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Product Overview: ABB NBRC-51C
Brand
Series
NBRC Series (Residual Current Circuit Breaker / Thermal-Magnetic Protection)
Product Description
The ABB NBRC-51C is a thermal-magnetic residual current circuit breaker designed for low-voltage applications. It combines the features of overcurrent protection with residual current (earth fault) detection to ensure maximum safety for both personnel and equipment.
This device is particularly suitable for industrial, commercial, and residential installations where protection against short circuits, overloads, and leakage currents is essential. Its compact and modular design allows easy integration into electrical panels and motor control centers, providing both safety and reliability.
The NBRC-51C is engineered for long-term operation with minimal maintenance while offering visual indicators for operational status and trip conditions.
Applications
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Low-voltage electrical distribution boards in industrial, commercial, and residential settings.
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Protection of motors and motor-driven equipment against overload, short-circuit, and leakage current.
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HVAC systems and pumps requiring earth-fault monitoring.
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Renewable energy systems with low-voltage motor-driven devices.
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Electrical panels requiring enhanced personnel protection and compliance with safety standards.
Product Advantages
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Comprehensive Protection – Combines thermal-magnetic tripping with residual current detection.
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Enhanced Safety – Protects personnel from electric shocks and equipment from overcurrent.
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Compact Design – Suitable for panels with space constraints.
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Durable Construction – Long operational lifetime with repeated operations.
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Visual Status Indicators – Provides clear ON/OFF and trip condition indications.
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Versatile Installation – Supports DIN rail and panel mounting for flexible integration.
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International Compliance – Conforms to IEC low-voltage safety standards.
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Low Maintenance – Designed for long-term reliability with minimal servicing.
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | ABB NBRC-51C |
| Rated Operational Voltage | 230/400 V AC |
| Rated Current | 10–50 A |
| Residual Current Sensitivity | 30 mA / 100 mA selectable |
| Tripping Characteristic | Class C, thermal-magnetic |
| Number of Poles | 2 or 4 |
| Breaking Capacity | 6–10 kA depending on variant |
| Mounting Type | DIN rail / Panel mount |
| Operating Temperature | -25°C to +60°C |
| Degree of Protection | IP20 |
| Dimensions (HxWxD) | 100 x 36 x 85 mm |
| Weight | 0.55 kg |
| Standards Compliance | IEC 61008 / IEC 60947-2 |
Recommended Related Models in NBRC Series
| Model | Rated Current (A) | Residual Current Sensitivity (mA) | Poles | Breaking Capacity (kA) | Weight (kg) | Dimensions (HxWxD mm) |
|---|---|---|---|---|---|---|
| NBRC-16C | 6–16 | 30 / 100 | 2 | 6 | 0.45 | 90 x 36 x 80 |
| NBRC-25C | 16–25 | 30 / 100 | 2 | 10 | 0.50 | 95 x 36 x 80 |
| NBRC-32C | 20–32 | 30 / 100 | 4 | 10 | 0.60 | 100 x 36 x 85 |
| NBRC-40C | 32–40 | 30 / 100 | 2 | 10 | 0.65 | 105 x 36 x 90 |
| NBRC-50C | 40–50 | 30 / 100 | 4 | 10 | 0.70 | 110 x 36 x 95 |
Recommended Popular ABB Models
| Model | Rated Current (A) | Poles | Breaking Capacity (kA) | Weight (kg) | Dimensions (HxWxD mm) |
|---|---|---|---|---|---|
| Emax 2 1600 | 1600 | 3 | 100 | 58 | 440 x 220 x 200 |
| Tmax XT1 630 | 630 | 3 | 50 | 25 | 350 x 200 x 180 |
| S203 C16 | 16 | 3 | 10 | 0.25 | 85 x 52.5 x 70 |
| S201 B10 | 10 | 1 | 6 | 0.12 | 80 x 17.5 x 70 |
| S404 M32 | 32 | 4 | 10 | 0.45 | 100 x 70 x 85 |
FAQ (10 Questions)
Q1: What type of protection does NBRC-51C provide?
A1: It provides thermal-magnetic overcurrent protection combined with residual current (earth fault) detection.
Q2: What is the rated current range?
A2: 10–50 A depending on the variant.
Q3: How many poles are available?
A3: 2-pole or 4-pole configurations are available.
Q4: What residual current sensitivities are available?
A4: 30 mA and 100 mA options.
Q5: Can it be mounted on a DIN rail?
A5: Yes, it supports DIN rail or panel mounting.
Q6: Is it suitable for industrial motor protection?
A6: Yes, it can protect low-voltage motors and motor-driven equipment.
Q7: What is the breaking capacity?
A7: 6–10 kA depending on variant.
Q8: What is the operating temperature range?
A8: -25°C to +60°C.
Q9: Does it provide visual trip indication?
A9: Yes, ON/OFF and tripped status is clearly indicated.
Q10: Which standards does it comply with?
A10: IEC 61008 and IEC 60947-2 standards for low-voltage protection.