Technical Specifications

Core Protection & Control Components

Current Transformer (CT)

Accurate load monitoring and over-current protection

Voltage Transformer (PT)

Precise voltage measurement for protection relays

Isolation Switch

Visible disconnection for maintenance safety

AC Contactor

Remote-controlled circuit switching

Protection Relays

Current/voltage/intermediate relay coordination

Control Interface

Meters, buttons, and indicator lamps for operation

Primary Functions

• Circuit Isolation - Physical disconnection capability

• Remote Operation - AC220V controlled switching

• Over-Voltage Protection - Adjustable voltage relay settings

• Over-Current Protection - Instantaneous and timed tripping

• Measurement & Indication - Real-time electrical parameter monitoring

• Ground Fault Protection - Integrated ground switch

Key Performance Features

High Fault Tolerance

16kA short-circuit current rating for system stability

EMI Protection

Shielded enclosure prevents electromagnetic interference

Precision Instrumentation

Class 1.0 CTs and 0.5% accuracy PTs

Safety-First Design

Mechanical interlocks prevent unsafe operations

Industrial Applications

• Steel plant main distribution boards

• Industrial process control centers

• Large pump station power control

• Manufacturing plant transformer secondaries

• High-capacity compressor power management

Design & Safety Standards

• IEC 61439-1/2: Low-voltage switchgear assemblies

• IEC 62271-200: Metal-enclosed switchgear

• IEC 61869: Instrument transformer standards

• IEC 60255: Protection relay requirements

• Clearance/Creepage: 25mm/kV (per IEC 60664)

• Partial discharge: < 5pC at 1.1Ur

Installation & Commissioning

Site Requirements

• Concrete foundation: Min. 150mm thickness

• Clearances: 800mm front, 300mm sides/rear

• Ambient temperature: -5°C to +45°C

• Relative humidity: < 90% non-condensing

Commissioning Tests

• Primary injection testing at 100% rated current

• Dielectric strength test at 3kV AC for 1 min

• Relay calibration and trip timing verification

• Contactor operation cycle test (10 operations)

Maintenance Protocol