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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 | 455480R |
| Description | Voltage Monitor Relay; 380-480 VAC; TD 2-30s adj; 1 Form C (SPDT); Surface Mount |
| Datasheet | Download Datasheet |
The Littelfuse SymCom 455480R is a 3-phase voltage monitor for 380-480 V AC motors. It protects against low voltage, high voltage, voltage unbalance and single-phasing; load-side monitoring for contactor failure. Sensing: Line and load side monitoring.
Trip / reset points: low voltage 90% / 93% of setpoint (±1%); high voltage 110% / 107% of setpoint (±1%); voltage unbalance 2-8% adjustable / trip setting minus 1% (5-8%), minus 0.5% (2-4%) (NEMA).
Trip delay: 2-30 s adjustable (low/high voltage and unbalance); 2 s fixed (single-phasing, >25% unbalance). Restart delay: Manual or 2-300 s adjustable (after a fault, a complete power loss or a motor shutdown). Reset: Manual or automatic.
Output: 1 Form C (SPDT). Mounting: Surface mount (#8 screws). Dimensions: 74.4 x 133.9 x 74.9 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, CE.
| Category | |
| Manufacturer | Symcom / Littelfuse |
| Model | 455 |
| Monitoring Function | Low voltage, high voltage, voltage unbalance, single-phasing; load-side monitoring for contactor failure |
| Sensing Method | Line and load side monitoring |
| Input Voltage | 380-480 VAC |
| Low Voltage Trip / Reset | 90% / 93% of setpoint (±1%) |
| High Voltage Trip / Reset | 110% / 107% of setpoint (±1%) |
| Voltage Unbalance Trip / Reset | 2-8% adjustable / trip setting minus 1% (5-8%), minus 0.5% (2-4%) (NEMA) |
| Trip Delay | 2-30 s adjustable (low/high voltage and unbalance); 2 s fixed (single-phasing, >25% unbalance) |
| Restart Delay (s) | Manual or 2-300 s adjustable (after a fault, a complete power loss or a motor shutdown) |
| Repeatability | ±0.1% (fixed conditions) |
| Reset Method | Manual or automatic |
| Contact Configuration | 1 Form C (SPDT) |
| Mounting Type | Surface mount (#8 screws) |
| Dimensions | 74.4 x 133.9 x 74.9 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, CE |