Siemens SENTRON 3VL1250 User Manual

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

Siemens SENTRON 3VL1250 Specifications

General

Brand	Siemens
Model	SENTRON 3VL1250
Category	Protection Device
Language	English

Summary

Product-specific information

Important notes

Details validity, standards, certifications, and operating conditions for 3VL molded case circuit breakers.

Ordering data

Explains the order number scheme for locating and combining circuit breakers for specific applications.

Product description

Application overview

Provides an overview of the most frequently occurring applications for 3VL molded case circuit breakers.

Configuration

Functional principle

Describes the mechanical design, trip-free mechanism, and current limiting principles.

Thermal-magnetic overcurrent trip units

Explains the thermal and magnetic release components and their series connection.

Electronic overcurrent trip unit (ETU)

Details ETUs, their configuration using current transformers, and power supply requirements.

Mechanical operating mechanisms

Toggle lever operating mechanism

Description of the basic toggle lever actuator, its positions, and reset procedure.

Rotary mechanism on front (optional)

Describes the front-operated rotary mechanism converting vertical toggle movement to rotary motion.

Door-coupling rotary operating mechanism (optional)

Details the door-coupling mechanism for control cabinets and its design features.

Motorized operating mechanisms (optional)

Motorized operating mechanism (MO)

Describes the MO mechanism for remote switching, its integrated position indicator, and modes.

Functions

Protection functions

An overview of the protection functions offered by the 3VL molded case circuit breakers.

Overcurrent release

Explanation of the overcurrent release mechanism based on magnetic repulsion of contacts.

Setting options of the overcurrent release

Table detailing setting options for overcurrent releases, including overload and short-circuit protection.

Differential current protection with RCD module

Standard features

Details on RCD module features like mechanical trip display, reset button, LEDs, and test button.

Single-pole operation with RCD module

Ground-fault protection

Explanation of ground-fault protection and methods for detection in balanced and unbalanced systems.

Internal accessories

Undervoltage release

Technical data and functional description of the undervoltage release accessory.

Shunt release

Technical data and functional description of the shunt release accessory.

Auxiliary switches and alarm switches

Details on the use and function of auxiliary and alarm switches.

Application planning

Use with frequency converters

Using 3VL MCCBs as protection devices in systems with frequency converters and drives.

Transformer protection on the primary side

Using MCCBs for primary side protection of low-voltage AC transformers, considering inrush currents.

Use in DC systems

Use in IT systems

Selection criteria for molded case circuit breakers

Dimensioning and selection of MCCBs based on IT system requirements and maximum short-circuit current.

Fault situation

Analysis of critical fault situations in ungrounded IT systems, focusing on double ground faults.

Use in motor protection

Operating principle of the overcurrent releases

Explanation of tripping characteristic curves for inverse-time delayed overload releases for motors.

Trip class

Options for selecting trip classes (e.g., ETU 10 M, ETU 30 M) for different motor applications.

Use in unusual environments:

Reduction factors under unusual operating conditions

Use at different ambient temperatures

Use in series connection

Current selectivity

Calculating selectivity in overload and short-circuit ranges by comparing time/current characteristics.

Time selectivity

Zone-selective interlocking - ZSI

ZSI function for preventing undesired release times in series-connected MCCBs.

Use in transfer control system

Overview of the 3KC ATC5300 transfer control device

Installing/mounting

Installation methods

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

Fixed mounting

Plug-in version

Mounting and safety clearances

Safety clearances

Locking devices

Locking devices for a padlock

Devices for locking the toggle lever and front-operated rotary operating mechanism with padlocks.

Locking device with a safety lock

Information on using safety locks for rotary and motorized operating mechanisms.

Mutual interlocking of two molded case circuit breakers

Connecting

Cables and busbars

Methods for connecting MCCBs using cables, flexible copper bars, or busbars.

Main connection types for fixed mounting

Displays and operator controls

Overcurrent trip unit without LCD display

Overcurrent trip units with LCD display

Details on operating features of electronic trip units equipped with an LCD display.

Parameter assignment / addressing

Setting the parameters

Guidance on adjusting overcurrent release parameters based on system requirements.

Tripping characteristic curve and settings parameters

Understanding trip unit characteristics (L, S, I, N, G) and their parameters.

Setting the protection parameters for motor protection (ETU10M, ETU30M and LCD-ETU 40M)

Setting overload release (IR) and short-circuit release (Ii) for motor protection.

Service and maintenance

Preventive measures

Guidelines for qualified personnel regarding functionality tests and maintenance tasks.

Inspection

Checks for external housing, electrical/mechanical functions, connections, and settings.

Troubleshooting

Common fault causes and corrective actions for circuit breaker issues.

Technical data

Technical overview VL160X, VL160 to VL400

High breaking capacity VL160X, VL160 to VL400

Derating factors

Use at altitudes above 2000 meters

Use under diverse ambient temperatures

Derating factors for thermal-magnetic overcurrent releases at various ambient temperatures.

Plug-in or withdrawable version: Derating factors thermal-magnetic overcurrent releases

Thermal-magnetic overcurrent release + RCD module (Fixed mounting)

Capacitor banks

Selection of the molded case circuit breaker for protecting and switching capacitors

Motor Protection

Molded case circuit breakers for motor protection with fixed trip class ETU10M

Characteristic values for motor protection using ETU10M with fixed trip class.

Molded case circuit breakers for motor protection with adjustable trip class ETU30M

Characteristic values for motor protection using ETU30M with adjustable trip class.

Molded case circuit breakers for motor protection with adjustable trip class ETU40M

Characteristic values for motor protection using ETU40M with adjustable trip class and LCD.

Motorized operating mechanisms

Motorized operating mechanism with stored energy mechanism (SEO)

Technical data for SEO mechanisms across various VL series.

Motorized operating mechanism (MO)

Technical data

Technical data for MO mechanisms across various VL series.

RCD modules

Overview of RCD modules

Technical data for RCD modules used for system protection (3- and 4-pole).

Undervoltage release

Technical data of the undervoltage releases of the 3VL molded case circuit breakers

Technical data for undervoltage releases for VL160X, VL160 to VL400.

Time-delay device for undervoltage releases

Technical data

Shunt release

Technical data of the shunt releases of the 3VL molded case circuit breakers

Technical data for shunt releases for VL160X, VL160 to VL400.

Auxiliary switches and alarm switches

Technical data of the auxiliary and alarm switches of the 3VL molded case circuit breakers

Ground-fault detection

Overview of ground-fault protection classes

Summary of ground-fault detection methods based on release type.

IP degrees of protection

The degree of protection in accordance with IEC 60529 is listed in the table below:

Dimensional drawings

Withdrawable version and accessories

VL160 (3VL2) and VL250 (3VL3) molded case circuit breakers with front-operated rotary operating mechanism

VL630 (3VL5) molded case circuit breaker with rotary operating mechanism in withdrawable design

VL630 (3VL5) molded case circuit breaker with motorized operating mechanism with stored energy mechanism in withdrawable design

VL630 (3VL5) molded case circuit breaker with motorized operating mechanism in withdrawable design

VL400 (3VL4), 3- and 4-pole, up to 400 A

VL800 (3VL6), 3- and 4-pole, up to 800 A

Molded case circuit breaker with door-coupling rotary operating mechanism

Withdrawable version

Withdrawable version with front-operated rotary operating mechanism, insert position and remove position

Withdrawable version with motorized operating mechanism, insert position and remove position

Drawings for withdrawable versions with MO mechanisms for VL800

Withdrawable version with motorized operating mechanism with stored energy mechanism, insert position and remove position

Drawings for withdrawable versions with SEO mechanisms for VL800

VL1250 (3VL7) and VL1600 (3VL8), 3- and 4-pole, up to 1600 A

Operating mechanisms

Front-operated rotary operating mechanism

Withdrawable version motorized operating mechanism, insert position and remove position

Drawings for withdrawable versions with MO mechanisms for VL1250/VL1600

Interlocks for VL160X (3VL1) to VL800 (3VL6), 3- and 4-pole, up to 800 A

Locking with bowden wire

Circuit diagrams

Rotary mechanism / leading auxiliary switch

Circuit diagrams VL1 ... 8 motorized operating mechanism (MO)

Spare parts/accessories

Masking frames for door cutouts:

Terminal covers/phase barriers: