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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 | 102A-3 |
| Description | Voltage Monitor Relay; Lo V, Unbal, Loss, Rev; 190-480 VAC; TD 2-30s adj |
| Datasheet | Download Datasheet |
The Littelfuse SymCom 102A3 is a 3-phase voltage monitor for 190-480 V AC motors. It protects against low voltage, voltage unbalance, phase loss and phase reversal. It auto-ranges between its 200 V and 400 V ranges against a user-selectable nominal setpoint.
Trip / reset points: low voltage 90% / 93% of setpoint; voltage unbalance 6% fixed / 4.5% (NEMA).
Trip delay: 2-30 s adjustable (unbalance and phasing faults remain 2 s). 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), 10 A @ 240 VAC general purpose. 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 | 102A |
| Monitoring Function | Low voltage, voltage unbalance, phase loss, phase reversal |
| Sensing Method | Auto-ranging dual range (200 V / 400 V); user-selectable nominal setpoint |
| Input Voltage | 190-480 VAC |
| Low Voltage Trip / Reset | 90% / 93% of setpoint |
| Voltage Unbalance Trip / Reset | 6% fixed / 4.5% (NEMA) |
| Trip Delay | 2-30 s adjustable (unbalance and phasing faults remain 2 s) |
| 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) |
| Output Rating | 10 A @ 240 VAC general purpose |
| 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 |