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- NBIO-21CU/NBIO-21C
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- Sweden
- 90 x 36 x 78 mm
- 0.38kg
- 3BHB011947R0121/3BSE017427R1
- Xiamen, China
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Product Overview: ABB NBIO-21CU / NBIO-21C (3BHB011947R0121 / 3BSE017427R1)
Brand
Series
NBIO Series (Thermal-Magnetic Circuit Breakers / Motor Protection)
Product Description
The ABB NBIO-21CU / NBIO-21C (3BHB011947R0121 / 3BSE017427R1) is a thermal-magnetic circuit breaker designed to provide precise and reliable protection for low-voltage circuits, including motors and electrical distribution systems. The “CU” designation indicates the inclusion of a built-in auxiliary contact for signaling or control integration, whereas the standard NBIO-21C provides the basic circuit protection function.
This device is engineered with a combination of thermal overload and instantaneous magnetic protection, ensuring sensitive yet robust safeguarding against short circuits and overloads. Its compact modular design allows seamless integration into electrical panels, motor control centers, and industrial switchgear, while maintaining compliance with international low-voltage protection standards.
The NBIO-21CU / NBIO-21C ensures safe operation, long service life, and minimal maintenance requirements, making it ideal for a wide range of industrial, commercial, and residential applications.
Applications
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Low-voltage electrical circuits in commercial, residential, and industrial buildings.
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Motor protection for pumps, compressors, fans, and conveyor systems.
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Control and distribution panels in manufacturing plants and production lines.
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HVAC systems and associated motor-driven equipment.
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Integration with monitoring or control systems via auxiliary contacts (CU variant).
Product Advantages
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Dual Protection – Thermal overload and magnetic short-circuit protection ensure reliable safeguarding.
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Auxiliary Contact Option – NBIO-21CU allows remote status signaling for monitoring and control.
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Compact Design – Optimized for tight panel spaces and modular installation.
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Long Operational Life – Designed for repeated operations with low maintenance.
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Versatile Installation – Supports DIN rail or panel mounting for flexible deployment.
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Visual Status Indication – Clear ON/OFF/trip indicator for easy diagnostics.
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International Compliance – Conforms to IEC standards for low-voltage protection.
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Flexible Current Range – Suitable for small and medium motor applications and low-voltage circuits.
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | ABB NBIO-21CU / NBIO-21C |
| Part Number | 3BHB011947R0121 / 3BSE017427R1 |
| Rated Operational Voltage | 240/415 V AC |
| Rated Current | 1–20 A |
| Tripping Characteristic | Class C, thermal-magnetic |
| Number of Poles | 2 |
| 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) | 90 x 36 x 78 mm |
| Weight | 0.38 kg |
| Auxiliary Contact | Included in CU variant, not in standard NBIO-21C |
| Standards Compliance | IEC 60898 / IEC 60947-2 |
Recommended Related Models in NBIO Series
| Model | Rated Current (A) | Poles | Breaking Capacity (kA) | Weight (kg) | Dimensions (HxWxD mm) |
|---|---|---|---|---|---|
| NBIO-10C | 1–10 | 1 | 6 | 0.18 | 85 x 17.5 x 70 |
| NBIO-16C | 6–16 | 2 | 10 | 0.40 | 90 x 35 x 75 |
| NBIO-25C | 16–25 | 2 | 10 | 0.45 | 100 x 36 x 80 |
| NBIO-32C | 20–32 | 2 | 10 | 0.50 | 105 x 36 x 85 |
| NBIO-40C | 32–40 | 2 | 10 | 0.55 | 110 x 36 x 90 |
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 is the difference between NBIO-21CU and NBIO-21C?
A1: NBIO-21CU includes an auxiliary contact for remote monitoring or control, whereas NBIO-21C does not.
Q2: What is the rated current range?
A2: Both models support 1–20 A.
Q3: How many poles do these breakers have?
A3: They have 2 poles.
Q4: Can they be mounted on DIN rails?
A4: Yes, they support DIN rail and panel mounting.
Q5: What protection do these devices provide?
A5: Thermal overload protection and instantaneous magnetic short-circuit protection.
Q6: Are they suitable for motor protection?
A6: Yes, they protect small to medium motors, such as pumps and fans.
Q7: What is the breaking capacity?
A7: The rated breaking capacity is 6–10 kA depending on the variant.
Q8: Do they operate in a wide temperature range?
A8: Yes, -25°C to +60°C.
Q9: Is there visual status indication?
A9: Yes, both models clearly indicate ON/OFF and tripped conditions.
Q10: Are these breakers compliant with international standards?
A10: Yes, they meet IEC 60898 and IEC 60947-2 standards.