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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 | 460-15 |
| Description | Voltage Monitor Relay; Lo/Hi V, Unbal, Loss, Rev; 190-480 VAC; TD 1-30s adj; 2NO |
| Datasheet | Download Datasheet |
The Littelfuse SymCom 460-15 is a 3-phase voltage monitor for 190-480 V AC motors. It protects against low voltage, high voltage, voltage unbalance, phase loss and phase reversal. It senses the line voltage automatically against a user-selectable nominal setpoint.
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: 1-30 s adjustable (low, high, unbalanced voltage); 1 s fixed for single-phase faults (>15% unbalance). Restart delay: 1-500 s adjustable (after a fault or a complete power loss). Reset: Automatic. Accuracy: ±1%. Diagnostics: LED diagnostics (cause of trip and relay status).
Output: 2 Form A (2 NO), 8 A @ 240 VAC general purpose. Mounting: 35 mm DIN rail or surface mount (#6 or #8 screws). Dimensions: 88.9 x 52.9 x 59.69 mm (3.5 x 2.08 x 2.35 in), H x W x D.
It operates from -20 to +70 °C and can be stored from -40 to +80 °C. Approvals: UL 508, CE.
| Category | |
| Manufacturer | Symcom / Littelfuse |
| Model | 460 |
| Monitoring Function | Low voltage, high voltage, voltage unbalance, phase loss, phase reversal |
| Sensing Method | Automatically senses line voltage; user-selectable nominal setpoint |
| Input Voltage | 190-480 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 | 1-30 s adjustable (low, high, unbalanced voltage); 1 s fixed for single-phase faults (>15% unbalance) |
| Restart Delay (s) | 1-500 s adjustable (after a fault or a complete power loss) |
| Setting Accuracy | ±1% |
| Reset Method | Automatic |
| Status Indicator | LED diagnostics (cause of trip and relay status) |
| Contact Configuration | 2 Form A (2 NO) |
| Output Rating | 8 A @ 240 VAC general purpose |
| Mounting Type | 35 mm DIN rail or surface mount (#6 or #8 screws) |
| Dimensions | 88.9 x 52.9 x 59.69 mm (3.5 x 2.08 x 2.35 in), H x W x D |
| Operating Temperature (Storage) | -20...+70 °C (-40...+80 °C) |
| Approvals | UL 508, CE |