Siemens SGIM-3268H User Manual (English)

Questions and Answers:

N
Noah MartinezAug 1, 2025
What to do if Siemens Circuit breakers will not trip?
- B
  Brenda LopezAug 1, 2025
  If your Siemens Circuit breaker won't trip, here are a few things to check: * Make sure the secondary control power is energized and the control power fuses are intact. * Inspect wiring, terminals, and connectors for any damage and repair if needed. * Verify there's a tripping signal to secondary disconnect contact 1, checking for continuity and correcting relay logic. * Ensure secondary disconnect contacts 1 or 2 are properly engaging; replace if necessary. * Check the trip coil (52T) and replace it if it has failed. * Confirm that auxiliary switch NO contacts 1-2 or 5-6 are not open when the breaker is closed; adjust or replace the linkage and switch as needed.
S
Sandra RogersAug 6, 2025
Why Siemens SGIM-3268H breaker fails to close?
- N
  Nancy WellsAug 6, 2025
  If a Siemens Circuit breaker fails to close, consider the following potential causes: * The secondary control circuit might be de-energized, or the control circuit fuses may be blown. Check and energize the circuit or replace the fuses if necessary. * The secondary disconnect contacts 15 or 16 may not be engaging. Check and replace them if required. * There might be damage to the wiring, terminals, or connectors. Inspect and repair as necessary. * The charging motor (88) could have failed. Check the brushes and replace them if needed. * The motor cut-off switch (LS1) might have failed to operate. Replace it if necessary. * There could be a mechanical failure of the operating mechanism. In this case, it's best to refer to the factory or an authorized service shop.
P
Paul LopezAug 14, 2025
What causes Siemens SGIM-3268H to have a nuisance or false close?
- G
  George GutierrezAug 14, 2025
  A nuisance or false close in Siemens Circuit breakers can be caused by: * A nuisance or false closing signal to secondary disconnect contact 13. Check the relay logic and correct as required. * The closing coil (52SRC) terminal 2 being shorted to ground. Check to determine if the problem is in the wiring or the coil, and correct as required.
M
mtaylorAug 18, 2025
What causes Siemens Circuit breakers to have a nuisance or false trip?
- A
  Amy PerryAug 18, 2025
  A nuisance or false trip of Siemens Circuit breakers can occur if the tripping signal remains energized. Check for improper relay logic.
B
Barbara CantuAug 23, 2025
What to do if Siemens SGIM-3268H tripping coil (52T) energizes. Tripping sound is heard, but breaker contacts do not open?
- C
  Crystal RileyAug 23, 2025
  If the Siemens Circuit breakers tripping coil (52T) energizes and a tripping sound is heard, but the breaker contacts do not open, it could be due to: * Mechanical failure of the operating mechanism. Check and contact the factory or authorized service shop. * One or more of the vacuum interrupters being held closed. Check and replace as necessary.
K
Katelyn MontoyaAug 27, 2025
What to do if Siemens Circuit breakers tripping coil (52T) energizes, but no tripping sound is heard, and breaker contacts do not open?
- C
  Christopher McneilAug 27, 2025
  If the Siemens Circuit breakers tripping coil (52T) energizes, but no tripping sound is heard, and the breaker contacts do not open, it may be due to: * Failure of the tripping spring or its mechanical linkage. Check and replace if required.

Siemens SGIM-3268H Specifications

General

Tripping characteristic	C
Mounting type	DIN rail
Voltage	400 V
Poles	3
Rated voltage	400 V AC
Number of poles	3
Standards	IEC 60947-2

Summary

Introduction and Safety

Introduction

Overview of breaker design and manual purpose.

Signal Words

Defines hazard signal words like Danger, Warning, and Caution.

Dangerous Procedures

Lists critical safety procedures to follow during operation.

Field Service Operation

Information on obtaining technical assistance from Siemens Field Service.

Receiving, Handling and Storage

Introduction

Explains manual's scope for separate shipment handling.

Receiving Procedure

Steps for inspecting shipping containers and checking for damages.

Shipping Damage Claims (When Applicable)

Procedure for reporting and processing shipment damage claims.

Handling Procedure

Guidelines for safely lifting and moving circuit breakers to prevent damage.

Storage Procedure

Recommendations for storing circuit breakers to maintain condition.

Indoor Storage

Specifies conditions for clean, dry storage environments.

Outdoor Storage

Outlines protective measures required for outdoor storage.

Space Heating

Importance of space heating for storage to prevent condensation.

Installation Checks and Initial Functional Tests

Introduction

Describes inspections, checks, and tests before circuit breaker operation.

Inspections, Checks and Tests without Control Power

Verifying the discharged state of spring mechanisms before applying control power.

De-Energizing Control Power in Switchgear

How to safely disconnect control power to the circuit breaker.

Spring Discharge Check

Procedure to ensure both tripping and closing springs are fully discharged.

Removal from Lower Cell in Indoor (if not on raised pad) and Shelter-Clad Outdoor Switchgear

Steps for removing breakers from lower cells or shelter-clad outdoor switchgear.

Removal from Upper Cell (Indoor and Shelter-Clad Outdoor Switchgear)

Steps for removing breakers from upper cells in two-high assemblies.

Removal from Upper and Lower Cell in Outdoor Non-Walk In Enclosures or for Indoor Switchgear Installed on a Raised Pad

Procedures for removing breakers from outdoor or raised indoor enclosures.

Physical Inspections

Visual checks for breaker compatibility, cleanliness, and shipping damage.

Manual Spring Charging Check

Performing manual spring charging and verifying spring status.

As-Found and Vacuum Integrity Check Tests

Performing insulation and vacuum integrity tests for baseline data.

Automatic Spring Charging Check

Verifying automatic spring charging functionality.

Interrupter/Operator Description

Introduction

Overview of GMI circuit breaker operation and subassemblies.

Vacuum Interrupters and Primary Disconnects

Explains the operating principle of vacuum interrupters and their components.

Primary Disconnects and Phase Barriers

Details primary disconnects, fingers, and phase barrier configurations for insulation.

Stored Energy Operating Mechanism

Explains the integrated system of springs, solenoids, and mechanisms.

Modes of Operation - Mid-1991 and After

Describes operational modes for mechanisms manufactured after mid-1991.

Modes of Operation Discussion

Explains the five status conditions of the stored energy operating mechanism.

Spring Charging Mode

Details the process of charging the closing springs manually or electrically.

Opening Mode

How vacuum interrupter contacts are opened or tripped.

Rapid Auto-Reclosing Mode (Optional)

Describes the automatic recharging capability for rapid reclosing duty.

Modes of Operation - Up to Mid-1991

Describes operational modes for mechanisms manufactured before mid-1991.

Closing Mode

Explains the electrical or manual process of closing the circuit breaker contacts.

Trip Free Mode

How the breaker can be tripped during closing operations.

Closing and Opening Springs

Details the stored energy springs and their connection to charging devices.

Trip Free Operation

Explains the breaker's ability to trip before, during, or after closing.

Damper Assembly

Describes the viscous damper's role in limiting overtravel of movable contacts.

Damper (used with type VS-15050 vacuum interrupters)

Specific details for dampers used with VS-15050 interrupters.

Manual Spring Charging

Procedure for charging springs using a lever instead of the motor.

Spring Charging Motor

Information on the universal motor used for automatic spring charging.

Close Solenoid, Trip Solenoid and Anti-Pump Relay

Explains the function of solenoids and the anti-pump relay.

Secondary Disconnect

Details the connection of control power and signals via contact fingers.

Auxiliary Switch

Describes the auxiliary switch providing contacts for control and logic.

MOC (Mechanism Operated Cell) Switch

Explains the MOC switch for control flexibility in test/connect positions.

TOC (Truck Operated Cell) Switch

Describes the TOC switch operated by racking for position indication.

Limit Switches

Explains the function of motor cutoff and spring charged switches.

Standard Schematic Diagrams

Refers to diagrams showing control logic for various functions.

Capacitor Trip Device (Optional)

Describes an optional device for storing energy for tripping.

Undervoltage Release (Optional)

Optional release for monitoring trip supply voltage and causing trip.

Description of Operation

Explains the operation of the undervoltage release assembly.

Interlocks

Details safety interlocks preventing unsafe operating conditions.

Trip-Free Interlock

Ensures the breaker is not closed unless in the correct position.

Rating Interlock

Prevents inserting a lower-rated breaker into a higher-rated cubicle.

Circuit Breaker Frame

Highlights key features of the frame like ground disconnect and wheels.

Ground Disconnect

Describes the contact that engages the switchgear ground bar.

Circuit Breaker Handling Wheels

Information on wheels for moving the circuit breaker.

Racking Mechanism

Explains the mechanism used to move the breaker between positions.

Maintenance

Introduction and Maintenance Intervals

Essential periodic inspections and recommended maintenance intervals.

Recommended Hand Tools

List of tools required for disassembly and reassembly procedures.

Recommended Maintenance and Lubrication

Details tasks and procedures for maintenance and lubrication.

Removal from Switchgear

Steps required to safely remove the circuit breaker from switchgear.

Checks of the Primary Power Path

Verifying cleanliness and condition of vacuum interrupters and disconnects.

Cleanliness Check

Instructions for cleaning breaker components with lint-free cloth.

Inspection of Primary Disconnects

Checking primary disconnect fingers for burning, pitting, and damage.

Checks of the Stored Energy Operator Mechanism

Mechanical and electrical checks of the operator mechanism for proper function.

Maintenance and Lubrication

Procedures for cleaning and lubricating the stored energy operator mechanism.

Fastener Check

Inspecting all fasteners for tightness and condition.

Manual Spring Charging and Contact Erosion Checks

Performing manual charging and checking vacuum interrupter contact wear.

Damper Assembly Check (for circuit breakers equipped with all vacuum interrupters except type VS-15050)

Checking the damper assembly for tightness and greasing.

Damper Assembly Check (for circuit breakers equipped with type VS-15050 vacuum interrupters)

Specific checks for VS-15050 damper assembly.

Electrical Control Checks

Verifying absence of damage and proper operation of electrical controls.

Check of the Wiring and Terminals

Inspecting wiring for damage and terminals for secure attachment.

Check of the Secondary Disconnect

Ensuring secondary disconnect fingers move freely and have spring force.

Automatic Spring Charging Check — Control Power Required

Verifying automatic spring charging with control power applied.

Electrical Close and Trip Check – Control Power Required

Checking control circuits for proper closing and tripping operations.

Checks of the Spring Charging Motor

Notes on spring charging motor brush replacement intervals.

High-Potential Tests

Introduction to high voltage tests for insulation and vacuum integrity.

Vacuum Integrity Check

Performing a high potential test to verify vacuum integrity.

High Potential Test Voltages

Lists voltage values for high potential tests based on equipment rating.

Vacuum Integrity Test Procedure

Step-by-step guide for performing vacuum integrity tests.

As-Found Insulation and Contact Resistance Tests

Tests to verify insulation system integrity and establish baseline data.

Insulation and Contact Resistance Test Equipment

Lists equipment needed for insulation and contact resistance tests.

Insulation and Contact Resistance Test Procedure

Procedure for conducting insulation and contact resistance tests.

Inspection and Cleaning of Circuit Breaker Insulation

Cleaning barriers and post insulators using specified solvents.

Functional Tests

Performing manual and automatic spring charging checks.

Overhaul

Introduction

Guide for identifying and correcting circuit breaker malfunctions.

Circuit Breaker Overhaul

Recommended overhaul schedule based on operating conditions.

Replacement at Overhaul

Lists components typically replaced during overhaul.

Replacement of Closing Springs

Procedure for relieving tension and replacing closing springs.

Replacement of Opening Spring

Steps for removing and replacing the opening spring assembly.

Replacement of Closing and Tripping Solenoids (Devices 52SRC and 52T)

How to replace closing and tripping solenoids using mounting screws.

Replacement of Anti-Pump Relay (Device 52Y)

Procedure for removing and replacing the anti-pump relay.

Replacement of the Auxiliary Switch

Steps for replacing the auxiliary switch and its components.

Replacement of Motor Cut-Off Switch (Device LS1) and Spring Charged Switch (LS2)

Procedure for replacing the common assembly of LS1 and LS2 switches.

Replacement of Trip Latch Reset Check Switch (Device LS3)

Instructions for replacing the LS3 switch based on mechanism vintage.

Replacement of LS3 - Up to Mid-1991

Specific steps for replacing the LS3 switch on older mechanisms.

Replacement of Damper Assembly (for circuit breakers with all vacuum interrupters except type VS-15050)

Steps for replacing the damper assembly on most circuit breakers.

Replacement of Damper Assembly (for circuit breakers equipped with type VS-15050 vacuum interrupters)

Specific replacement procedure for VS-15050 damper assembly.

Replacement of Spring Charging Motor (Device 88)

Steps for removing and replacing the spring charging motor.

Replacement of Primary Disconnect Fingers

Procedure for replacing burnt or broken primary disconnect fingers.

Replacement of Vacuum Interrupters

Procedures for removing and replacing vacuum interrupters, emphasizing care.

Preparation

Steps to identify interrupter type and prepare for replacement.

Vacuum Interrupter Removal

Detailed steps for safely removing vacuum interrupters.

Stationary Contact Assembly

Instructions for assembling stationary contacts with various interrupter types.

Trunnion and Movable Contact Adjustment

Procedure for adjusting the trunnion and movable contact for proper stroke.

Open Stroke Adjustment

Setting the correct gap for the open position of the movable contact.

Periodic Maintenance and Lubrication Tasks

A table summarizing maintenance tasks and inspection points by sub-assembly.

Troubleshooting

Breaker fails to close

Identifies symptoms and potential causes for failure to close.

Nuisance or false close

Addresses issues causing unintended closing actions.

Circuit breaker will not trip

Lists causes for the breaker failing to trip when commanded.

Nuisance or false trip

Addresses issues causing unintended tripping actions.

Appendix

Table A-1A - Type GMI Circuit Breaker Ratings (Historic "Constant MVA" Rating Basis)

Historical rating data for GMI circuit breakers based on MVA.

Table A-1B - Type GMI Circuit Breaker Ratings (New "Constant kA" Rating Basis)

Current rating data for GMI circuit breakers based on kA.

Table A-2 - 5kV, 7.2kV and 15kV Type GMI Circuit Breaker Control Data

Control data including coil and motor characteristics.

Table A-3 - Interrupting Capacity Auxiliary Switch Contacts

Interrupting capacity ratings for various auxiliary switch contacts.

Table A-4 – Circuit Breaker Weights [lbs (kg)]

Weight specifications for different GMI circuit breaker models.

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Siemens SGIM-3268H User Manual

Table of Contents

Questions and Answers:

Siemens SGIM-3268H Specifications

Summary

Introduction and Safety

Introduction

Signal Words

Dangerous Procedures

Field Service Operation

Receiving, Handling and Storage

Introduction

Receiving Procedure

Shipping Damage Claims (When Applicable)

Handling Procedure

Storage Procedure

Indoor Storage

Outdoor Storage

Space Heating

Installation Checks and Initial Functional Tests

Introduction

Inspections, Checks and Tests without Control Power

De-Energizing Control Power in Switchgear

Spring Discharge Check

Removal from Lower Cell in Indoor (if not on raised pad) and Shelter-Clad Outdoor Switchgear

Removal from Upper Cell (Indoor and Shelter-Clad Outdoor Switchgear)

Removal from Upper and Lower Cell in Outdoor Non-Walk In Enclosures or for Indoor Switchgear Installed on a Raised Pad

Physical Inspections

Manual Spring Charging Check

As-Found and Vacuum Integrity Check Tests

Automatic Spring Charging Check

Interrupter/Operator Description

Introduction

Vacuum Interrupters and Primary Disconnects

Primary Disconnects and Phase Barriers

Stored Energy Operating Mechanism

Modes of Operation - Mid-1991 and After

Modes of Operation Discussion

Spring Charging Mode

Opening Mode

Rapid Auto-Reclosing Mode (Optional)

Modes of Operation - Up to Mid-1991

Closing Mode

Trip Free Mode

Closing and Opening Springs

Trip Free Operation

Damper Assembly

Damper (used with type VS-15050 vacuum interrupters)

Manual Spring Charging

Spring Charging Motor

Close Solenoid, Trip Solenoid and Anti-Pump Relay

Secondary Disconnect

Auxiliary Switch

MOC (Mechanism Operated Cell) Switch

TOC (Truck Operated Cell) Switch

Limit Switches

Standard Schematic Diagrams

Capacitor Trip Device (Optional)

Undervoltage Release (Optional)

Description of Operation

Interlocks

Trip-Free Interlock

Rating Interlock

Circuit Breaker Frame

Ground Disconnect

Circuit Breaker Handling Wheels

Racking Mechanism

Maintenance

Introduction and Maintenance Intervals

Recommended Hand Tools

Recommended Maintenance and Lubrication

Removal from Switchgear

Checks of the Primary Power Path

Cleanliness Check

Inspection of Primary Disconnects

Checks of the Stored Energy Operator Mechanism

Maintenance and Lubrication

Fastener Check

Manual Spring Charging and Contact Erosion Checks

Damper Assembly Check (for circuit breakers equipped with all vacuum interrupters except type VS-15050)