Category Parameter Specification / Value Remarks Switchgear Platform Model & Type UniGear ZS1 Air-insulated, metal-clad, withdrawable Rated Voltage (Uₐ) 12 kV / 17.5 kV / 24 kV Standard for ZS1 platform. Project-specific. Rated Frequency 50 Hz / 60 Hz Project-specific. Insulation Level 24 kV / 28 kV / 36 kV (Power freq.) 60 kV / 75 kV / 95 kV (Impulse) Corresponds to 12/17.5/24 kV ratings. Primary Equipment Circuit Breaker Type Vacuum Circuit Breaker (VCB) Typically ABB VD4 series or equivalent. Rated Normal Current (Iₐ) 1250 A Continuous current rating for main busbar and breaker. Rated Short-Circuit Breaking Current (Iₖ) 25 kA Symmetrical breaking capacity at rated voltage. Rated Short-Time Withstand Current (Iₖ) 25 kA (3 s) Thermal withstand capability. Mechanical Endurance 30,000 operations Typical for VCB in this class. Withdrawal Type Fixed Breaker (Disconnectable) Code "B": Fixed, but can be isolated. Protection & Control Relay Type REF615 Feeder Protection Relay Multi-function digital protection IED. Protection Functions Overcurrent, Earth Fault, Thermal, Voltage, etc. As per REF615's "AG" variant configuration. Communication Protocols IEC 61850-8-1 (MMS/GOOSE), IEC 60870-5-103, Modbus Standard for REF615 relay. Instrument Transformers Current Transformers Quantity: 2 Sets (Cores) Accuracy Class: Typically 5P20 for protection Code "B". Specific ratio (e.g., 2000/1A) defined in project drawings. Voltage Transformers None Code "N". Auxiliary Supplies Control & Protection Supply 110 V DC Code "N". Standard for substation battery systems. Heating & Lighting Supply 230 V AC, 1-phase, 50/60 Hz Code "A". Space Heater Power Typically 100 - 300 W Dependent on cubicle size and climate class. Mechanical & Safety Degree of Protection (IP) IP4X (Internal compartment) IP2X / IP3X (Front) Standard for UniGear ZS1. Internal Arc Classification (IAC) IAC AFLR (Optional) If specified for the project. Earthing Switch Included Standard for feeder panels. Shutters Automatic, self-closing For busbar and cable compartment safety. Mechanical Interlocks Full 5-point interlocking Prevents incorrect operations. Connections Busbar System Single Busbar Standard for ZS1. Cable Connection Standard (Bottom entry) Code "A1". For single-core or 3-core cables. Cable Termination Suitable for up to 240 mm² (Cu) / 300 mm² (Al) Typical maximum. Physical & Environmental Panel Dimensions (H x W x D) Approx. 2300 x 800 x 1700 mm (Typical) Exact dimensions in project drawings. Weight Approx. 1000 - 1300 kg Fully equipped. Operating Temperature -5°C to +40°C (Standard indoor) For normal service. Paint / Finish RAL 7035 (Light Grey) Code "D". Standard color. Special Notes Configuration Note "X" denotes special version Indicates non-standard modifications per customer requirements.