Description
NSR750U – 750W DC UPS / Battery Charger (12, 24, or 48Vdc)
The Helios NSR750U is a high-efficiency 750W DC UPS and battery charger available in 12Vdc, 24Vdc, or 48Vdc models. Designed for mission-critical fixed installations that require uninterrupted DC power and intelligent battery management, the NSR750U ensures seamless no-break power transfer between mains and battery. This makes it an ideal choice for SCADA networks, telecommunications infrastructure, industrial control systems, security and surveillance equipment, and utility substations.
This next-generation industrial DC UPS builds on Helios’ proven SR-series reliability with advanced monitoring, protection, and flexible configuration. Key functions include programmable temperature-compensated charging, deep discharge protection, low-voltage disconnect (LVD), and electronic circuit breaker (ECB) protection—ensuring extended battery service life and maximum uptime for critical systems.
The NSR750U is compatible with a wide range of battery chemistries, including sealed lead-acid (SLA), AGM, Gel, and Lithium-ion, providing flexibility for both legacy systems and modern energy storage solutions.
Built for harsh environments, the NSR750U incorporates rugged construction, dual-fan cooling, and an IP20-rated chassis. The unit operates efficiently in ambient temperatures from –10°C to +50°C and supports a wide input range (90–264Vac), delivering up to 90% conversion efficiency for reduced heat and lower operating costs.
For monitoring and control, all NSR750U models include RS-485 MODBUS RTU. Optional Ethernet/SNMP versions add web-based configuration, data logging, and remote diagnostics. Local LEDs and programmable alarm relays provide additional system health information, while network protocols support seamless integration with SCADA, PLC, and remote telemetry systems.
M8 terminals are available on all models, with Phoenix connectors also available on 24Vdc and 48Vdc models. Combined with optional Ethernet/SNMP capability, the NSR750U can be adapted to a wide range of DC backup applications. Its advanced feature set makes it one of the most dependable DC UPS solutions for industrial and infrastructure environments.
The NSR Series is engineered and built in Australia, delivering trusted performance for critical DC power systems worldwide.
Features and Benefits
- Wide input range (90–264Vac) supports global deployment
- No-break transfer between mains and battery ensures continuity
- Up to 90% power efficiency reduces heat, losses and operating cost
- Programmable temperature-compensated charging for extended battery life
- Deep discharge protection, battery circuit integrity tests, and low-voltage disconnect (LVD)
- Compatible with SLA, AGM, Gel, and Lithium-ion batteries
- M8 terminals on all models; Phoenix connectors also available on 24Vdc / 48Vdc models
- Standard RS-485 MODBUS RTU interface; optional Ethernet/SNMP card with web interface
- LED indicators, alarm relays and fault signalling for system integration
Key Applications
- SCADA, automation and process control
- Telecommunications and network power backup
- Railway signalling and fixed transport infrastructure
- Security, surveillance and remote critical equipment
- Utility and substation DC infrastructure support
Safety Features
- Input fuse protection, varistor, and surge suppression
- Battery circuit protection via electronic circuit breaker (ECB)
- Overcurrent protection, short circuit limiting and overvoltage protection
- Ingress / chassis protection: IP20 rated enclosure
- Isolation ratings (I/P–O/P, I/P–FG, O/P–FG) consistent with industrial safety standards
