Weg EC-R2 Reversing Bus Bar Kit for CWB40-CWB80 Contactors for CWB Contactors

Weg reversing bus bars for CWB contactors provide an easy means of building a reversing contactor for 3-phase electric motors.

Compatible Contactors for the EC-R2 Bus bar

CWB40, CWB50, CWBN2, CWB65, CWB80,

How to Build a Reversing Contactor

Items Needed

• 2 Weg CWB contactors, appropriately sized for the motor current.
• 1 Weg IM1 or IM2 interlock, depending on contactor size
• 1 set of Weg Reversing Bus bars, EC-R1,EC-R2, or EC-R3
• (optional-strongly advised) Motor Overload Protection Relay, such as the Weg RW27 or RWB series

Steps (see assembly photo):

1. Mount the two CWB contactors side-by-side with the mechanical interlock sandwiched in-between.
2. Attach the bus bar with the two small tabs on the top of the two contactors
3. Attach the bus bar without any tabs to the bottom of the two contactors
4. Connect the two coils up to the appropriate switches or other controls
5. Connect incoming power, appropriately fused, to the top of the left contactor
6. Connect the motor leads to the bottom of the left contactor
7. Optional: Connect overload relay to bottom of left contactor, then connect motor leads to bottom of overload relay. Wire overload relay contacts appropriately with control to the contactor coils (beyond scope of this guide).

Documentation

• Weg CWB Flyer
• Weg CWB & RW27 Catalog