Tomzn 3-Phase 4P 63A AC Circuit Breaker

The Tomzn 3-Phase 4P 63A AC Circuit Breaker is a four-pole miniature circuit breaker for compatible three-phase AC distribution systems. Its 4P arrangement switches three phase conductors and the neutral together, supporting organized isolation in suitably designed commercial, workshop and building distribution panels. The breaker is listed at 63A for 230/400V AC applications.

Four-pole switching for three-phase distribution

A four-pole breaker is commonly selected where all three phases and the neutral need to be disconnected together. This can simplify safe isolation of the downstream circuit when the system design requires switched neutral operation. The neutral pole should not be described as guaranteed overcurrent protection unless the exact product markings and technical documentation confirm that function.

This TOMZN breaker is intended for AC use. It should not be substituted for a DC-rated circuit breaker, motor protection breaker, residual-current device, surge protective device or automatic transfer switch. Each of those products performs a different safety function.

Select the Tomzn 3-Phase 4P 63A AC Circuit Breaker only after checking the calculated load, cable capacity and available fault current.

Listed product details

• Brand: TOMZN
• Product type: Miniature Circuit Breaker (MCB)
• Configuration: 4P for three phases and neutral
• Rated current: 63A
• Listed voltage: 230/400V AC
• Listed frequency: 50/60Hz
• Listed trip curve: C curve
• Listed breaking capacity: 6kA
• Mounting: 35mm DIN rail

Before installation, compare every rating above with the printing on the actual supplied unit. Product labels and model revisions can vary. The system designer must confirm that the voltage, frequency, trip curve and short-circuit breaking capacity are suitable for the installation location.

Suitable applications

The Tomzn 3-Phase 4P 63A AC Circuit Breaker may be considered for main or sub-distribution circuits in shops, offices, apartment buildings, workshops and other premises with compatible three-phase supplies. It may also be used in a properly engineered panel serving three-phase equipment, but motor or machinery circuits can require dedicated protection based on starting current and manufacturer instructions.

• Commercial three-phase distribution boards
• Workshop or small industrial sub-distribution panels
• Building services and compatible HVAC feeder circuits
• Generator or inverter output panels designed for 230/400V AC
• Other four-pole AC circuits within the printed product ratings

Explore more circuit breakers, compare suitable distribution boxes, or view the complete range of TOMZN products at HN Electric.

Tomzn 3-Phase 4P 63A AC Circuit Breaker sizing checks

The 63A marking is the breaker current rating, not a recommendation for every three-phase load. A qualified electrician must calculate the design current, select cables with adequate current-carrying capacity, apply installation and temperature derating factors, and coordinate the breaker with upstream and downstream protection.

C-curve tripping may suit circuits with moderate inrush current, but suitability depends on the actual load and fault-loop conditions. For motors, transformers or equipment with high starting current, the electrician should confirm that the selected protection meets the equipment requirements and disconnects safely during a fault.

Important installation guidance

Installation must be carried out by a qualified electrician. Isolate and lock out every incoming source before opening the panel. Test for absence of voltage with appropriate equipment, follow the terminal markings on the breaker, and keep the phase sequence consistent through the installation.

• Use conductors and terminals correctly sized for the calculated circuit load.
• Confirm the panel has sufficient DIN-rail space and a suitable enclosure rating.
• Tighten terminals to the manufacturer-specified torque.
• Do not mix AC and DC breakers or exceed the printed voltage rating.
• Provide separate residual-current and surge protection where required.
• Label the circuit clearly and test operation before energizing the load.

Order with confidence from HN Electric

Before ordering the Tomzn 3-Phase 4P 63A AC Circuit Breaker, check the product photographs, pole arrangement and label details against your panel schedule. If you are unsure whether this 4P 63A breaker is correct, share the supply voltage, connected load and installation details with HN Electric. Correct product selection and professional installation are essential for reliable circuit protection.