NB2-40ZT Smart Miniature Circuit Breaker

NB2-40ZT Smart Miniature Circuit Breaker

NB2-40ZT Smart Miniature Circuit Breaker

NB2-40ZT Smart Miniature Circuit Breaker

NB2-40ZT Smart Miniature Circuit Breaker

NB2-40ZT Smart Miniature Circuit Breaker

The CHINT NB2-40ZT Smart Miniature Circuit Breaker combines traditional circuit protection with intelligent control and monitoring capabilities. Designed for AC 50 Hz, 230 V circuits up to 40 A, it provides protection against overload, short circuit, over-voltage, and under-voltage. With built-in RS485/Bluetooth communication, remote control, and real-time monitoring, it supports energy management, fault diagnosis, and system automation. Compact and efficient, the NB2-40ZT is ideal for smart homes, offices, and industrial control systems.

Product Information

Standards Compliance: IEC/EN 60898-1
Certifications: CE, RoHS, REACH
Rated Current (In): 6 A, 10 A, 16 A, 20 A, 25 A, 32 A, 40 A
Poles: 1P
Rated Voltage (Ue): 230 V AC
Rated Frequency: 50 Hz
Thermo-Magnetic Characteristic: Type C curve
Rated Breaking Capacity (Icn): 6 kA
Rated Insulation Voltage (Ui): 690 V
Rated Impulse Withstand Voltage (Uimp): 4 kV
Dielectric Test Voltage: 2 kV (1 min)
Reference Temperature: 30 °C
Ambient Operating Temperature: –25 °C to +70 °C
Storage Temperature: –40 °C to +70 °C
Applicable Altitude: ≤ 2000 m
Protection Functions:
- Overload and short-circuit protection
- Over-voltage protection: Action threshold 280 V ±5 V
- Over-voltage recovery threshold: 250 V ±5 V
- Under-voltage protection: Action threshold 165 V ±5 V
- Under-voltage recovery threshold: 190 V ±5 V
- Non-driving time: ≥ 3 s (over/under voltage)
- Recovery time: ≥ 10 s (over/under voltage)
Electrical Parameter Measurement Function:
- Current measurement: ±1.0% (1 A ≤ I < 0.1 In)
- Voltage measurement: ±0.5% (0.9 Ue ≤ U ≤ 1.1 Ue)
- Power measurement: ±1.5%
Communication Functionality:
- Protocol: Modbus-RTU
- Interfaces: RS485, Bluetooth BLE 5.0 (compatible with BLE 4.0–4.2)
- Automatic networking via SMG (Smart Gateway)
Mechanical and Electrical Life:
- Mechanical Life: 10,000 operations
- Electrical Life: 6,000 operations
Installation and Construction:
- Mounting: DIN rail (TH35-7.5, standard)
- Connection: From top (cable/pin-type busbar)
Terminal Capacity:
- Minimum: 1 mm²
- Maximum: 16 mm²
Tightening Torque: 2.5 N·m
Flame Retardant Grade: V-0
Pollution Degree: 2
Protection Degree: IP20
Assembled Accessories: None
Dimensions (mm): 78 × 18 × 49.5

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NB2-40ZT-MCB-Catalog.pdf

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2025-12-15

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2306-NB2-40ZT-MCB-Manual EN.pdf

3.82MB

2024-09-22

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2405-NB2-40ZT-MCB- REACH Declaration Certificate.pdf

387.82KB

2024-09-22

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2308-NB2-40ZT-MCB-CE RoHS Declaration Certificate.pdf

287.69KB

2024-09-22

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2305-NB2-40ZT-MCB-CB Certificate.pdf

569.26KB

2024-09-22

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2304-NB2-40ZT-MCB-CE Certificate.pdf

649.63KB

2024-09-22

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NB2-40ZT-MCB-Drawing-1P-3D.stp

7.08MB

2024-09-22

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FAQs

What makes the NB2-40ZT a “smart” circuit breaker?

It integrates digital communication, remote control, and energy monitoring into a traditional MCB, allowing real-time supervision and control via RS485 or Bluetooth.

How does it enhance safety compared to standard MCBs?

It offers multi-layered protection — including overload, short-circuit, over/under-voltage, and phase open protection, ensuring comprehensive electrical safety.

Can the NB2-40ZT be controlled remotely?

Yes. Through RS485 or Bluetooth, it can be switched ON/OFF or reset remotely and integrated with CHINT smart platforms.

What type of loads is the NB2-40ZT suitable for?

It uses a Type C tripping curve, ideal for resistive and inductive loads such as lighting, HVAC, and motor-driven circuits.

Can it replace a conventional MCB in existing panels?

Yes. Its standard 18 mm width and DIN rail compatibility make it a drop-in replacement for conventional MCBs, adding smart functionality without extra space requirements.