Contactor question

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D.Vesa

Joined May 3, 2015
6
Hello ,
A customer wants a 3-phase contactor for his future 3-phase motor pomp . His currently contactor broke but now he has a 1-phase motor pomp and in the near future he wants to change the 1-phase pomp with a 3-phase one.
He asked me if he buys a 3-phase contactor , can he connect the 1-phase pomp to the 3-phase contactor ?
 

#12

Joined Nov 30, 2010
18,224
yes. You can use one or two of the contactor channels without harming the motor or the contactor. When you need 3 phase control, just attach the third power wire to the contactor.
 
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MaxHeadRoom

Joined Jul 18, 2013
28,772
Do a search on ebay for Telemecanique, they are a nice product.
You may have to review the existing overloads to see if they are suitable for the 1ph motor.
The modern electronic O/L's have a range setting.
Max.
 

strantor

Joined Oct 3, 2010
6,815
I would like to know if the following contactors are the same in function? And can they be replaced?

1 - Schneider Electric LC1D18M7
2 - Siemens 3RT20181AP61
https://mall.industry.siemens.com/mall/en/us/Catalog/Product/3RT20181AP61

Power contactor,
AC-3
16 A,
7.5 kW
400 V
1 NO
220 V AC 50 Hz,
240 V 60Hz,
3-pole,
Size S00 screw terminals

https://www.superbreakers.com/schne...wHq1bCQeXbURUAVQWXKlB5oXuHjKinj8aAlr5EALw_wcB

No. Of Poles : 3-Pole
• Amperage : 18Amps
• Contact Rating : 600V
• Coil Voltage : 220Vac 50/60 Hz
• Enclosure : Open
• Connection: Screw Clamp
• Mounting : 35mm DIN Rail
• Power Rating : 1 Hp At 115 V 1 Phase 3 Hp At 230 V 1 Phase 5 Hp At 200/230 V 3 Phase 10 Hp At 460 V 3 Phase 15 Hp At 575 V 3 Phase
 

Reloadron

Joined Jan 15, 2015
7,546
Hello ,
A customer wants a 3-phase contactor for his future 3-phase motor pomp . His currently contactor broke but now he has a 1-phase motor pomp and in the near future he wants to change the 1-phase pomp with a 3-phase one.
He asked me if he buys a 3-phase contactor , can he connect the 1-phase pomp to the 3-phase contactor ?
Considering May 3rd 2015 I figure by now problem solved. Yes, you can use a 3 phase contactor for switching a single phase.



Ron
 
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