Direct sales LW28-20/2 electric combination Univeral changeover swith dongheng speed switch circuit electrical

One, use

LW28 series switch is mainly used in AC 50Hz, rated voltage 440V and below, DC voltage 240V or below rated current up to 160A in electrical circuits, for manual infrequently on or off road, as control or transform

Purposes, can also be directly controlled three-phase asynchronous motors and use as master control and measurement circuits. Products are very versatile, can be used as a control switch, test equipment, motor control and master control switches, and welding machine with switch and so on.

Second, in line with the standard

GB14048.3, GB14048.5

Third, normal working conditions

(1) ambient air temperature does not exceed +400C, and its average temperature does not exceed +350C 24h;

(2) the lower limit of the ambient air temperature does not exceed -250C;

(3) the elevation of the installation location is not more than 2000m

(4) when the maximum temperature is +400C, relative humidity of air no more than 50% at lower temperatures can be allowed to have a higher relative humidity, such as a 90% 200C, frost on the occasionally due to climate change should take special measures.

IV installation conditions

(1) switch mounted on the pollution degree 3 environment condition;

(2) according to the factory instructions for installation.

Six: classification

1 by purpose

(1) the conversion of the main circuit switch;

(2) direct control over motor switch;

(3) the master switch for control and measurement.

2 Summary of operations

(1) location;

(2) complex type;

(3) from the complex.

3 press-contact system

(1) position-switch has a 1~ section 12 (switch only has 8 sections 63A and above);

(2) complex switches 1~ 3;

(3) direct control switch for motor 1~ main section 6.

4 according to the mode of operation combined with the operating position as shown in the following table

Note 1: the neutral grounding

2:AC-23A, AC-3, AC-4 rated power 3-phase 3-pole, AC-2 for 3-phase 3-pole.

Mechanical and electrical life

Mechanical life: 0.1x106, an operating frequency of 120 times per hour.

Electrical life: 0.03x106, an operating frequency of 120 times per hour.