Siemens Sentron 3VA User Manual

Description
2.4 Standards and guidelines
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
61
2.4.8
IP degrees of protection
The 3VA UL molded case circuit breakers meet the following IP protection classes as
defined by IEC 60529 and IEC 60947-1, Annex C:
Degree of protection IP30 is achieved when a 3VA UL molded case circuit breaker is
installed in a switchboard with a door cutout including cover frame (see below).
Handle and release are freely accessible, the panel door closes flush with the molded case
circuit breaker.
You can achieve a higher degree of protection up to IP65 in combination with the door-
mounted rotary operator.
The IP protection system according to IEC 60529 is used for devices and enclosures or
panels. However, there is not a comparable system for electrical devices themselves in the
UL world. According to NEMA 250, there is a "type-rated system" for electrical enclosures
and panels. In NFPA79 "Electrical Standard for Industrial Machinery", in which the
NEMA 250 ratings for electrical enclosures are provided in detail, requirements for electrical
equipment without enclosure can also be found in section 6 "Protection from Electrical
Hazards". In essence, it states that the protection from electric shock is to be tested using a
jointed test finger with a diameter of 12.5 mm. The test finger described in detail here
corresponds pretty closely to the test finger that must be used according to IEC 60529 for
testing the finger safety for IP2x degree of protection, except that the IEC finger must have a
diameter of 12.0 mm
Thus, devices that meet IP2x degree of protection generally meet the requirements of the
U.S. touch-safe standards.
You can find NEMA protection types of the manual operators in chapter NEMA degree of
protection (Page 291).

Siemens Sentron 3VA Specifications

General

Rated Current (In)	16 A to 1600 A
Type/Model	Sentron 3VA
Category	Circuit breakers
Rated Voltage (Ue)	Up to 690V AC
Poles	1, 2, 3, 4
Trip Unit Type	Thermal-magnetic, Electronic
Standards	IEC 60947-2
Protection Functions	Overload, Short-circuit, Ground fault
Mounting Type	Fixed, Plug-in

Summary

Legal Information

Warning notice system

Explains the system of safety notices and their grading by danger level.

Qualified Personnel

Defines qualified personnel for operating the product/system safely.

Proper use of Siemens products

Notes on using Siemens products correctly and safely.

Trademarks

Lists registered trademarks of Siemens AG and other trademarks.

Disclaimer of Liability

States the publisher's commitment to consistency and potential variances.

Introduction

About this documentation

Describes the manual's scope, focusing on 3VA UL molded case circuit breakers.

Product-specific information

Details the scope of validity and target audience for the manual.

Description

Overview - applications and portfolio

Provides an overview of 3VA molded case circuit breakers and their applications.

Ergonomic design

Highlights ergonomic design features of 3VA UL molded case circuit breakers.

Technical details

Covers technical details including breaker identification, operation, and current limitation.

Standards and guidelines

Outlines standards and guidelines met by 3VA UL molded case circuit breakers.

Protection functions

Explains the protection system of 3VA UL molded case circuit breakers.

Thermal-magnetic trip unit

Details the thermal-magnetic trip unit (TMTU) and its application cases.

Electronic trip unit

Describes the electronic trip unit (ETU) and its functions.

Applications

Use of the 3VA UL molded case circuit breakers in line protection

Details applications of 3VA UL molded case circuit breakers in line protection.

Use as Motor Circuit Protector (MCP) for starter combinations

Explains the use of 3VA UL molded case circuit breakers as motor circuit protectors.

Use of the 3VA UL molded case circuit breaker as a molded case switch (MCS)

Describes the application of 3VA UL molded case circuit breakers as molded case switches.

Use of 3VA UL molded case circuit breaker in DC systems

Covers the use of 3VA UL molded case circuit breakers in DC systems.

Use of 3VA UL molded case circuit breakers in IT systems according to IEC 60947-2

Details the use of 3VA UL molded case circuit breakers in IT systems per IEC 60947-2.

Accessories

Overview - Accessories for 3VA UL molded case circuit breakers

Provides an overview of the comprehensive range of accessories available.

Internal accessories

Details internal accessories like auxiliary switches, releases, and communication modules.

Connection system

Explains the connection technology for 3VA UL molded case circuit breakers.

Plug-in and draw-out technology

Covers plug-in and draw-out technology for quick replacement and service.

Manual operators

Describes various manual operators for circuit breaker control.

Motor operator

Details the MO320 motor operator for remote control of circuit breakers.

Locking and interlocking

Explains methods for locking, blocking, and interlocking circuit breakers.

Communication and system integration

Covers communication capabilities and system integration of 3VA UL breakers.

EFB300 external function box

Details the EFB300 external function box for expanding breaker functions.

MMB300 maintenance mode box

Explains the MMB300 maintenance mode box for improved protection during maintenance.

Test devices

Describes test devices (TD300, TD500) for local testing of electronic trip units.

External current transformer for N conductor

Details the external current transformer for neutral conductor protection.

Cover frame

Explains the function and types of cover frames for circuit breakers.

Service and maintenance

Notes

General notes on qualified personnel and maintenance categories.

Regular maintenance

Provides recommended maintenance and inspection intervals for circuit breakers.

Maintenance following tripping of a molded case circuit breaker

Outlines maintenance steps after a circuit breaker trip event.

Fault diagnostics

Offers guidance on diagnosing and rectifying common faults.

Technical specifications

Circuit diagrams

Presents circuit diagrams for basic units and accessories.

Dimensional drawings

Provides dimensional drawings for basic units and accessories.

Power losses

Details power losses for 3VA5 and 3VA6 molded case circuit breakers.

Derating

Explains derating factors for 3VA5, 3VA6, and MCS, considering ambient conditions.

Appendix

Standards and approvals

Lists international standards and approvals met by the circuit breakers.

ESD guidelines

Electrostatic sensitive devices (ESD)

Provides guidelines for handling electrostatic sensitive devices to prevent damage.

List of abbreviations

Table of abbreviations

Lists abbreviations and their meanings used throughout the document.

Conversion tables

Conversion tables

Offers conversion tables for units of length, weight, temperature, and torque.