Moulded Case Circuit breaker (MCCB)
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Moulded Case Circuit breaker (MCCB)
MCCB
The HTM6, HTM6LY, HTM6RT, HTM6E and HTM6EL series of moulded case circuit breakers are newly upgraded devices developed...
Product Overview
What This Model Does
The HTM6, HTM6LY, HTM6RT, HTM6E and HTM6EL series of moulded case circuit breakers are newly upgraded devices developed by Hunter Group Co., Ltd. They are designed for AC 50Hz distribution systems with a rated working voltage of 690V and a rated current range from 10A to 800A. These breakers provide protection against overload, short circuit, and undervoltage, and can also handle infrequent motor starting. The STM6DC series is the DC version, suitable for DC systems up to 1000V and rated current 10A to 800A. Both series are built to IEC60947-2 and GB14048.2, feature a compact size, high breaking capacity, and short arc flashover. They can be installed vertically or horizontally, with wiring from top or bottom, and are polarity-free for DC models.
Key Benefits
- Protects circuits and equipment against overload, short circuit, and undervoltage in AC and DC systems
- High breaking capacity with current-limiting technology reduces peak short-circuit current and I2t energy
- Compact design allows space-saving installation in distribution boards and control cabinets
- U-shaped static contact enables pre-breaking technology, improving arc extinction and reducing damage
- Supports top and bottom wiring, and polarity-free connection for DC models
- Can be used for infrequent motor starting and protection without additional components
Who It Is For
- Electrical wholesalers supplying industrial and commercial distribution equipment
- Panel builders integrating MCCBs into control cabinets and switchgear assemblies
- Solar EPC contractors installing DC distribution systems with high voltage and current
- Manufacturers of industrial machinery needing reliable circuit protection
- OEM/ODM buyers sourcing MCCBs for branded distribution or control systems
Problems It Solves
- A conventional breaker fails to limit short-circuit current, leading to higher energy release and equipment damage
- Lack of space in control cabinets prevents installation of multiple protection devices
- DC systems require polarity-free breakers to simplify wiring and reduce installation errors
- Motor startup causes repeated tripping without proper protection and control
- Inadequate breaking capacity leads to arc flash and safety risks in high-current circuits
Application Scenarios
- Industrial control panels where space is limited and high breaking capacity is required
- Commercial buildings with AC 50Hz distribution systems needing reliable overload and short-circuit protection
- Solar power systems using DC distribution with voltages up to 1000V and currents up to 800A
- Factories and plants requiring motor protection during infrequent startup operations
- Electrical distribution boards where multiple breakers are installed in tight spaces
Technical Features
How It Is Built
- Rated working voltage AC 690V, DC 1000V for STM6DC series
- Rated current range from 10A to 800A for both AC and DC versions
- Rated short-circuit breaking capacity with current-limiting capability
- U-shaped static contact enables pre-breaking technology to reduce arc energy
- Peak short-circuit current and I2t energy significantly lower than prospective values
- Supports top and bottom wiring, polarity-free for DC models
- Can be installed vertically or horizontally
- Mechanical and electrical life designed for industrial duty
- Complies with IEC60947-2 and GB14048.2 standards
Materials and Construction
- Flame-retardant moulded housing with high mechanical strength
- U-shaped static contact made of high-conductivity alloy for pre-breaking function
- Moving contact system with silver alloy for low contact resistance and long life
- Insulating base and internal partitions for arc suppression and phase isolation
- Robust terminal blocks for top and bottom wiring with secure clamping
Quality Control
- Trip characteristic verified against IEC60947-2 and GB14048.2 requirements
- Short-circuit breaking capacity tested at rated values with current-limiting verification
- Pre-breaking function confirmed through arc energy and peak current measurement
- Dielectric and insulation resistance tests performed before packing
- Wiring and terminal torque checked for consistency and safety
Specifications
Stated Ratings for This Model
| Standards Compliant | IEC60947-2, GB14048.2 |
|---|---|
| Rated Voltage | AC 690V, DC 1000V |
| Rated Current | 10A to 800A |
| Frequency | 50Hz |
| Rated Short-circuit Breaking Capacity | Current-limiting |
| Insulation Voltage | 1000V |
| Installation Type | Vertical or horizontal |
| Wiring Connection | Top or bottom entry |
| Polarity | Polarity-free for DC models |
| Arc Flashover | Short flashover |
| Contact System | U-shaped static contact with pre-breaking technology |
| Application | AC distribution systems, DC systems, motor protection, infrequent starting |
Ratings are as published for this model. Where a value is not published we mark it TBC rather than estimating it.
Manufacturing Process
- Moulding of the flame-retardant housing and internal structural components
- Precision machining of contact system and U-shaped static contact
- Assembly of the thermal-magnetic trip unit and arc suppression chamber
- Installation of terminal blocks and wiring connectors
- Integration of auxiliary switches, shunt releases, and undervoltage releases as required
- Final calibration and functional testing of trip characteristics and breaking performance
Customization Options
- Rated current selected from 10A to 800A per order
- Pole count and configuration supplied as per application needs
- Auxiliary switches, shunt releases, and undervoltage releases available as options
- ODM branding on housing and packaging upon request
- Custom terminal cap and wiring configuration available for special applications
Comparison
How It Compares
| Conventional MCCB | Higher breaking capacity with current-limiting and pre-breaking technology reduces arc energy and equipment damage |
|---|---|
| MCB with external protection | One integrated device instead of multiple components, though MCCB has higher current rating |
| DC breaker without polarity-free design | Polarity-free connection simplifies DC wiring and reduces installation errors |
| Breaker without pre-breaking | U-shaped contact reduces arc duration and energy, improving safety and longevity |
Use Guide
- Mount the breaker on a DIN rail or panel using the provided mounting hardware
- Connect the power supply to the top or bottom terminals as required, ensuring correct polarity for DC models
- Verify all connections are tight and terminals are secured
- Perform a manual operation to ensure the breaker moves freely and latches properly
- Test the trip function under load to confirm correct operation
- Install auxiliary components such as shunt release or undervoltage release if required
- Label the breaker and document its settings for future maintenance
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View ProductFAQ
Questions About the MCCB
What is the rated current range for the HTM6 series
The HTM6 series covers rated currents from 10A to 800A.
Does the STM6DC series support DC systems
Yes, the STM6DC series is designed for DC systems up to 1000V and rated current 10A to 800A.
Can the breaker be wired from top or bottom
Yes, both top and bottom wiring are supported for AC and DC models.
Is the DC version polarity-free
Yes, the STM6DC series is polarity-free, allowing flexible wiring in DC systems.
What standards do these breakers comply with
They comply with IEC60947-2 and GB14048.2 for AC and DC applications.
Can I add auxiliary switches or shunt releases
Yes, auxiliary switches, shunt releases, and undervoltage releases are available as optional components.
What is the minimum order quantity and lead time
Both depend on the current rating, configuration, and customization. Contact [email protected] with your model and quantity for a current response.
Get a Quotation for the MCCB
Tell us the ratings, pole counts and quantities you need and we will price this model directly.