50A Automatic Transfer Switch - 4-Pole 3-Position, RS485, Top In/Bottom Out is an automatic transfer switch designed for instant changeover between two AC power sources (mains and generator) in power distribution panels. It combines a 4-pole, 3-position mechanism with RS485 communications, fire-link input and generator start output.
🔧 Technical Highlights:
- Rated current: 50 A
- Poles: 4P (3-phase + neutral)
- Switching positions: Source I, Source II, OFF (3-position)
- Rated voltage: 400/415 V AC, 50 Hz
- Communication: RS485 (Modbus)
- Integration I/O: Fire-link input and generator start output
- Connection orientation: Top supply inputs / bottom load output
- Optional accessory: Remote LCD programmer/display (RD-LCD02)
✅ Benefits:
- Maintains continuity of supply by transferring loads to the healthy source automatically.
- OFF position supports safe isolation during commissioning and maintenance.
- Fire-link input and generator start output simplify integration into standby power systems.
- RS485 Modbus enables remote monitoring, logging and integration with BMS/SCADA.
- Optional remote LCD module provides convenient front-panel access to settings and status.
🚀 Applications:
- Mains-to-generator automatic changeover for commercial buildings and industrial sites.
- Critical loads: comms rooms, server cabinets, plant control panels and security systems.
- Pump stations, HVAC plant and process equipment requiring dual-source continuity.
- Fire-alarm interfaced standby power systems (fire-link input).
Built for dependable dual-source changeover with clear status, control integration and optional front-panel commissioning.
FAQs
- Q: Is this a 3-position ATS with an OFF position?
A: Yes. It provides Source I, Source II, and OFF positions for safe isolation and maintenance switching.
- Q: Does it support RS485 Modbus, fire-link input and generator start output?
A: Yes. The RDS5 controller supports RS485 Modbus communication and provides terminals for fire-link/external signalling and generator start integration.