Chint Moulded Case Circuit Breaker NM8N 250A 4 poles 380/415Vac 271158
CHT 271158
6941716420734
The Chint NM8N 250A 4 poles moulded case circuit breaker (271158) protects three-phase+N lines with high breaking capacity 36 kA, ideal for industrial panels 380/415 Vac, with Ir adjustment and compact dimensions.
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Type: moulded case circuit breaker (MCCB)
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Standard: EN 60947-2
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Poles: 4
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Rated current (In): 250 A
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Rated voltage (Vn): 380/415 Vac
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Max operating voltage (Ue): 690 Vac
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Insulation voltage (Ui): 1000 Vac
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Impulse voltage (Uimp): 8 kV
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Ultimate breaking capacity (Icu): 36 kA @ 380/400/415 V
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Service breaking capacity (Ics): 36 kA @ 380/400/415 V
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Ir current adjustment: 0.7 1 × In
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Utilization category: A
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Trip type: Electromechanical
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Dissipated power: 56.4 W
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Protection degree: IP00 / IP40 with terminal covers
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Dimensions (H×W×D): 157 × 140 × 88.7 mm
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Moulded case size: Frame 22
€359.90
Items Available: 2
: 1
Frequently bought together
Professional thermal-magnetic protection for distribution boards 380/415 Vac
The Chint NM8N 250A 4 poles is a moulded case circuit breaker designed for the protection of lines and equipment in distribution systems at 380/415 Vac, where high performance is required in case of overload and short circuit. The 4P solution allows for orderly management of the neutral, a feature often required in industrial, tertiary, and infrastructural panels. In applications with significant loads, choosing an MCCB with adequate breaking capacity means reducing the risk of damage to components and improving service continuity.
Breaking capacity 36 kA: safety even in networks with high short circuit
One of the strengths of the model 271158 is the Icu value of 36 kA (ultimate breaking capacity) and Ics 36 kA (service breaking capacity) at AC380/400/415V voltage. In practice, the device is also suitable for systems where the available short circuit current can be significant, offering a more reliable level of protection compared to solutions with lower Ics. This makes it suitable for main panels, distribution lines, department supplies, and sub-panels.
Ir adjustment 0.71×In: calibration based on actual load
The ability to set the Ir current between 0.7 and 1 × In allows for adapting the thermal intervention to the needs of the system. It is useful when you want to properly protect a line sized for 250A but with lower absorptions, or when a calibration consistent with selectivity and cable protection is needed. The adjustment helps reduce unwanted trips and optimize protection according to the actual load.
Dielectric performance and dissipation: designed to last
With Ui 1000 Vac and Uimp 8 kV, the NM8N offers good insulation characteristics and resistance to impulse overvoltages. The maximum operating voltage Ue 690 Vac expands its flexibility of use in industrial contexts. The dissipated power of 56.4 W is useful for evaluating ventilation and thermal management of the panel, especially in high-density component installations.
Dimensions and terminal protection: orderly integration in panel
The dimensions 157 × 140 × 88.7 mm (H×W×D) and Frame size 22 facilitate integration in panels where space is valuable. The protection degree is IP00, which becomes IP40 with terminal covers: a concrete advantage to increase safety against accidental contacts and improve the order of wiring in power sections.
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Data sheet
- Type: Switches
- Voltage: 380/415VAC
- Poles: 4P
- Breaking capacity: 36KA
- Amps: 250A
