LW12D Rotary Switch

About the LW12D Rotary Switch

The LW12D Rotary Switch is part of the ELEHPD Rotary Switch range. Application LW12 rotary switch applied to change over of circuits and control motors as well. Designation Use as control switches Tropical procduct code:TH or TA. Use as motor switch Re:Q1、Q2 for start and run; N for reversing; S for 2 speed; SN for 2 speed and revesing. Technical parameters Rated thermal current Ith A 16 Rated working voltage Ue V 240 250 380 Rated working current Ie AC ELEHPD manufactures and exports low voltage electrical products from Yueqing, Zhejiang, China, supplying distributors, panel builders, M&E contractors and OEM buyers worldwide.

Typical applications

Motor control centres and pump or fan starters
Machine building, conveyors, packaging and CNC equipment
HVAC control panels and building automation
Water treatment, irrigation and pumping stations
Panel retrofits replacing electromechanical control gear

How to specify the right Rotary Switch

Size the contact rating for the inductive load, not just the resistive current (AC-3 duty for motors)
Check the coil voltage and frequency available in the panel: 24 V DC, 110 V, 230 V or 400 V AC
Confirm the auxiliary contact count needed for the control and indication circuit
Match the enclosure rating to the environment (IP20 inside a panel, IP65 on the machine)

Specifications

Application
　　LW12 rotary switch applied to change over of circuits and control motors as well.

Designation
Use as control switches

　Tropical procduct code:TH or TA.

Use as motor switch

　Re:Q1、Q2 for start and run; N for reversing; S for 2 speed; SN for 2 speed and revesing.

Technical parameters

　Rated thermal current Ith

A

16

　Rated working voltage Ue

V

240

250

380

　Rated working current Ie

AC-15

A

4.60

2.60

AC-13

A

0.27

AC-3

A

12

AC-4

A

0.55

12

Mechanical life
　　Mechanical life without load:0.3×10⁶times,operation frequency is 120 times/h.
　　Mechanical life with load:0.1×10⁶times under AC-15,0.1×10⁶times under DC-13,,operation frequency is 300 times/h,0.1×10⁶times under AC-3,0.1×10⁶times under AC-4,operation frequency is 120 times/h.

Dimensions and installation
Dimensions

Limited movement: L=30+13.2n （n for number of layers）
Sping return、Limited movement with spring return: L=42+13.2n （n for number of layers）
45^o spring return type: L=58+13.2n （n for number of layers）

Installation

Installation for limiting and spring return　　Installation for key lock Installation for switch with indicating lamps

Frequently asked questions about the LW12D Rotary Switch

What is the difference between a contactor and a relay?

A contactor is built for switching power circuits repeatedly at high current, often with motor duty ratings (AC-3) and arc-suppressing chambers. A relay switches control signals at low current. In practice: contactor for the motor, relay in the control circuit that drives the contactor coil.

How do I calculate the correct contactor size for a motor?

Use the motor's full-load current, apply the AC-3 rating for the operating voltage, and allow for the number of starts per hour. As a rule of thumb, the contactor's AC-3 rating should be at least equal to the motor FLC, then step up one frame if the duty is heavy.

Do you supply the coil voltage I need?

Coil voltages are specified per order. Send the model number, coil voltage and frequency you require and we will confirm availability and lead time.

Are auxiliary contacts included?

Base models come with the standard auxiliary contact configuration for that frame. Add-on auxiliary blocks and mechanical interlocks can be quoted with the contactor.