Tesla MCB10K3P10 Miniature Circuit Breaker 10 Amp Three Pole 10kA C Curve DIN Rail or Chassis Mount

Description

Three pole 10 kA protection in a small frame.

Fault levels near a large supply can exceed what a 6 kA device was built to interrupt, and a three phase circuit needs all three poles cleared together. The Tesla MCB10K3P10 is a three pole 10 amp C curve MCB with Icn equal to Ics at 10 kA, Energy Limiting Class 3 and contact position indication.

Key Features

• 10 A rated current, three pole
• 10 kA rated short-circuit capacity (Icn)
• Ics equal to Icn for full 10 kA service breaking capacity
• Energy Limiting Class 3
• C curve tripping characteristic, supplied as C10
• Overload and short-circuit protection, plus isolation function
• Contact position indication
• DIN rail and chassis mount
• Tesla part number MCB10K3P10, GTS code MCB10K3P10
• Sold singly, box of 4, carton of 40

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Why 10 kA on a Small Three Pole Breaker

Breaking capacity is the largest fault current a device can interrupt safely. It is set by the supply, not by the load, which is why a 10 amp breaker can need the same fault rating as a much larger one on the same board. Prospective fault current is a property of where the board is, how large the service feeding it is, and how close it sits to the transformer.

That is the case for a 10 kA device at a low rated current. The rating is not about the size of the circuit below it. It is about surviving and clearing what the supply above it can deliver.

Icn Equals Ics on This Breaker

Two figures describe fault performance. Icn is the rated short-circuit capacity, the maximum the device can interrupt. Ics is the service capacity, the level it can interrupt and then continue in service afterwards. On many breakers Ics is a fraction of Icn.

Tesla states Icn equal to Ics at 10 kA on this range, so the service figure matches the headline figure. Energy Limiting Class 3 sits alongside it, describing how tightly the device caps the energy that gets through during a fault before the contacts finish opening.

Three Poles, Mounting and Isolation

All three poles are operated by one mechanism, so a fault on any phase opens all three together rather than leaving the circuit running on the remaining two. The same mechanism gives the isolation function, meaning the device is rated to be used as the disconnection point for work downstream, not only as automatic protection.

Contact position indication shows the true state of the contacts rather than the position of the toggle alone. Mounting is on DIN rail or chassis, so it suits both a standard modular board and a chassis-mounted assembly. Tesla builds the 10 kA range in one, two and three pole versions. The unit ships singly, in boxes of 4 and cartons of 40.

Q: What is the difference between Icn and Ics on the MCB10K3P10?
A: Icn is the rated short-circuit capacity and Ics the service capacity. On this breaker they are equal at 10 kA, so it interrupts a full 10 kA fault and remains in service.

Q: Can the Tesla MCB10K3P10 be used to isolate a circuit?
A: Yes. Tesla lists a function of isolation alongside overload and short-circuit protection, and contact position indication shows the true contact state.

Q: How does the 10 kA version differ from the 6 kA three pole breaker?
A: The 10 kA model interrupts a higher prospective fault current, with Icn equal to Ics and Energy Limiting Class 3. Choose it where the fault level at the board exceeds 6 kA.

Warranty

This product is backed by an extended manufacturer warranty - click here for details.