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# 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.

||| Please note this product is not DIY! Installation must only be installed by a LICENSED ELECTRICIAN to local wiring regulations. Failure to follow these instructions can result in serious injury or death.

**Typical Wiring Schematic**

![](https://storage.crisp.chat/users/helpdesk/website/950a41c761a3a80/1_13rc7zd.png)

![](https://storage.crisp.chat/users/helpdesk/website/b3c547d8c88a1800/0ecf8923-1d5e-495c-94fe-79f77a_997amz.png)

**Recommended application**  
The R-C snubber suppressor should be applied as below, i.e. install across the coil of the contactor.
![](https://storage.crisp.chat/users/helpdesk/website/950a41c761a3a80/2_slxj97.png)

**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 |