AC MCCB Thermal Magnetic

This molded case circuit breaker is designed for AC low-voltage distribution systems that require reliable overload, short-circuit, and isolation protection. It is suitable for general power distribution, new energy generation and distribution systems, multi-source distribution networks, inverters, grid connection equipment, and industrial motor-related circuits.

The product range supports compact installation, high breaking capacity, and multiple operating methods. It can be configured for direct operation, rotary handle operation, or electric operation, and supports accessories such as shunt release, undervoltage release, auxiliary contacts, alarm contacts, and overload alarm functions.

• Wide frame range: Ampere frame ratings cover 63A, 125A, 250A, 400A, 630A, and 800A.
• Thermal magnetic protection: Compound tripping supports overload and short-circuit protection in AC distribution systems.
• High breaking capacity options: L, M, and H breaking capacity grades support standard, higher, and highest performance requirements.
• Flexible pole configuration: 3-pole and 4-pole versions are available according to distribution system design.
• AC400V and AC690V operation: Selected models support AC400V or AC690V working voltage, with AC400-800V product family coverage.
• Multiple operation methods: Direct operation, turn handle operation, and electric operation options are available.
• Accessory compatibility: Supports shunt release, undervoltage release, auxiliary contacts, alarm contacts, electric operation, and rotary handle operation.
• Suitable for demanding environments: Designed for humidity, salt spray, oil mist, mold, radiation, and earthquake condition considerations according to installation requirements.

This breaker is recommended for AC distribution systems that require dependable protection, high interrupting performance, and accessory-based control or signaling functions.

• General low-voltage power distribution panels
• Photovoltaic and energy storage distribution systems
• Inverter and grid connection cabinets
• Industrial motor and equipment protection circuits
• Multi-source distribution networks
• Commercial and industrial switchboards

• Ambient air temperature: -5°C to +40°C; 24-hour average temperature should not exceed +35°C.
• Installation altitude should not exceed 2000m.
• Relative humidity should not exceed 50% at +40°C; higher humidity is acceptable at lower temperature, such as 90% at 20°C.
• Installation inclination should not exceed +/-22.5°.
• The product should be installed in a location free from explosion hazards, conductive dust, metal corrosion, and insulation damage.
• The installation location should not be exposed to rain or snow.

Before ordering, confirm ampere frame rating, rated current, pole number, breaking capacity grade, operation method, accessory requirements, installation wiring method, working voltage, and application environment. For AC690V circuits or high-fault-current panels, verify both Icu and Ics ratings against the project short-circuit calculation.

Send us your rated voltage, rated current, frame size, pole configuration, breaking capacity level, operation method, accessory requirements, and quantity. Our team can help select the proper molded case breaker configuration for safe, reliable AC power distribution.