1. Electrical Parameters

• Rated Voltage: 100/110/120/220/240V AC
• Control Voltage Range: 20–265V AC/DC
• Making Capacity: 30A for 0.5s
• Sampling Frequency: 5Hz
• Response Time: 8 seconds
• RTD/Impedance Sensing Current:
  
• Maximum 4.2mA rms (100Ω platinum RTD)
• 6.2mA rms (10Ω copper conductor)

2. Protection Function Parameters

• Thermal Overload Protection: Based on thermal stress calculation, with optional speed switch interlocking.
• Phase-to-Phase Overcurrent Protection: Time-delay characteristic with speed switch interlocking for three-phase phase-to-phase overcurrent protection.
• Undercurrent (Loss of Load) Protection: Time-delay characteristic.
• Ground Fault Protection: Directionless ground fault protection with time-delay characteristic.
• Negative Sequence Protection: Inverse-time characteristic for three-phase unbalance and reverse phase sequence protection based on negative sequence current.
• Temperature Protection: Supports PTC thermistors and different types of RTD sensors, such as:
  
• 100Ω platinum TCR0.00385
• 120Ω nickel (US) TCR0.00672
• 108Ω copper TCR0.00427

3. Input/Output Parameters

• Measured Quantity Inputs: Six measured quantity inputs, with password protection selectable via the HMI to display electrical quantity information one at a time.
• Current Inputs: Four precise AC current inputs.
• Digital Inputs: Three additional electrically isolated digital inputs; the RTD module option includes two additional electrically isolated digital inputs.
• Signal Output Contacts:
  
• Two normally open/normally closed signal output contacts
• Three normally open heavy-duty output contacts, which can be freely combined for output contact functions according to actual working conditions.

4. Communication Parameters

• Communication Protocols: Supports SPA bus, IEC 60870-5-103, and Modbus (RTU and ASCII) communication protocols.
• Communication Interfaces:
  
• Front/back panel communication: selectable wireless or communication cable
• Backplane communication module: selectable plastic optical fiber or RS-485

5. Other Parameters

• Insulation: 2kV (input to protective ground)
• Electromagnetic Compatibility (EMC): Meets requirements of 1MHz burst interference test (Level III), electrostatic discharge test (Level IV), etc.
• Net Weight: Approximately 4 kg (estimated, as the specific net weight of C51HCNN02 was not found; reference similar model REM610C55HCNN02).