About the LW8D Rotary Switch
The LW8D Rotary Switch is part of the ELEHPD Rotary Switch range. Application LW8D rotary switch applied to change over of circuits and control motors as well. Designation Use as control switches Tropical product code:TH Y represent:round installation Use as motor switch Re:Q for start and run; N for reversing; S for 2 speed. Technical parameters type LW8D-10 LW8D-20 Rated thermal current Ith A 10 20 Rated working voltage Ue V 240 250 380 240 250 380 Rated 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 LW8D rotary switch applied to change over of circuits and control motors as well.
Designation
Use as control switches
![]() Tropical product code:TH Y represent:round installation |
Use as motor switch
![]() Re:Q for start and run; N for reversing; S for 2 speed. |
Technical parameters
|
type |
LW8D-10 |
LW8D-20 |
Rated thermal current Ith |
A |
10 |
20 |
|
|
V |
240 |
250 |
380 |
240 |
250 |
380 |
|
|
|
|
|
|
|
|
|
|
AC-15 |
A |
1.60 |
|
0.95 |
4.60 |
|
2.60 |
|
AC-3 |
A |
|
|
5.00 |
|
|
12 |
|
DC-13 |
A |
|
0.14 |
|
|
0.27 |
|
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.
Dimensions and installation
Square escutcheon plate
Round escutcheon plate
| |
![]()
|
|
type |
L(mm) |
|
Square escutcheon plate |
Round escutcheon plate |
|
LW8D-10 |
22+10n |
13+10n |
|
LW8D-20 |
22+13n |
35+13n |
|
| Installation |
![]() |
square escutcheon plate round escutcheon plateFrequently asked questions about the LW8D 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.
Related Rotary Switch models
Further reading
