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To ensure accuracy, please note that images may be representative. Refer to the product data sheet for detailed specifications.
| Manufacturer | Symcom / Littelfuse |
| Manufacturer Product Number | 601 |
| Description | Voltage Monitor Relay; Lo/Hi V, Unbal, Loss, Rev; 190-480 VAC; TD 1-50s |
| Datasheet | Download Datasheet |
The Littelfuse SymCom 601 is a 3-phase voltage monitor for 190-480 V AC motors. It protects against low voltage, high voltage, voltage unbalance, single-phasing, phase reversal, low/high frequency and rapid cycling. Sensing: Fully programmable thresholds (3-digit display).
Trip / reset points: low voltage 170 V up to the high-voltage setting (programmable) / 103% of the low-voltage setting; high voltage Low-voltage setting up to 528 V (programmable) / 97% of the high-voltage setting; voltage unbalance 2-15% or off (programmable) / trip setting minus 1%.
Trip delay: 1-50 s (voltage, unbalance and frequency faults); 1-50 s (single-phase faults). Restart delay: Rapid-cycle timer 0 or 2-500 s; 2-500 s after all faults. Reset: Manual or automatic (programmable).
Mounting: Surface mount (4 x #8 screws) or DIN rail. Dimensions: 77.47 x 97.79 x 128.27 mm (3.05 x 3.85 x 5.05 in), H x W x D.
It operates from -20 to +70 °C. Approvals: UL 508, CSA C22.2 No. 14.
| Category | |
| Manufacturer | Symcom / Littelfuse |
| Monitoring Function | Low voltage, high voltage, voltage unbalance, single-phasing, phase reversal, low/high frequency, rapid cycling |
| Sensing Method | Fully programmable thresholds (3-digit display) |
| Input Voltage | 190-480 VAC |
| Low Voltage Trip / Reset | 170 V up to the high-voltage setting (programmable) / 103% of the low-voltage setting |
| High Voltage Trip / Reset | Low-voltage setting up to 528 V (programmable) / 97% of the high-voltage setting |
| Voltage Unbalance Trip / Reset | 2-15% or off (programmable) / trip setting minus 1% |
| Trip Delay | 1-50 s (voltage, unbalance and frequency faults); 1-50 s (single-phase faults) |
| Restart Delay (s) | Rapid-cycle timer 0 or 2-500 s; 2-500 s after all faults |
| Sensing Accuracy | Voltage ±1%; timing 5% ±1 s |
| Repeatability | Voltage ±0.5% |
| Reset Method | Manual or automatic (programmable) |
| Mounting Type | Surface mount (4 x #8 screws) or DIN rail |
| Dimensions | 77.47 x 97.79 x 128.27 mm (3.05 x 3.85 x 5.05 in), H x W x D |
| Operating Temperature (Storage) (°C) | -20...+70 |
| Approvals | UL 508, CSA C22.2 No. 14 |