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NTMA Series Molded Case Circuit Breaker

NTMA Series Molded Case Circuit Breaker
NTMA Series Molded Case Circuit Breaker
NTMA Series Molded Case Circuit Breaker

NATUS NTMA Series molded case circuit breaker is designed for reliable protection in low voltage power distribution systems. The MCCB provides effective overload and short-circuit protection to ensure electrical safety and stable operation.

Up to 1250A
Modular Accessories
Up to 100kA Breaking
IEC 60947-2 Compliant
Thermomagnetic / Electronic Trip
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Key Benefits

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Two trip technologies
Thermomagnetic (NTMA11/31) and electronic (NTMA21)
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Modular accessory design
Modular internal accessories for on-site configuration
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High breaking capacity in compact size
Breaking capacity up to 100kA, current up to 1250A
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Overload alarm-without-tripping function
Self-diagnostic and overload alarm functions (electronic type)

Product Overview

As a reliable molded case circuit breaker manufacturer, we provide high-performance low voltage molded case circuit breaker solutions for AC 50/60Hz distribution systems up to 690V and 1250A. This mold case circuit breaker delivers reliable overload, short-circuit, and undervoltage protection for power lines and electrical equipment, while supporting occasional circuit switching and motor starting. Available with both thermomagnetic and electronic trip units, this molded case breaker meets diverse industrial and commercial application requirements with stable performance and flexible protection options.
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Product Structure

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Type A molded case breaker: The N pole is not equipped with an overcurrent release. It remains permanently connected and does not open or close with the other three poles. Type B molded case breaker: The N pole is not equipped with an overcurrent release, but it operates (opens and closes) together with the other three poles.

For the overcurrent tripping mode with thermal overload alarm but no tripping, only type 200 can be selected. Furthermore, the thermal overload alarm (non-tripping) function operates independently of the alarm contact accessory, and both features can be present simultaneously.

Technical Advantages

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Multi-direction mounting and wiring
Adapts to various cabinet layouts
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PV-specific version
Meets automatic reclosing requirements for photovoltaic systems
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Versatile Mounting Connection
Vertical / horizontal mounting, bottom-to-top connection supported

Technical Specifications

ModelRated current In (A)Number of polesRated working voltageRated insulation voltageRated impulse withstand voltageArcing DistanceRated ultimate short-circuit breaking capacityRated service short-circuit breaking capacityOperating performance (times)
Ue (V)Ui (V)Uimp (V)(mm)Icu (kA)Ics (kA)Power onNot powered
NTMA11-100C16, 20, 25, 32, 40, 50, 63, 80, 1003P4008008000≤503522800020000
NTMA11-100L3P、4P5035
NTMA11-100M3P、4P7050
NTMA11-250C100, 125, 140, 160, 180, 200, 225, 2503P3522
NTMA11-250L3P、4P5035
NTMA11-250M3P、4P7050
NTMA11-400C225, 250, 315, 350, 4003P≤1003535750010000
NTMA11-400L3P、4P5050
NTMA11-400M3P、4P7070
NTMA11-630C400, 500, 6303P3535
NTMA11-630L3P、4P5050
NTMA11-630M3P、4P7070

Application Scenarios

Product FAQ

Type A N-pole molded case circuit breaker is permanently connected; Type B N-pole molded case circuit breaker switches together with the three phases. Neither has overcurrent release.
Yes, selected models support this function to ensure power continuity for critical loads.
Yes, both vertical and horizontal mounting are supported.

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Need customized configurations, CAD drawings, or a competitive price for this product? Submit your project requirements and our engineering team will get back to you within 24 hours.
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    Email: icd@natus-cn.com
    Tel: 400-928-1888
    Add: No. 369, Labor East Road, Tianning District, Changzhou City, Jiangsu Province
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