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nm8s-1250s-3p-1250a chint 1250a 3p electronic adjustable thermal & magnetic mccb
MPN: NM8S-1250S-3P-1250A
Alt. SKU: NM8S1250S3P1250A
Special Price
£1,716.34
£1,430.28
Regular Price
£3,814.08
Why Choose the CHINT NM8S-1250S-3P-1250A
The NM8S-1250S-3P-1250A is a high-capacity moulded case circuit breaker with an electronic adjustable trip unit for precise protection and selectivity on large feeders and incomers. This 3-pole, 1250 A S-code device delivers a 50 kA Icu at 380 to 415 V AC, supports systems up to 690 V AC, and complies with IEC/EN 60947-2. It integrates with a full accessory range including shunt and under-voltage releases, auxiliary and alarm contacts, and direct or extended rotary handles.
Technical Specifications
- Manufacturer: CHINT
- Series: NM8S Electronic MCCB
- Model: NM8S-1250S-3P-1250A
- Type: Electronic-trip MCCB, 3-pole, fixed
- Rated current In: 1250 A at 40 °C
- Frame size: 1250 A
- Rated operational voltage Ue: up to 690 V AC, 50 or 60 Hz
- Rated insulation voltage Ui: 800 V
- Impulse withstand Uimp: 8 kV
- Breaking capacity code: S (standard) with current-limiting technology
- Ultimate breaking capacity Icu: 50 kA at 380–415 V AC
- Service breaking capacity Ics: 50% of Icu at 380–415 V AC
- Short-circuit making capacity Icm: typically ~105 kA at 415 V AC for S variants
- Utilisation category: A
- Suitability for isolation: Yes, to IEC 60947-2
- Operating ambient: −5 to +40 °C (ratings at +40 °C); altitude ≤ 2000 m; pollution degree 3
- Electronic trip adjustments (typical NM8S-800/1250/1600 module):
- Long-time IR: 0.4 to 1.0 × In
- Short-time Isd: 3, 6, 12 or 18 × In with adjustable delay
- Instantaneous Ii: OFF, 1.5, 2, 3, 4, 6, 8, 10, 12 × In
- Dimensions W × H × L (3-pole fixed, large frame): approx. 210 × 370 × 196 mm
- Weight: approx. 17.5 kg
- Mounting: Panel, fixed front connection (rear connection and plug-in options available in the range)
- Accessories: Auxiliary and alarm contacts, shunt release, under-voltage release, motor mechanism, direct or extended rotary handle, terminal kits, interphase barriers
- Standards and approvals: IEC/EN 60947-2, CE; DNV/KEMA certifications available for NM8S family
- Typical applications: Main incomers, large distribution feeders, MCCs, HVAC and process loads requiring precise coordination
Frequently Asked Questions
- What are the breaking and making capacities at 415 V
- What can I adjust on the electronic trip unit
- What are the physical dimensions for panel layout
- Does it meet isolation and IEC requirements
- Which accessories are supported
Trusted By Customers Worldwide
"The NM8S at 1250 A gives reliable fault clearance and easy fine-tuning. The accessory ecosystem covers everything we need for safe operation and maintenance." Senior Panel Builder, UK
The NM8S S-code provides Icu 50 kA at 380–415 V AC with Ics 50% of Icu. The short-circuit making capacity is typically around 105 kA at 415 V for S variants. For higher duties, consider H or R codes.
Adjustable long-time IR from 0.4 to 1.0 × In, short-time Isd selections of 3, 6, 12 or 18 × In with delay, and instantaneous Ii up to 12 × In. Settings allow selective coordination with downstream protective devices.
The 3-pole fixed large-frame unit is approximately 210 × 370 × 196 mm17.5 kg
Yes. The NM8S series conforms to IEC/EN 60947-2, is utilisation category A, with Ui 800 V and Uimp 8 kV, and is suitable for isolation.
Auxiliary and alarm contacts, shunt and under-voltage releases, motor operator, direct or extended rotary handles, terminal kits, and interphase barriers. Check stock options for the 1250-frame body.
| Manufacturer Part Number | NM8S-1250S-3P-1250A |
|---|---|
| Barcode | 6925808335823 |
| Protection Type | MCCB |
| Manufacturer | Chint |
| Number of Poles | 3 Pole |
| Amperage | 1250A |
| Alternative Product SKU | NM8S1250S3P1250A |
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