Using a contactor with a Powermesh switch
When wiring a Powermesh Multi Purpose switch ( PMMPSxxx) to a contactor, the use of an RC Suppressor module is highly recommended as a safeguard. The RC Suppressor will normalise current spikes and maintain a more stable voltage level that can be caused by these inductive loads which could potentially damage the switch.
Typical Wiring Schematic
Recommended application
The R-C snubber suppressor should be applied as below, i.e. install across the coil of the contactor.
Contactors Tested with Powermesh Switches
The table below lists 5 common contactors that have been tested with the Powermesh switch range. Using the NHP or ABB models listed below do not require the addition of the RC Suppressor.
Item No. | Brand | Part No. | Amp Rating / No. of Poles / Requres External RC Suprressor? |
|---|---|---|---|
1 | Hager | ESC125 | 25A / 1 / YES |
2 | Hager | ESC240 | 40A / 2 / YES |
3 | Clipsal | 4CNT4-40 | 40A / 4 / YES |
4 | NHP Terasaki | CTX4040230U | 40A / 4 / NO |
5 | ABB | ESB40-40 | 40A / 4 / NO |
Tested RC suppressors
The Table below lists 2 suitable RC suppressors that have been tested with the Powermesh switch range
Part Description | R-C Snubber Inductive Load Suppressor |
|---|---|
Brand | Okaya |
Manufacturer | Okaya Electric America Inc |
Part No. | XEB0471 |
R Value | 47 ohms |
C Value | 0.1uf |
Connection Type | flylead |
Unit Cost | ~$20 |
Part Description | R-C Mains Protector |
|---|---|
Brand | RS Components |
Manufacturer |
|
Part No. | RS240-393 |
R Value | 100 ohms |
C Value | 0.1uf |
Connection Type | DIN rail |
Unit Cost | ~$20 |
Updated on: 24/05/2023
Thank you!