UL489 DC Miniature Circuit Breaker

HIITIO UL-Certified DC Miniature Circuit Breaker

Reliable DC Protection up to 1000V for Solar, ESS, Telecom & EV Charging

DC up to 1000V (1P/2P/3P/4P)
Current Ratings: 16A–80A
UL489, IEC/EN 60947-2, TUV, RoHS/REACH certified
Thermal-magnetic tripping (B/C curves)
10kA ultimate breaking capacity
MX+OF remote trip & auxiliary signal options

Product Details

Detailed configurations and specifications for every pole option and smart-control combination.

Standard Pole Options & Specifications

Pole Configurations with MX+OF Intelligence

Rear-Side View – 4P with Smart MX+OF

Complete Feature Breakdown

From solar PV and energy storage to telecom power and EV fast-charging, this breaker delivers unmatched stability, protection, and certification compliance.

Unlike traditional miniature breakers, the HCB2D-80 is truly designed for DC.
Depending on the pole configuration, it supports:

1P: 250VDC
2P: 500VDC
3P: 750VDC
4P: 1000VDC

This wide voltage adaptability makes it suitable for:

High-voltage photovoltaic (PV) strings
Battery energy storage systems (BESS)
Industrial DC busbars
Telecom DC distribution
EV charging modules

Thermal Protection (Overload):

Monitors heating in the circuit caused by long-term overcurrent.
Ensures cables, connectors, and electronics don’t overheat.

Magnetic Protection (Short-Circuit):

Activates within milliseconds under extreme fault currents.
Stops dangerous fault current propagation.

Available Tripping Curves:

B Curve (4In ±20%) — Best for PV, UPS, resistive loads
C Curve (8In ±20%) — Best for ESS, DC power distribution, EV modules

Mechanical Life: 10,000 switching cycles
Electrical Life: 1,500 load cycles

This durability ensures:

Lower maintenance cost
Better system uptime
Longer lifespan compared to ordinary DC breakers

Modern solar, ESS, and telecom systems often work in:

High temperatures
Offshore humidity
Vibration-prone industrial areas
Dusty outdoor environments

The HCB2D-80 withstands all of them.

Environmental Ratings

Operating Temperature: –5°C to +40°C
Storage: –30°C to +70°C
Relative Humidity: 95%
Vibration Resistance: IEC 60068-2-6
Shock Resistance: IEC 60068-2-27
Pollution Degree: 3
Altitude: ≤2000m（with derating)

MX — Shunt Trip

Allows:

remote emergency shutdown
BMS-controlled protection
fire alarm linkage (FACP)
SCADA remote operation

OF — Auxiliary Contact

Provides:

ON/OFF status signal
panel monitoring
external alarms

Available Control Voltages

DC 12–24V
DC 24–48V
DC 48–60V

What Makes HIITIO UL DC MCB Different?

The rapid growth of solar PV, battery energy storage, 5G telecom, and EV charging systems is pushing DC voltages higher than ever. Conventional AC breakers are not designed for these conditions.

True High-Voltage DC Protection up to 1000VDC

Unlike conventional breakers adapted from AC designs, the HCB2D-80 is engineered from the ground up for DC behavior, supporting 250–1000VDC across 1P–4P configurations.

UL489 Certified for Global Project Compliance

Meets one of the world’s most demanding protection standards, making it suitable for North America, Europe, and large-scale engineering projects with strict certification requirements.

High Breaking Capacity — 10kA DC Performance

Handles severe DC fault currents with reliable interruption and controlled arc suppression, ensuring system stability during worst-case fault events.

Low Internal Resistance for High-Efficiency Systems

Minimizes energy loss and heat buildup, especially beneficial for battery racks, telecom DC power, and high-cycle ESS applications.

Smart MX+OF Ready for Remote Monitoring & Control

Supports shunt trip and auxiliary status outputs, enabling SCADA/BMS integration, safety interlocks, and remote emergency shutdown.

Built for Harsh Environments and Industrial Reliability

Withstand temperature swings, high humidity, vibration, and shock—ideal for outdoor PV arrays, ESS containers, and industrial DC cabinets.

Technical Specifications

Electrical Characteristics

Parameter	Value
Rated Operational Voltage	Up to 1000VDC (4P)
Rated Current	16A – 80A
Frame Current	80A
Breaking Capacity (Icu)	10kA
Service Breaking Capacity (Ics)	6kA
Tripping Type	Thermal-magnetic
Tripping Curve	B/C
Insulation Voltage	1000V
Impulse Withstand	6kV

Mechanical & Environmental

Parameter	Value
Mechanical Life	10,000 cycles
Electrical Life	1,500 cycles
Protection Degree	IP20
Installation	DIN35 Rail
Ambient Temperature	–5°C to +40°C
Storage Temperature	–30°C to +70°C
Humidity	95%
Altitude	≤2000m（higher requires derating）

Application Scenarios

Solar PV Systems

Energy Storage Systems (BESS)

EV Charging Stations

Telecom & Data Center Power Systems

Industrial DC Distribution

DC Microgrids &
Distributed Energy Systems

Comparison: HIITIO UL DC MCB vs. Conventional MCB

Feature	HIITIO HCB2D-80	Ordinary MCB
UL489 Certification	✓ Yes	χ No
Maximum DC Voltage	1000VDC	60–250VDC
Breaking Capacity	10kA	1–3kA
Thermal-Magnetic Curve	B/C optimized for DC	Often inaccurate for DC
Internal Resistance	Ultra-low	Higher
Accessories	MX+OF smart control	Limited
Mechanical Life	High	Medium
Suitable for ESS & PV	✓ Yes	χ Not reliable

Why Engineers Trust HIITIO

Engineered for reliability, certified for global markets, and trusted across solar, storage, EV charging, and industrial DC systems.

Advanced Manufacturing

Automated assembly lines
Strict quality checkpoints
Aging and load testing for every batch

Strong R&D Competence

Professional DC protection team
PV/ESS/EV-oriented development
Custom curve development capabilities

Certified for Global Markets

UL, TUV, CE, RoHS, REACH
Meet multinational export standards

Flexible OEM/ODM Support

Label customization
Engineering support for panel design

Upgrade Your DC System with HIITIO UL-Certified Protection!

Protect your DC system with HIITIO UL-Certified DC Miniature Circuit Breakers, engineered for high-voltage safety and reliable fault interruption. Ideal for solar PV, energy storage, EV charging, and industrial DC distribution, HIITIO delivers certified protection, stable performance, and long-term durability you can trust.