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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 | 350-600 |
| Description | Voltage Monitor Relay; Lo V, Unbal, Loss; 475-600 VAC; TD 4s/2s; SPDT; Surface Mount |
| Datasheet | Download Datasheet |
The Littelfuse SymCom 350-600 is a 3-phase voltage monitor for 475-600 V AC motors. It protects against low voltage, voltage unbalance and single-phasing.
Trip / reset points: low voltage 90% / 93% of setpoint; voltage unbalance 6% fixed / 4.5% (NEMA).
Trip delay: 4 s (low voltage); 2 s (unbalance and phasing faults). Restart delay: 2 s (after a fault or a complete power loss). Reset: Automatic. Accuracy: ±1%. Diagnostics: Single LED diagnostics (five light patterns).
Output: 1 Form C (SPDT). Mounting: Surface mount (#8 screws). Dimensions: 74.42 x 133.86 x 74.93 mm (2.93 x 5.27 x 2.95 in), H x W x D.
It operates from -40 to +70 °C and can be stored from -40 to +80 °C. Approvals: UL 508, CSA C22.2 No. 14.
| Category | |
| Manufacturer | Symcom / Littelfuse |
| Model | 350 |
| Monitoring Function | Low voltage, voltage unbalance, single-phasing |
| Input Voltage | 475-600 VAC |
| Low Voltage Trip / Reset | 90% / 93% of setpoint |
| Voltage Unbalance Trip / Reset | 6% fixed / 4.5% (NEMA) |
| Trip Delay | 4 s (low voltage); 2 s (unbalance and phasing faults) |
| Restart Delay (s) | 2 s (after a fault or a complete power loss) |
| Setting Accuracy | ±1% |
| Reset Method | Automatic |
| Status Indicator | Single LED diagnostics (five light patterns) |
| Contact Configuration | 1 Form C (SPDT) |
| Mounting Type | Surface mount (#8 screws) |
| Dimensions | 74.42 x 133.86 x 74.93 mm (2.93 x 5.27 x 2.95 in), H x W x D |
| Operating Temperature (Storage) | -40...+70 °C (-40...+80 °C) |
| Approvals | UL 508, CSA C22.2 No. 14 |