Schneider Electric 47140 Masterpact NT12H1 3-pole 1250A 42kA fixed installation content_copy

The MasterPact NT12H1 circuit breaker from Schneider Electric is an open, fixed-mounted switch from the MasterPacT series, designed for protecting power distribution in industrial and commercial installations. It features a rated current of 1250 A at 40 °C and is designed for a rated operational voltage of 690 V AC 50/60 Hz. The IP30 protection rating according to IEC 60529 ensures protection against solid foreign objects and splashing water, making it suitable for use in enclosed switchgear. The switch is configured as 3P (three poles) and serves as a basic switch without an integrated control unit, allowing flexible combination with various protection and tripping devices such as the MicroLogic module.

Applications
The MasterPact NT12H1 is intended for use in medium to high-power installations, such as industrial distribution switchgear, power distribution systems, or for protecting large motors and transformer installations. The H1 performance class, with a maximum breaking capacity of 42 kA at 440 V AC, makes it suitable for installations with high short-circuit loads. The Category B selectivity enables targeted disconnection during fault currents, limiting the disturbance to the affected system.

Functions and Equipment in Detail
The switch features a push-button as the control element, used for manually opening and closing the switch. The maximum tripping time is 25 ms, while the maximum closing response time is 50 ms, enabling rapid reaction to disturbances. The rated short-time withstand current is 42 kA for 0.5 s and 1 s, and 24 kA for 3 s, ensuring stability under short-circuit conditions. The rated ultimate short-circuit making capacity is 88 kA across voltage ranges from 220/415 V to 690 V AC, demonstrating the ability to safely close under extreme conditions.

Technology Explained Simply
The switch is designed for fixed mounting and can be installed on a back panel or on rails. Connections are available on both the top and bottom sides, on the front and rear, allowing flexible integration into existing switchgear. The connection pitch is 70 mm, enabling standardization in enclosures. The mechanical life is 12,500 cycles without maintenance, while the electrical life is 6,000 cycles at 440 V AC and 3,000 cycles at 690 V AC, according to EN/IEC 60947-2 and -3. The power loss is 130 W, describing the thermal load during operation.

Compatibility and Accessories
The MasterPact NT12H1 is designed as a basic unit without an integrated control unit, allowing it to be combined with various protection and tripping devices such as the MicroLogic module. This enables application-specific adaptation of protection functions, such as thermal or magnetic tripping, overload or short-circuit protection. The sensor rating values of 630 A and 1250 A indicate the possible measurement ranges for integrated sensors, which are relevant when using a MicroLogic module.

Mounting and Installation
The switch is designed for mounting in enclosures and can be fixed to a back panel or on rails. Dimensions are 301 mm (height), 276 mm (width), and 196 mm (depth), allowing integration into standard switchgear with appropriate space requirements. The operating temperature range is -25 °C to 70 °C, and the storage temperature range is -40 °C to 85 °C. The operating altitude is up to 2,000 m without performance reduction, and up to 5,000 m with performance reduction.

Operational Advantages
The MasterPact NT12H1 offers high reliability due to its robust construction and long service life. The high short-circuit withstand capability and fast tripping minimize damage during disturbances. Compatibility with various tripping devices allows flexible adaptation to different requirements. Certifications CE, CCC, EAC and standards EN/IEC 60947-1 and -2 confirm compliance with international safety and quality standards. The rated insulation voltage of 1000 V AC and the rated impulse voltage withstand of 12 kV ensure electrical insulation even under transient voltage stresses.

Standards and Certifications
The switch complies with standards EN/IEC 60947-1 (general requirements) and EN/IEC 60947-2 (power circuit breakers), ensuring safety and reliability in operation. Certifications CE, CCC, EAC confirm compliance with respective regional requirements. Suitability for isolation according to EN/IEC 60947-2 allows use as a disconnecting device in switchgear.

Product Weight and Packaging
The product weight is 14 kg, and the packaging weight is 21.506 kg. The packaging unit contains one device (VPE 1: 1 piece). Packaging dimensions are 25.0 cm (height), 40.0 cm (width), and 40.0 cm (length). The warranty period is 18 months.