48D20NZ-110-K1301 Telecom Power Module Rectifier Module

Product Introduction
TH48D20NZ-110-K1301 is a communication power module (commonly referred to in the industry as a "communication module / telecom power module") used in DC power supply systems. It is designed and manufactured by Shijiazhuang Tonhe Electronics Technologies Co., Ltd.
- Core function: efficiently converts DC 110V system power to DC 48V / 20A to provide stable DC power for telecom equipment such as base stations, transmission and switching systems.
- Product positioning: although often loosely referred to as a "rectifier module," it is essentially a DC/DC converter (not an AC/DC rectifier). It does not connect directly to the AC mains. Instead, it connects to an existing 110V DC system (e.g., substations, railways, industrial DC panels) and steps the 110V bus voltage down to the 48V required by telecom equipment, eliminating the need to build a separate 48V rectifier system.
- Compatible systems: on Tonhe's official website, this module is listed as an optional "communication module" in the THJK006G-3N(F) DC power supply system, working alongside charging modules such as the TH220D03NZ-220AC and TH110D05NZ-220AC.
- Model number breakdown: `48` = 48V output; `D20` = 20A output; `NZ` = Fan cooling; `110` = DC 110V input; `K1301` = variant/customization code.

Product Specifications

Product Advantages
1. Voltage-level bridging: enables an existing 110V DC system (including battery backup) to power 48V telecom equipment directly, avoiding the cost and footprint of a second 48V rectifier system.
2. High efficiency, low loss: D20 series efficiency ≥91%, saving energy and reducing heat in long-term operation.
3. High power quality: voltage regulation accuracy ≤±0.6% and ripple ≤200mV meet the stringent supply requirements of telecom equipment.
4. Comprehensive protection and high reliability: input over/under-voltage, output over-voltage, over-current, short-circuit and over-temperature protection, suitable for harsh industrial environments.
5. Intelligent monitoring: RS485 communication connects to the system monitoring unit, enabling remote monitoring, alarms and parameter configuration to reduce O&M costs.
6. Modular parallel expansion: supports parallel operation with current sharing (imbalance ≤±3%), allowing capacity to scale flexibly with the load.
7. Easy maintenance: hot-swappable design allows faulty modules to be replaced without powering down the system.
8. Strong vendor backing: Tonhe is a listed company whose products serve State Grid, China Southern Power Grid, power plants, railways, and the steel and petrochemical industries, ensuring reliable after-sales support and spare parts availability.

Application Scenarios
1. Substations / power plants: supplying 48V power for on-site telecom and automation equipment within 110V DC power systems.
2. Railways and rail transit: using the 110V DC supply of traction/signaling systems to power telecom equipment along the line.
3. Industrial DC panel systems: powering telecom loads during DC panel retrofits or capacity expansion in industries such as steel, metallurgy and petrochemicals.
4. Telecom rooms / base stations: acting as a 48V power bridge where a 110V DC supply already exists (e.g., legacy exchanges or special sites).
5. Complete DC power system packages: supplied as an optional communication module within THJK-series DC power systems.

The diagram below (schematic) shows where this module sits in a typical system:

FAQ
Q1: Is the 48D20NZ-110 a rectifier? Is the input AC or DC?
It is a DC/DC converter module in the telecom power supply field (commonly categorized as a "telecom power module"). The input is DC 110V, and the output is DC 48V / 20A. It cannot be connected directly to the AC mains — it must be used within a 110V DC system.

Q2: What is the difference between this module and a TH48D20ZZ-220 type module?
The TH48D20ZZ-220 is a rectifier/charging module with AC 220V input (converting AC mains to DC), while the 48D20NZ-110 is a communication conversion module with DC 110V input (converting 110V DC to 48V DC). They perform different roles in the system and are not directly interchangeable.

Q3: Can modules be paralleled for expansion? How do they connect to the monitoring system?
Yes, multiple modules support parallel operation with current sharing (series reference: imbalance ≤±3%), allowing capacity to be configured flexibly. The modules feature an RS485 communication interface and can be connected to the system monitoring unit (e.g., Tonhe THJK series) for remote monitoring and parameter configuration.

Q4: What systems is it suitable for?
Typically for sites with an existing 110V DC bus (with battery backup), such as substations, power plants, railways/rail transit, and industrial DC panels, to supply 48V power to on-site telecom and automation equipment. It is also offered as an optional communication module in DC power systems such as the THJK006G-3N(F).