Product Introduction
The TH48D20ZZ-220 is a high-frequency switching rectifier module from the TH series intelligent communication power supply family, delivering a nominal 48V DC output at 20A for telecom and DC power applications. It is built on world-leading resonant voltage-type double-loop control conversion technology, offering high efficiency, compact size, light weight and high reliability.

The module accepts both AC 220V (±15%) and DC 220V (-10%~30%) inputs, making it a true dual-input power supply for sites powered by grid or DC bus. An onboard standard RS-485 communication interface allows seamless connection to automatic monitoring systems (four-remote: remote measurement, remote signaling, remote control, remote adjustment). With natural cooling, hot-swappable design and three working modes (automatic, manual, independent), it is the ideal plug-and-play power module for program-controlled switchboards and various communication equipment.

Product Parameters

Product Advantages

1. High conversion efficiency (≥91%) — lower power loss and reduced electricity cost over the system lifetime.
2. Dual AC/DC input flexibility — operates from AC 220V grid or DC 220V bus, ideal for hybrid-powered sites.
3. Wide output adjustment (40~58V) — supports float and boost charging set points for different battery configurations.
4. Natural cooling, zero moving parts — silent operation, no fan failure, minimal maintenance and longer service life.
5. Smart RS-485 monitoring (MODBUS/TH protocol) — full four-remote integration with SCADA / site monitoring systems.
6. Parallel operation with ≤±3% current sharing — supports N+1 redundant configurations for 24/7 critical loads.
7. Hot-swappable design — modules can be replaced without shutting down the system, maximizing uptime.
8. Compact and lightweight (4.5 kg) — easy 19-inch rack installation and simple field replacement.
9. Comprehensive protection — input under/over-voltage, output over-voltage, over-current and over-temperature protection.
10. CE & ISO certified — meets international safety and quality standards, suitable for export projects.

Usage Scenarios

- Telecom base stations & exchanges — powering program-controlled switches and BTS/NodeB equipment.
- DC power systems (DC panel) for substations, power plants and distribution rooms.
- Battery charging systems — float and boost charging for lead-acid battery banks.
- Communication equipment rooms & IDC data centers — reliable 48V DC bus power.
- Railway, oil & gas, and industrial automation sites requiring rugged 48V DC power.
- Backup power and site power retrofit projects where existing 220V DC plants need module-level upgrade.

FAQ
Q1: What is the output voltage and current of TH48D20ZZ-220?
The module delivers a nominal 48V DC output, adjustable from 40V to 58V to match different battery float/boost requirements, with a maximum output current of 20A.

Q2: Can the module work with both AC and DC input?
Yes. It accepts AC 220V ±15% as well as DC 220V (-10%~30%), so the same module can be used in grid-powered or DC-bus-powered sites without modification.

Q3: Can multiple modules be connected in parallel for higher capacity or redundancy?
Yes. Multiple TH48D20ZZ-220 modules can operate in parallel with automatic current sharing (imbalance ≤±3%), enabling N+1 redundant configurations for high-reliability telecom and industrial systems.

Q4: Does the module support remote monitoring and control?
Yes. It is equipped with a standard RS-485 interface supporting MODBUS and TH protocols, providing four-remote functions (remote measurement, signaling, control and adjustment). It also offers three working modes: automatic, manual and independent.

Q5: What about cooling, operating environment and certifications?
The module uses natural cooling, so it runs silently with no moving parts to maintain. Operating temperature range is -10℃ to +40℃, and the hot-swappable design allows live replacement. It is certified to CE, ISO 9001 and ISO 14001, with a 1-year warranty.

Shijiazhuang Tonhe Electronic Technology Co., Ltd. is a high-tech enterprise dedicated to technological innovation, product innovation, and management innovation in the power electronics industry. The company integrates R&D, manufacturing, sales, and service in the power electronics sector, providing customers with comprehensive energy solutions. Founded in 1998, the company was wholly transformed into a joint-stock company in 2012 and successfully listed on the ChiNext Board of the Shenzhen Stock Exchange on December 31, 2015, with stock code 300491. As a highly promising knowledge-intensive high-tech enterprise, the company has maintained steady and sustainable growth. It currently employs over 1,600 people, with R&D personnel accounting for approximately 30% of the workforce. To date, the company has obtained more than 200 patents and over 60 software copyrights.