Tomzn 2P AC MCB Circuit Breaker – 16A to 63A

The Tomzn 2P AC MCB Circuit Breaker is a double-pole miniature circuit breaker available in 16A, 20A, 32A and 63A ratings. It is designed for compatible 230/400V AC distribution circuits and uses a listed C-type tripping characteristic. Select the required current option according to the circuit design, cable capacity and connected load.

Double-pole AC circuit protection

A 2P breaker switches two conductors together. In a suitable single-phase arrangement this commonly supports simultaneous isolation of line and neutral, subject to the system design and local wiring requirements. The product should only be used for AC circuits within the voltage, frequency and breaking-capacity markings printed on the supplied unit.

An MCB is intended to respond to overcurrent and short-circuit conditions. It does not replace a residual-current device, surge protective device, voltage protector, isolator or automatic transfer switch. A complete distribution board may require several of these functions as separate, correctly coordinated devices.

Select the Tomzn 2P AC MCB Circuit Breaker only after confirming the calculated load, conductor capacity and required fault protection.

Product specifications

• Brand: TOMZN
• Type: Miniature Circuit Breaker (MCB)
• Configuration: 2P double pole
• Current options: 16A, 20A, 32A and 63A
• Listed voltage: 230/400V AC
• Listed frequency: 50/60Hz
• Listed trip curve: C curve
• Listed breaking capacity: 6kA
• Mounting: DIN rail

Specifications can vary between product revisions, so the electrician must compare the actual unit label with the installation requirements before fitting it. Never rely only on a website description when confirming a protective device rating.

Tomzn 2P AC MCB Circuit Breaker rating selection

The correct ampere rating depends on the conductor size, installation method, ambient temperature, normal operating current and characteristics of the connected equipment. A higher rating is not automatically better. An oversized breaker may not provide the intended protection for the cable, while an undersized breaker may trip during normal use.

• 16A: may suit compatible lower-current final circuits after calculation.
• 20A: may suit circuits whose cable and expected load support this rating.
• 32A: may suit higher-current feeders or equipment circuits designed accordingly.
• 63A: may suit compatible main or sub-feeder circuits with correctly sized conductors.

These examples are general guidance rather than installation recommendations. A qualified electrician must calculate and select the final rating.

Common applications

The Tomzn 2P AC MCB Circuit Breaker may be considered for residential, shop, office and workshop distribution boards. It can also form part of a properly engineered generator or solar inverter AC output panel when the inverter manufacturer, load calculation and fault-current assessment support the selected breaker.

Browse more circuit breakers, find compatible distribution boxes, or compare other TOMZN products available from HN Electric.

Important installation checks

Installation must be carried out by a qualified electrician. Every incoming source must be isolated and verified de-energized before the panel is opened. The electrician should follow the line/load markings, maintain correct conductor identification and ensure the breaker is mounted securely on a suitable DIN rail.

• Confirm the selected current rating protects the installed cable.
• Verify the available fault current does not exceed the breaker’s marked capacity.
• Use correctly sized conductors, ferrules or lugs and suitable distribution hardware.
• Tighten terminals to the manufacturer-specified torque.
• Provide RCD and surge protection separately where the installation requires them.
• Label the protected circuit and test operation before placing it in service.

After installation, the board should be inspected periodically for discoloration, overheating, loose connections or mechanical damage. Do not reset a breaker repeatedly without identifying the cause of the trip, because a persistent fault or overloaded circuit requires professional investigation.

Order the correct rating from HN Electric

Choose the Tomzn 2P AC MCB Circuit Breaker in 16A, 20A, 32A or 63A from the available product option before checkout. Check the product photographs and printed ratings against your distribution-board schedule. If you are unsure which option is suitable, share the load, cable and supply details with HN Electric before ordering. Correct selection and professional installation are essential for dependable protection.