CHINT NB2-40ZT Smart Miniature Circuit Breaker

CHINT NB2-40ZT Smart Miniature Circuit Breaker,
combines traditional circuit protection with intelligent control and monitoring capabilities.
Designe 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.

• 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