GB/T 14048.5-2017Low-voltage switchgear and controlgear -- Part 5-1: Control circuit devices and switching element -- Electromechanical control circuit devices (English PDF)

Foreword

"Low-voltage switchgear and controlgear" consists of the following parts.

- Part 1.General rules;

- Part 2.Circuit-breakers;

- Part 3.Switches, disconnectors, switch-disconnectors and fuse-

combination units;

- Part 4-1.Contactors and motor-starters - Electromechanical contactors and

motor-starters (Including motor protector);

- Part 4-2.Contactors and motor starters - Semiconductor controllers and

starters for AC motors (including soft starters);

- Part 4-3.Contactors and motor-starters - AC semiconductor controllers and

contactors for non-motor loads;

- Part 5-1.Control circuit devices and switching element - Electromechanical

control circuit devices;

- Part 5-2.Control circuit appliances and switching elements - Proximity

switches;

- Part 5-3.Control circuit devices and switching elements - Requirements for

proximity devices with defined behaviour under fault conditions (PDDB);

- Part 5-4.Control circuit devices and switching elements - Method of

assessing the performance of low-energy contacts - Special tests;

- Part 5-5.Control circuit devices and switching elements - Electrical

emergency stop device with mechanical latching function;

- Part 5-6.Control circuit devices and switching elements - DC interface for

proximity sensors and switching amplifiers (NAMUR);

- Part 5-7.Control circuit devices and switching elements - Requirements for

proximity devices with analogue output;

- Part 5-8.Control circuit devices and switching elements - Three-position

enabling switches;

- Part 5-9.Control circuit devices and switching elements - Flow rate

switches;

- Part 6-1.Multiple function equipment - Transfer switching equipment;

- Section 6-2.Multiple function equipment control and protective switching

devices (or equipment) (CPS);

- Part 7-1.Ancillary equipment - Terminal blocks for copper conductors;

- Part 7-2.Ancillary equipment - Protective conductor terminal blocks for

copper conductors;

- Part 7-3.Ancillary equipment - Safety requirements for fuse terminal blocks;

- Part 8.Control units for built-in thermal protection (PTC) for rotating

electrical machines.

This Part is Part 5-1 of "Low-voltage switchgear and controlgear".

This Part is drafted in accordance with the rules given in GB/T 1.1-2009.

This Part replaces GB/T 14048.5-2008 "Low-voltage switchgear and

controlgear - Part 5-1.Control circuit devices and switching element -

Electromechanical control circuit devices".

As compared with GB/T 14048.5-2008, the main technical changes of this Part

are as follows.

- Delete the characteristic requirements related to the overvoltage of make-

break operation (see 4.9 of the 2008 edition);

- ADD polarity requirements for contact elements (see 4.10);

- ADD the information content which the manufacturer shall provide [see 5.1

o)~5.1 p)];

- Modify the marking requirements for terminals, emergency stop, etc. (see

5.2.1~5.2.4; 5.2.1~5.2.4 of the 2008 edition);

- ADD the requirements for glow-wire testing and test based on flammability

category (see 7.1.2.2, 7.1.2.3);

- Modify the requirements for clearances and creepage distances; and

directly QUOTE the corresponding provisions of IEC 60947-1 (see 7.1.4;

1 General

This Part of "Low-voltage switchgear and controlgear" applies to control circuit

devices and switching elements intended for controlling, signalling, interlocking,

etc., of switchgear and controlgear.

2 Terms and definitions

An assembly of one or more control switches fixed on the same panel or located

in the same enclosure.

A contactor relay with specified time-delay characteristics.

3 Classification

Control switches may be classified according to the contact element and the

Distinction is made according to how the time delay of a switching element is

achieved, e.g. electrical delay, magnetic delay, mechanical delay, or pneumatic

delay.

4 Characteristics

The normal use of a control switch is to close, maintain and open circuits in

accordance with the utilization category shown in Table 1.Also refer to Table 4.

Pilot switches having two or more contact elements which are not individually

adjustable may have different operating and return values for each contact

element.

5 Product information

Actuators may be identified by symbols in the form of engravings. If a stop-

button carries any symbol engraved or marked on the actuator, then this symbol

shall be a circle or an oval (signifying the value zero). The symbols circle or oval

shall be used for stop-buttons only.

6 Normal service, mounting and transport conditions

Clause 6 of IEC 60947-1.2007+A1.2010+A2.2014 applies with the following

additions.

The device, with or without the sealing gasket indicated by the manufacturer,

shall be capable of being mounted on any thickness of panel between 1 mm

and 6 mm, if necessary by the use of packing piece(s) supplied for the purpose.

7 Constructional and performance requirements

The actuator shall preferably latch in the actuated position with the control

contact open. This latching shall be released by a separate action, e.g. by

pulling, rotation, or by means of a key.

8 Tests

Routine tests are the responsibility of the manufacturer and are usually limited

to a mechanical inspection and a verification of the mechanical operation.

In certain cases, specified in Annex F, the inspection is supplemented by a

dielectric test.

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