical industry standards for this class include CE marking, IP protection ratings, and SIL readiness; verify exact approvals with Eaton. With magnetic-only trip and the NZM1 frame, this unit offers compact integration, fast fault isolation, and predictable motor protection. The combination supports easier installation, reduced panel footprint, and lower total cost of ownership across automated lines. Designed for 480 Vac operation and 33 A loads, it integrates with modern motor control centers and drives.
Product Information
Extended Description
NZMB1-S33-CNA Eaton: Eaton Series NZM complete molded case circuit breaker, NZM1-frame, NZMB1, Magnetic only trip, 18-33A, Three-pole, 33A, 480 Vac, 25 kAIC, Motor protection without overload release, Magnetic switch off, 0.55 kW at 230 Vac, 1.1 kW at 400 Vac
Product Name
Eaton Series NZM complete molded case circuit breaker
Catalog Number
NZMB1-S33-CNA
EAN
4015081028634
Product Length/Depth
2.68 in
Product Height
5.71 in
Product Width
3.54 in
Product Weight
3 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
Special features
Magnetic switch off
Amperage Rating
33 A
Voltage rating
480 Vac
Trip Type
Magnetic only
Circuit breaker type
NZMB1
Frame
NZM1
Class
Motor protection without overload release
Short-circuit breaking capacity
25 kAIC
Interrupt rating
25 kAIC
Rated operational current
1.1 kW at 400 Vac 0.55 kW at 230 Vac
Number of poles
Three-pole
Trip rating
18-33 A
Magnetic-only trip with a 25 kAIC short-circuit rating delivers fast fault isolation, reducing arc energy and protecting downstream drives and wiring. This supports safer startups and minimizes unplanned downtime in busy machine lines. Use this in three-pole motor circuits rated at 33 A and 480 Vac, where reliable interruption is critical for uptime. NZMB1-S33-CNA fits the NZM1 frame, simplifying replacement or upgrades in existing panels. The compact dimensions—2.68 in depth, 5.71 in height, 3.54 in width—maximize panel space and streamline wiring during installation. Motor protection without overload release means you can pair this MCCB with a separate overload relay, giving coordinated protection for motors and drives. This separation reduces nuisance trips in variable-speed applications and simplifies protection schemes for engineers designing modern automation systems. Designed for 480 Vac operation with a three-pole configuration, this unit delivers predictable coordination with standard motor control components and control cabinets. Magnetic switch-off provides clear, unambiguous shutdown signals, improving safety and ease of maintenance. Warranty and service support from Eaton includes a one-year policy from installation or 18 months from shipment, whichever comes first, helping minimize total cost of ownership.
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FAQs
Yes. The NZMB1-S33-CNA is designed for the NZM1 frame, aligning with other NZM-based molded case breakers to simplify replacement, panel upgrades, and retrofits in existing motor control centers. Its 3-pole configuration and 480 Vac rating support standard Eaton MCCB installations without requiring separate mounting adapters.
Key specs include a three-pole configuration, 33 A rated operating current, 480 Vac voltage rating, 25 kAIC short-circuit breaking capacity, and a magnetic-only trip type. These parameters ensure fast isolation of motor faults while supporting robust protection in typical industrial panels.
Ideal for motor protection in control cabinets, machine tools, conveyors, and pump panels. The magnetic-only trip and 25 kAIC rating provide fast fault clearance, helping minimize downtime and equipment damage in continuous automation lines.
The datasheet notes manufacturer-level compliance; typical industry practice includes CE markings and protection ratings. Exact approvals should be confirmed with Eaton for the specific installation location and regulatory requirements to ensure full compliance in your jurisdiction.
Eaton provides a warranty of one year from installation or eighteen months from shipment, whichever occurs first. Routine maintenance for MCCBs is typically minimal but should include periodic inspection of terminal torque, mounting integrity, and drive system coordination when paired with an overload relay.