SST-DY7021 and SST-DY7021A Voltage/Current Signal Sensors adopt M-BUS two-wire bus power supply with non-polar connection; LCD displays real-time operating status; capable of detecting faults such as undervoltage, overvoltage, phase error and phase loss.
Product Performance Features:
※ Powered and communicated via M-BUS two-wire bus with non-polar connection;
※ LCD displays real-time operating status; capable of detecting undervoltage, overvoltage, phase misalignment, phase loss and other faults;
※ Detection error: ≤3%;
※ Multi-level password protection. Different passwords correspond to different operation levels for high security;
※ Address and alarm threshold can be arbitrarily set via keys;
※ Complies with National Standard GB28184-2011.
Model Selection:
| Model / Function | Specification | Measured Parameters | Detection Types |
| SST-DY7021 | 2-channel three-phase voltage + 1-channel three-phase current | Overvoltage, phase loss, phase misalignment, undervoltage, overcurrent | |
| SST-DY7021 | A | 2-channel three-phase voltage | Overvoltage, phase loss, phase misalignment, undervoltage |
| Product Dimension（H*W*L） | 82mm*100mm*66mm |
| Mounting Method | DIN Rail Mounting |
| Operating Voltage | DC18V-DC36V (Two-wire Bus Powered) |
| Display Mode | LCD/No Display |
| Measuring Voltage | 0-450V |
| Measuring Current | 0.1~5A (Default) |
| Communication Protocol | M-BUS |
| Communication Distance | ≤1000m |
| Operating Temperature | -20°C~55°C |
| Alarm Threshold | Less than 85% or greater than 115% of rated voltage (default), adjustable |
