AVS303 / AVS3P-0 — three-phase voltage monitoring relays up to 1250 A
Country: United Kingdom · Model: AVS303 / AVS3P-0
AVS303 three-phase voltage relays with a built-in contactor switch from 23 to 1250 A per phase, while the AVS3P-0 controls an external contactor. They are installed in front of pumps, motors, refrigeration plants and other industrial equipment.
- Current
- AVS303: 23–1250 A per phase (built-in contactor); AVS3P-0 — external contactor control
- Protection
- overvoltage and undervoltage on any phase, phase loss; optional frequency, phase sequence and phase imbalance
- Delay
- 10 s – 10 min
Technical specifications
| Current | AVS303: 23–1250 A per phase (built-in contactor); AVS3P-0 — external contactor control |
|---|---|
| Protection | overvoltage and undervoltage on any phase, phase loss; optional frequency, phase sequence and phase imbalance |
| Delay | 10 s – 10 min |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The relay switches the load off when the voltage on any phase goes above or below the setpoint, and also on phase loss, which makes induction motors overheat within minutes. Optional monitoring of frequency, phase sequence and phase imbalance is available, which matters for pumps, because wrong phase sequence reverses the direction of rotation. Restart takes place after a delay of 10 s to 10 min, so that after a mains outage the motors do not start at the same time. The AVS303 is supplied in a metal cabinet with the contactor inside. The AVS3P-0 has a compact plastic enclosure and controls only the coil of the customer's contactor, so it is used to protect lines with a starter already installed.
How to choose
The AVS303 is ordered for the load current within 23–1250 A per phase, and it is installed as a separate cabinet without additional devices. The AVS3P-0 is more cost-effective if the panel already has a contactor or motor starter. For single-phase consumers up to 100 A there are the AVS13 – AVS100, and the plug-in iS / iSense Guards cover individual appliances at 6–10 A.
Request a price and lead time
AVS303 / AVS3P-0 — three-phase voltage monitoring relays up to 1250 A. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What current does the AVS303 three-phase relay switch?
The AVS303 is made for 23–1250 A per phase with a built-in contactor, and the rating is selected by the current of the protected line.
How does the AVS3P-0 differ from the AVS303?
The AVS3P-0 has no power contactor and controls an external one, so it is installed in panels where a contactor already exists. The AVS303 is supplied with a 23–1250 A contactor.
What does the AVS303 three-phase voltage relay protect against?
Against overvoltage and undervoltage on any phase and against phase loss. Monitoring of frequency, phase sequence and phase imbalance can be added as an option.
What is the restart delay of the AVS303 and AVS3P-0?
The delay is adjustable from 10 s to 10 min. A long delay is set for refrigeration plants, a shorter one for pumps.
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