======ATS Multi-Meters===
Suggested multi-meters for [[ats:relay|Auto Mains Fail Transfer Switch :: Relay Logic]]. 

  * Refer to product documentation for the correct wiring diagram. 

^ Manufacturer                                                    ^ Model     ^ Description                                                               ^ Cost  ^ Link                                                                           ^ Image                                       ^
| RS Pro                                                          |  1365377  | 3-digit, 3-line - V, A, kW, kVA, PF, kWH                                  |   $76 | [[https://us.rs-online.com/product/rs-pro/1365377/71768520/|RS Online]]        | {{:ats:rs-pro_136-5381.png?120&direct}}     |
| RS Pro                                                          |  1365382  | 4-digit, 3-line - V, A, kW, kVA, PF, kWH \\ Contact closure alarm output  |   $86 | [[https://us.rs-online.com/product/rs-pro/1365382/71768525/|RS Online]]        | :::                                         |
| TruMeter APM                                                    | APM-PWR   | 4 line + bar graph - V, A, kW, kVA, PF, kWH\\  Analog & digital outputs   |  $225 | [[https://us.rs-online.com/product/trumeter/apm-pwr-apo/72092157/|RS Online]]  | {{:ats:trumeter_apm_power.jpg?120&direct}}  |
| //**Three current transformers per meter are also required**//                                                                                                                                                                                                                            ||||||


====Current Transformer Examples:===
^ Manuf:                                                                                                                     ^ Model     ^ Parameters            ^ Link                                                       ^
| [[https://us.rs-online.com/transformers/current-transformers/?a10=Simpson&n16661=Current%20Transformer%20Series|Simpson]]  |  01305    | 400A:5A, 2" window    | https://us.rs-online.com/product/simpson/01305/70232978/   |
| RS Pro                                                                                                                     |  1718777  | 400A:5A, 30mm window  | https://us.rs-online.com/product/rs-pro/1718777/72303032/  |

\\ \\ 

<WRAP center round alert 70%>
**DANGER:** Current transformers must be connected to a device, or short-circuited before power is applied in the circuit to be measured. Current transformers are //constant current// devices, not //constant voltage// like ordinary transformers. 

  * **A C.T. with loose leads can have lethal voltage on the terminal, possibly over 1000V.** 

  * **Do not disconnect a C.T. when power is present in the measured circuit!** 
</WRAP>