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Siemens GMSG - User Manual

Siemens GMSG
68 pages
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Answers for energy.
Type GMSG 5 kV to 15 kV
vacuum circuit breaker
instruction manual
Installation operation maintenance E50001-F710-A231-X-4A00

Questions and Answers

  • R
    Rhonda MorrisAug 7, 2025
    Why won't the closing spring automatically charge on my Siemens GMSG?
    • M
      Michael OwensAug 7, 2025
      The closing spring may not automatically charge due to several reasons: * The secondary control circuit might be de-energized, or the control circuit fuses could be blown. In this case, check and energize the circuit, or replace the fuses if necessary. * The secondary disconnect contacts 15 or 16 might not be engaging. Check and replace them if required. * There could be damage to the wiring, terminals, or connectors. Inspect and repair as needed. * The charging motor (88) may have failed, requiring replacement. * The motor cut-off switch LS21 or LS22 might not be operating correctly. Replace it if necessary.
  • S
    Scott DavisAug 22, 2025
    What to do if Siemens GMSG Circuit breakers tripping coil energizes, tripping sound is heard, but circuit breaker contacts do not open?
    • M
      Michael MurphyAug 22, 2025
      If the tripping coil energizes and a tripping sound is heard, but the circuit breaker contacts do not open, one or more of the vacuum interrupters might be held closed. Check and replace them as necessary.
  • B
    baldwinchristinaAug 29, 2025
    What to do if Siemens Circuit breakers tripping coil (52T) energizes, no tripping sound is heard, and circuit breaker contacts do not open?
    • D
      Dr. Lisa GravesAug 29, 2025
      Check for improper protective relay logic.
  • D
    Daisy GillNov 14, 2025
    What to do if closing springs charge, but Siemens Circuit breakers do not close?
    • N
      Nathan BooneNov 14, 2025
      If the closing springs charge but the circuit breaker doesn't close, consider these potential causes: * The closing coil or solenoid (52SRC) may not be energizing due to a de-energized secondary control circuit or blown control circuit fuses. Correct the circuit or replace the fuses. * There might be no closing signal to secondary disconnect pin 13. Check for continuity and correct the protective relay logic. * The secondary disconnect contacts 13 or 15 might not be engaging. Inspect and correct as required. * The anti-pump relay (52Y) contacts 21 to 22, 31 to 32, or 13 to 14 could have failed. Check and replace them as needed. * The close coil (solenoid) (52SRC) might have failed. Check and replace it as required. * The auxiliary switch NC contacts 41 to 42 may be open when t...

Summary

Introduction

Hazardous Procedures

Outlines essential safety procedures for hazardous situations.

Field service operation and warranty issues

Information on obtaining technical support and warranty services.

Receiving, handling and storage

Shipping damage claims

Crucial steps for documenting and filing damage claims with the carrier.

Handling procedure

Details on safely handling and moving the circuit breaker and its components.

Installation checks and functional tests

De-energizing control power in switchgear

Steps to safely disconnect control power from the circuit breaker.

Spring-discharge check

Procedure to verify that the closing and tripping springs are discharged.

As-found and vacuum-integrity check tests

Tests to assess the breaker's current condition and vacuum seal.

Vacuum interrupter;operator

Vacuum interrupters

Explains the operating principle of the vacuum interrupter.

Stored-energy operating mechanism

Explains the mechanism that stores energy for closing and tripping.

Switching operation

Details the sequence of operations for closing and tripping.

Maintenance

Introduction and maintenance intervals

Importance of periodic inspections and maintenance intervals.

Recommended maintenance and lubrication

Overview of periodic maintenance and lubrication tasks.

Removal from switchgear

Steps for removing the breaker from switchgear for maintenance.

Vacuum-interrupter mechanical check

Describes mechanical checks for vacuum integrity.

Overhaul

Circuit breaker overhaul

Provides the recommended overhaul schedule for the circuit breaker.

Replacement at overhaul

Lists components to be replaced during overhaul.

Vacuum interrupter replacement

Information on replacing vacuum interrupters, with caveats for 63 kA models.

Maintenance and troubleshooting

Troubleshooting

Details common problems, symptoms, and remedies for the circuit breaker.

Siemens GMSG Specifications

General IconGeneral
BrandSiemens
ModelGMSG
CategoryCircuit breakers
LanguageEnglish

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