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
| Item | Specification |
|---|
| Input voltage | DC 110V (typical range per official manual) |
| Output voltage | DC 48V (rated) |
| Output current | 20A |
| Output power | ≈960W (48V × 20A) |
| Conversion efficiency | ≥91% (D20 series reference) |
| Voltage regulation accuracy | ≤±0.5%–0.6% |
| Ripple | ≤200mV |
| Acoustic noise | ≤50dB |
| Parallel current-sharing imbalance | ≤±3% |
| Communication interface | RS485 (Modbus-type protocol) |
| Protection functions | Input over/under-voltage, output over-voltage, over-current,
short-circuit, over-temperature |
| Cooling method | Fan cooling |
| Mounting | Embedded rack-mount installation, hot-swappable |
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).
