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Siemens SENTRON 3VL400 - User Manual

Siemens SENTRON 3VL400
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System Manual
SENTRON
Protection devices
3VL IEC molded case circuit breakers
11/2013Edition
Answers for Infrastructure & Cities.

Table of Contents

Questions and Answers

  • C
    cruzmistyAug 9, 2025
    Why does my Siemens SENTRON 3VL400 circuit breaker keep tripping due to overload?
    • F
      fmendezAug 9, 2025
      If your Siemens Protection Device circuit breaker trips due to overload, it indicates the circuit breaker is working as intended. First, verify if the operating current exceeds the thermal tripping limit. Inspect the terminals for discoloration, as cables may loosen due to vibration or cold flow. High ambient temperatures can also cause tripping; consider derating the In or IR values if temperatures in enclosures are too high. Finally, if none of the above apply, inspect the overcurrent release for discoloration and ensure tightening torque values are correct.
  • J
    Jeremiah ManningAug 18, 2025
    What to do if Siemens SENTRON 3VL400 Protection Device circuit breaker trips due to short-circuit?
    • E
      Evan WalkerAug 18, 2025
      If the Siemens Protection Device circuit breaker trips because of a short-circuit, it could be due to excessive making current, such as from a motor. Try adjusting the magnetic trip rating to a higher setting until the breaker stops tripping when the motor starts. High current peaks, like those during star-delta starter transitions, can also cause this. In such cases, the short-circuit release "I" must be set to a higher value; however, note that this might reduce motor protection.
  • X
    xmendezDec 1, 2025
    Why are the mechanical and electrical functions of my Siemens SENTRON 3VL400 affected?
    • S
      Scott YoungDec 1, 2025
      If the mechanical and electrical functions of your Siemens Protection Device are affected, high humidity or corrosion could be the cause. The molded case circuit breakers must not be used in environments with high humidity since this can cause dielectric and insulation problems. In such environments, appropriate measures need to be taken, such as placing the circuit breaker in an enclosure. Also, the molded case circuit breakers are not designed to be used in aggressive environments and should be installed in a housing. If the issue relates to internal accessories, determine the type installed by removing the circuit breaker cover and checking the order number. Then, verify their correct function. Ensure the correct voltage is connected to the undervoltage release, and that voltage is not ...

Summary

Product description

Overview 3 VL

Introduces the SENTRON VL types and their basic characteristics.

Application overview

Configuration

Explains the functional principles and subdivision of circuit breakers.

Mechanical operating mechanisms

Motorized operating mechanisms (optional)

Functions

Protection functions

Details on overcurrent, differential current, and ground-fault protection.

Internal accessories

Describes available internal accessories like releases and switches.

Application planning

Use in motor protection

Details on protecting motors with circuit breakers.

Installing;mounting

Installation methods

Overview of fixed-mounted, plug-in, and withdrawable installation methods.

Mounting and safety clearances

Guidance on permissible mounting positions and safety clearances.

Locking devices

Describes various locking devices for securing circuit breakers.

Connecting

Cables and busbars

Information on connecting circuit breakers with cables and busbars.

Main connection types for fixed mounting

Main connection methods for plug-in and withdrawable version

Displays and operator controls

Overcurrent trip unit without LCD display

Explains setting options for trip units without an LCD display.

Overcurrent trip units with LCD display

Details features and operation of trip units with LCD displays.

Parameter assignment; addressing

Setting the parameters

Explains how to set parameters on the ETU and tripping characteristics.

Setting the protection parameters for motor protection (ETU10 M, ETU30 M and LCD-ETU 40 M)

Details parameter settings for motor protection with specific ETU types.

Service and maintenance

Preventive measures

Outlines necessary preventive measures and inspection intervals.

Troubleshooting

Provides guidance on identifying and resolving common circuit breaker issues.

Technical data

General data - 3 VL molded case circuit breakers

Lists key electrical and mechanical data for the circuit breaker series.

Technical overview

Provides an overview of operating data, dimensions, and switching capacities.

Configuration of main connections

Details on main connection types and conductor cross-sections.

Derating factors

Explains derating factors for high altitudes and diverse ambient temperatures.

Motor Protection

Details characteristic values for motor protection with different trip classes.

Motorized operating mechanisms

RCD modules

Technical data for RCD modules used for system protection.

Undervoltage release

Shunt release

Ground-fault detection

Circuit diagrams

The circuit diagram examples below show the most frequent uses of the 3 VL molded case circuit breaker

Control with undervoltage release

Circuit diagrams VL1... 6, motorized operating mechanism with stored energy mechanism, with or without undervoltage release

Circuit diagrams, undervoltage release and shunt release

Circuit diagrams 3 VL plus RCD module

Spare parts;accessories

Installation

Terminal covers;phase barriers

Siemens SENTRON 3VL400 Specifications

General IconGeneral
BrandSiemens
ModelSENTRON 3VL400
CategoryProtection Device
LanguageEnglish

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