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General| Rated Voltage | 12 kV |
|---|---|
| Rated Frequency | 50/60 Hz |
| Mechanical Life | 10, 000 operations |
| Operating Mechanism | Spring-operated |
| Standards | IEC 62271-100 |
| Insulation Medium | SF6 |
| Rated Short-Circuit Breaking Current | 25 kA |
Details the construction and versions of the circuit-breakers, including standards.
Lists the standard components included in the basic circuit-breaker configuration.
Explains the ESH operating mechanism, spring loading, and remote operation capabilities.
Describes the fixed version, its supports, terminal box, and earthing screw.
Details plug-in types for UniSwitch/UniAir, their characteristics, and racking positions.
Explains the SF6 gas pressure monitoring device and its available configurations.
Provides detailed technical specifications for fixed HD4/R circuit-breakers across various voltage ratings.
Presents technical specifications for fixed HD4/S circuit-breakers used in UniSwitch switchgear.
Details technical specifications for fixed HD4/UniMix circuit-breakers used in UniMix switchgear.
Provides technical specifications for fixed HD4/UniAir circuit-breakers used in UniAir switchgear.
Lists technical specifications for fixed HD4/R-SEC circuit-breakers used in UniSec switchgear.
Provides critical safety warnings regarding installation, handling, and operations outside the switchgear.
Identifies and labels the key operating and signalling components on the circuit-breaker.
Details manual and electrical operation procedures, including spring loading.
Explains how to perform the closing operation using the closing pushbutton, including remote control.
Details how to perform the opening operation using the opening pushbutton and remote control.
Emphasizes the importance of correct installation and the need for qualified personnel.
Specifies the environmental conditions required for proper installation and operation.
Outlines initial steps before installation, such as cleaning and checking terminals.
Provides instructions for mounting and fixing the circuit-breaker in place.
Describes the installation process for plug-in circuit-breakers within switchgear.
Covers general recommendations, dimensions, surface treatment, and assembly of power connections.
Provides guidance on ensuring clean, properly sized, and supported power connections.
Specifies dimensional requirements for connections on fixed HD4/R circuit-breakers.
Recommends surface treatment for connection contacts, preferably silver-plating.
Details procedures for preparing and assembling electrical connections to the terminals.
Explains the process for earthing fixed version circuit-breakers using the designated screw.
Describes how to connect auxiliary circuits for both fixed and plug-in breakers.
Shows detailed dimensions for fixed HD4/R circuit-breakers at 12-24 kV, 630-1250 A.
Displays dimensions for fixed HD4/R circuit-breakers, likely a different configuration or view.
Presents dimensional drawings for fixed HD4/R circuit-breakers at 36 kV.
Provides dimensional drawings for plug-in HD4/S circuit-breakers.
Shows dimensional drawings for HD4/Uniair circuit-breakers.
Details dimensions for HD4/Uniair-F circuit-breakers.
Presents dimensional drawings for HD4/Uniair-2R circuit-breakers.
Provides dimensional drawings for HD4/Uniair-A circuit-breakers.
Shows dimensional drawings for HD4/UniMix-F circuit-breakers.
Displays dimensional drawings for HD4/R-SEC circuit-breakers.
Outlines essential procedures and checks before putting the circuit-breaker into service.
Explains the maintenance-free nature and factors influencing inspection frequency.
Provides a schedule of inspections, frequency, and criteria for routine checks.
Lists common faults, their possible causes, and suggested inspections/remedies.
Lists various spare parts and accessories available for the circuit-breaker.
