Miniature Circuit Breaker
Miniature Circuit Breaker: ZSEE B series, suitable for circuits with a rated voltage up to 400V and a rated current up to 125A, used for overcurrent protection of circuit facilities and electrical equipment in buildings and similar places. It can also be used for infrequent switching operations.
Compliance Standards
National Standards
GB 10963 “Overcurrent Protection Circuit Breakers for Household and Similar Places”
GB 14048.2 “Low-voltage Switchgear and Controlgear: Circuit Breakers”
GB 14048.3 “Low-voltage Switchgear and Controlgear: Switches, Isolators, Switch-Disconnectors, and Fuse-Combination Units”
GB 16917.1 “Residual Current Operated Circuit Breakers with Overcurrent Protection for Household and Similar Uses (RCBO)”
Environmental Conditions and Applications
- The installation location’s altitude does not exceed 2000m;
- Ambient air temperature is between -5℃ and +40℃, with the average temperature over 24 hours not exceeding +35℃;
- At a temperature of +40℃, the relative humidity of the air does not exceed 50%, and at lower temperatures, higher relative humidity is allowed, such as 90% at +20℃;
- Pollution level 2 (i.e., “non-conductive pollution under normal conditions, but temporary conductivity due to condensation has been considered”);
- Vertical installation with a tolerance of ±5°;
- Terminal devices are installed on TH35-7 type mounting rails.
Product Features
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Ensuring Short-Circuit Breaking Capacity
The miniature circuit breaker product has a maximum short-circuit breaking capacity of 10kA. -
Ensuring Quick Disconnection
In the event of a short circuit, the breaker can disconnect quickly without interference from power supply conditions or selective interference from instantaneous characteristic curves, ensuring the protection of personnel, electrical equipment, and circuits. -
Vertical Installation Stability on DIN Rails
After the MCB is installed onto the DIN rail, the molded plastic component (mounting clip) attached to the bottom of the miniature circuit breaker improves its vertical stability, eliminating torsional stress and counteracting force on the breaker. Comparing breakers between competitors, differences in mounting clip design play a significant role. -
Unique Mounting Clip for Securing and Removing Miniature Circuit Breakers on DIN Rails
The unique mounting clip allows for both normal fastening on the DIN rail and easy removal of the miniature circuit breaker from a row of devices without needing to disconnect the entire connection circuit.
Other features: The clip does not detach from the main body of the miniature circuit breaker, and no additional accessories such as stainless steel springs are required.
-
Strong Terminal Positioning
After riveting, the terminal can move freely up and down. There is a good locking mechanism for the torque of the screw, preventing the terminal post from rotating arbitrarily. When the terminal screw is loosened, it will not fall out of the housing. -
Terminals Can Accommodate Large Cross-Sectional Wires
Solid wires with a cross-sectional area of 25mm² and stranded wires with a cross-sectional area of 16mm² can carry a current of up to 63A. When installing large cross-sectional wires for high-current input, additional terminals are not required.
Tripping Types
| Instantaneous Tripping Types for Miniature Circuit Breakers | Tripping Current Range |
|---|---|
| B | 3In~5In |
| C | 5In~10In |
| D | 10In~20In |
ZSEEB1 Series Miniature Circuit Breakers
Model Description
Example of selection: ZSEE B1-63/3 C 16
ZSEE, miniature circuit breaker, rated short-circuit breaking capacity Icn = 10kA, frame size rated current Inm = 63A, three poles, instantaneous tripping type C, rated current In = 16A.
Technical Specifications
Functional Features
- Precision bimetal thermal overload tripping device for time-delayed protection of circuits;
- Electromagnetic solenoid high-speed tripping device for short-circuit protection of circuits;
Prevents overloading of the distribution system (in cases where no short-circuit fault occurs but there is a risk of overheating that could damage wires and cables);
Prevents short circuits in the distribution system and electrical devices (e.g., faults caused by circuit errors or incorrect connections).
External Dimensions (mm)
ZSEEB1-63 Series Circuit Breaker Accessories
| Model Name | U3+O3 Over/Under Voltage Tripping Device | F3 Auxiliary Switch | SD3 Alarm Switch | S3+F3 Shunt + Auxiliary Tripping Device |
|---|---|---|---|---|
| Appearance |
 |
 |
 |
 |
| Rated Voltage (Ue) | AC 230V | |||
| Working Voltage Range | 70~100% Us | 70~100% Us | 70~100% Us | |
| Rated Control Voltage (Us) | AC400/230V DC130/48/24V | AC/DC110V~400V (no note) AC/DC24V~48V (needs notation) |
||
| Rated Insulation Voltage (Ui) | 500V | 500V | 500V | 500V |
| Insulation Strength | 2000V/min | 2000V/min | 2000V/min | 2000V/min |
| Overvoltage Tripping Range | 280V ±5% | |||
| Undervoltage Tripping Range | 170V ±5% | |||
| Mechanical Electrical Life | 100,000 times | 100,000 times | 100,000 times | 100,000 times |
| Contact Capacity | AC: 3A/415V DC: 1A/130V AC: 6A/240V DC: 2A/48V DC: 6A/24V |
AC: 3A/400V DC: 1A/130V AC: 6A/230V DC: 9A/125V |
AC: 3A/400V DC: 1A/130V AC: 6A/230V DC: 9A/125V |
|
| Installation Position | Left | Left | Left | Left |
| Width | 18mm | 9mm | 9mm | 18mm |
| Wiring Diagram |
 |
 |
 |
 |
| Functional Role | Does not automatically trip in case of over/undervoltage | Indicates ON/OFF status of the related circuit breaker | Used to connect ON/OFF auxiliary contacts, tripping indicator shows breaker is off | Remote control automatic tripping of ZSEEB1 |
ZSEEB2 Series Miniature Circuit Breakers
Model Description:
Selection Example:
ZSEEB2-63/4D16
ZSEE, miniature circuit breaker, rated short-circuit breaking capacity Icn=6kA, frame rated current Inm=63A, four poles, instantaneous tripping type D, rated current In=16A.
ZSEEB2-32/ C32
ZSEE, miniature circuit breaker, frame rated current Inm=32A, 1P+N, instantaneous tripping type C, rated current In=32A.
Note: For 32-frame products, the number of poles 1P+N is not marked by default.
Technical Specifications
Functional Features
- Precise bimetallic thermal overload trip unit provides delayed protection for the circuit;
- Electromagnetic high-speed trip unit with solenoid for short-circuit protection;
Prevents distribution system overload (in case no short-circuit fault occurs, but overheating overload situations that may damage the wiring arise); Prevents short-circuits in the distribution system and electrical devices (such as faults caused by wiring errors or other circuit failures).
Dimensions (mm)
ZSEEB2-63 Series Circuit Breaker Accessories
| Model Name | OUV2 Over/Under Voltage Trip Unit | F2 Auxiliary Switch | SD2 Alarm Switch | MXF2 Shunt+Auxiliary Trip Unit |
|---|---|---|---|---|
| Appearance |
 |
 |
 |
 |
| Rated Operating Voltage (Ue) | AC 230V | AC 415/240V DC 130/48/24V |
AC 415/240V DC 130/48/24V |
AC 230V / DC 24V |
| Operating Voltage Range | 70~100% Us | 70~100% Us | ||
| Rated Control Voltage (Us) | AC 400, 230, 115V | AC/DC 110V~400V (not marked) AC/DC 24V~48V (marked) |
||
| Rated Insulation Voltage (Ui) | 500V | 500V | 500V | |
| Insulation Strength | 2000V/min | 2000V/min | ||
| Overvoltage Trip Range | 280V ±5% | |||
| Undervoltage Trip Range | 170V ±5% | |||
| Mechanical Electrical Life | 100,000 times | 100,000 times | 100,000 times | 100,000 times |
| Contact Capacity | AC: 3A/415V AC: 6A/240V DC: 1A/130V DC: 2A/48V DC: 6A/24V |
AC: 3A/415V AC: 6A/240V DC: 1A/130V DC: 2A/48V DC: 6A/24V |
AC: 3A/400V AC: 6A/230V AC: 9A/125V |
|
| Installation Position | Left | Left | Left | Left |
| Width | 18mm | 9mm | 9mm | 18mm |
| Wiring Diagram |
 |
 |
 |
|
| Function | Automatically trips under overvoltage or undervoltage conditions | Indicates “off” and “on” status of the associated breaker | Auxiliary contact, indicates breaker open status when tripped, for ON/OFF connection | Combines the functions of auxiliary switch and shunt trip unit |
Note: For ZSEEB2 series breakers, up to 2 accessories can be installed on the left side.
ZSEEB2S Series Miniature Circuit Breakers
Model Description
Selection Example:
ZSEEB2S-63/4D16
ZSEE, miniature circuit breaker, rated short-circuit breaking capacity Icn=6kA, frame rated current Inm=63A, four poles, instantaneous tripping type D, rated current In=16A.
Technical Specifications
Functional Features:
- Precise bimetallic thermal overload trip unit provides delayed protection for the circuit;
- Electromagnetic high-speed trip unit with solenoid for short-circuit protection;
- Prevents distribution system overload (in case no short-circuit fault occurs, but overheating overload situations that may damage the wiring arise);
- Prevents short-circuits in the distribution system and electrical devices (such as faults caused by wiring errors or other circuit failures).
- The breaker has a high short-circuit breaking capacity;
- When the breaker trips due to overcurrent, the handle moves to the off position, prompting users to quickly address the fault.
Dimensions (mm)
ZSEEB2S-63 Series Circuit Breaker Accessories
| Model Name | OUV1 Over/Under Voltage Trip Unit | F1 Auxiliary Switch | SD1 Alarm Switch | MXF1 Shunt+Auxiliary Trip Unit |
|---|---|---|---|---|
| Appearance |
 |
 |
 |
 |
| Rated Operating Voltage (Ue) | AC 230V | |||
| Operating Voltage Range | 70~100% Us | 70~100% Us | ||
| Rated Control Voltage (Us) | AC 400, 230, 115V | AC/DC 110V~400V (not marked) AC/DC 24V~48V (marked) |
||
| Rated Insulation Voltage (Ui) | 500V | 500V | 500V | |
| Insulation Strength | 2000V/min | 2000V/min | ||
| Overvoltage Trip Range | 280V ±5% | |||
| Undervoltage Trip Range | 170V ±5% | |||
| Mechanical Electrical Life | 100,000 times | 100,000 times | 100,000 times | 100,000 times |
| Contact Capacity | AC: 3A/415V AC: 6A/240V DC: 1A/130V DC: 2A/48V DC: 6A/24V |
AC: 3A/415V AC: 6A/240V DC: 1A/130V DC: 2A/48V DC: 6A/24V |
AC: 3A/400V AC: 6A/230V AC: 9A/125V |
|
| Installation Position | Right | Left | Left | Right |
| Width | 18mm | 9mm | 9mm | 18mm |
| Wiring Diagram |
 |
 |
 |
 |
| Function | Automatically trips under overvoltage or undervoltage conditions | Indicates “off” and “on” status of the associated breaker | Auxiliary contact, indicates breaker open status when tripped, for ON/OFF connection | Combines the functions of auxiliary switch and shunt trip unit |
Note: ZSEEB2S series circuit breakers can install up to 2 accessories.
ZSEEB1L Series Miniature Circuit Breakers with Residual Current Protection
Model Description
Example of model selection: ZSEEB1L-63/4C16 30mA
ZSEE, miniature circuit breaker with residual current protection, rated short-circuit breaking capacity Icn=10kA, frame rated current Inm=63A, four poles, instantaneous trip type C, rated current In=16A, residual operating current 30mA.
Technical Specifications
Features
- Provides four protections: leakage, isolation, short-circuit, and overload;
- Offers personal protection against indirect contact;
- Provides supplementary protection against direct contact;
- Protects electrical equipment from insulation failures;
- Suitable for circuits with AC 50Hz or 60Hz, rated voltage 230V/400V, and rated current not exceeding 63A. Mainly used for personal protection against electric shocks, overcurrent and short-circuit protection for buildings and similar installations, and fire risk protection due to ground fault currents caused by insulation damage of electrical equipment;
- Circuit breakers are suitable for various applications, including industrial, commercial, high-rise, and residential buildings.
Dimensions (mm)
Dimensions table (mm)
| Poles | 1P+N | 2P | 3P | 3P+N | 4P |
|---|---|---|---|---|---|
| L(Inm≤32A) | 45 | 63 | 90 | 99 | 117 |
| L(Inm>32A) | 54 | 72 | 103.5 | 117 | 135 |
| H | 76.8 | 77.8 | 77.8 | 77.8 | 77.8 |
ZSEEB2L Series Miniature Circuit Breakers with Residual Current Protection
Model Description
Example of model selection: ZSEEB2L-63/4C16 30mA
ZSEE, miniature circuit breaker with residual current protection, rated short-circuit breaking capacity Icn=6kA, frame rated current Inm=63A, four poles, instantaneous trip type C, rated current In=16A, residual operating current 30mA.
Technical Specifications
Features
- Provides four protections: leakage, isolation, short-circuit, and overload;
- Offers personal protection against indirect contact;
- Provides supplementary protection against direct contact;
- Protects electrical equipment from insulation failures;
- Suitable for circuits with AC 50Hz or 60Hz, rated voltage 230V/400V, and rated current not exceeding 63A. Mainly used for personal protection against electric shocks, overcurrent and short-circuit protection for buildings and similar installations, and fire risk protection due to ground fault currents caused by insulation damage of electrical equipment;
- 32A and 40A frame products can disconnect both the live and neutral lines simultaneously;
- Circuit breakers are suitable for various applications, including industrial, commercial, high-rise, and residential buildings.
Dimensions (mm)
Dimensions table (mm)
| Poles | 1P+N | 2P | 3P | 3P+N | 4P |
|---|---|---|---|---|---|
| L(Ie≤32A) | 45 | 63 | 90 | 99 | 117 |
| L(Ie>32A) | 54 | 72 | 103.5 | 117 | 135 |
| H | 76.8 | 77.8 | 77.8 | 77.8 | 77.8 |
ZSEEB2SL Series Miniature Circuit Breakers with Residual Current Protection
Model Description
Example of model selection: ZSEEB2SL-63/4C16 30mA
ZSEE, miniature circuit breaker with residual current protection, rated short-circuit breaking capacity Icn=6kA, frame rated current Inm=63A, four poles, instantaneous trip type C, rated current In=16A, residual operating current 30mA.
Technical Specifications
Features
- Provides four protections: leakage, isolation, short-circuit, and overload;
- Offers personal protection against indirect contact;
- Provides supplementary protection against direct contact;
- Protects electrical equipment from insulation failures;
- Suitable for circuits with AC 50Hz or 60Hz, rated voltage 230V/400V, and rated current not exceeding 63A. Mainly used for personal protection against electric shocks, overcurrent and short-circuit protection for buildings and similar installations, and fire risk protection due to ground fault currents caused by insulation damage of electrical equipment;
- Circuit breakers are suitable for various applications, including industrial, commercial, high-rise, and residential buildings.
Dimensions (mm)
ZSEEB3SL Series Miniature Circuit Breakers with Residual Current Protection
Model Description
Example of model selection: SIW B3SL-32/ C 16 30mA
ZSEE, miniature circuit breaker with residual current protection, rated short-circuit breaking capacity Icn=4.5kA, frame rated current Inm=32A, 2P, instantaneous trip type C, rated current In=16A, residual operating current 30mA.
Technical Specifications
Dimensions (mm)
ZSEEG3 Series Isolating Switches
Model Description
Example of model selection: ZSEE G3-125/4Ie=100
ZSEE, isolating switch, rated heating current Ith=125A, four poles, rated current Ie=100A.
Technical Specifications
Features
- Locking function for on and off positions;
- Contact status indicator for open and closed positions;
- High rated making capacity;
- High short-time withstand current;
- Mainly used as the main switch for terminal combined electrical appliances.
Dimensions (mm)
ZSEEB-GQ Series Self-Resetting Over/Under Voltage Protectors
Application Range
Self-resetting over/under voltage protectors are suitable for AC voltage 230V or 380V, frequency 50Hz, and rated working current of 63A or less. They provide protection for electrical equipment against over/under voltage caused by neutral line faults in single-phase or three-phase circuits, such as in distribution circuits for residential meter boxes.
Model Description
Example of model selection: ZSEEB-GQ-32/2
ZSEE, self-resetting over/under voltage protector, rated working current In=32A, two poles.
Technical Specifications
Features
- Cuts off the circuit when undervoltage occurs, and automatically resets and reconnects the circuit after the voltage returns to normal with a delay, without manual operation;
- The protector does not misoperate during transient or temporary overvoltage in the circuit;
- The protector does not connect the circuit when the voltage is unstable due to poor contact or in cases of sudden power loss and restoration;
- The protector exhibits an inverse time characteristic with an action time of ≤1s;
- Wiring method: Bottom entry and top exit. (*Note: For top entry and bottom exit, please contact the company’s marketing department.)
Dimensions (mm)
