ATS Multi-Meters
Suggested multi-meters for 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 | RS Online |  |
| RS Pro | 1365382 | 4-digit, 3-line - V, A, kW, kVA, PF, kWH Contact closure alarm output | $86 | RS Online | |
| TruMeter APM | APM-PWR | 4 line + bar graph - V, A, kW, kVA, PF, kWH Analog & digital outputs | $225 | RS Online |  |
| Three current transformers per meter are also required | |||||
Current Transformer Examples:
| Manuf: | Model | Parameters | Link |
|---|---|---|---|
| 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/ |
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!