Tesla MCB10K1P40 Miniature Circuit Breaker 40 Amp Single Pole 10kA C Curve DIN Rail or Chassis Mount

Description

Serious fault current protection in a single pole.

Boards fed from larger supplies can see fault currents a 6 kA device was never built to interrupt. The Tesla MCB10K1P40 is a single pole 40 amp C curve breaker rated at a full 10 kA, with a service capacity that matches it and Energy Limiting Class 3 capping let-through energy.

Key Features

• 40 A rated current, single 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 C40
• Overload and short-circuit protection, plus isolation function
• Contact position indication
• DIN rail and chassis mount
• Tesla part number MCB10K1P40, GTS code TESMCB10K1P40
• Sold singly, box of 12, carton of 120

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Why 10 kA Matters

Breaking capacity is the largest fault current a breaker can interrupt safely. The closer a board sits to the supply transformer, and the larger the service feeding it, the higher the prospective fault current at that point. Where a 6 kA device is marginal, a 10 kA device restores the margin.

Fault levels are a property of the supply, not the load, so two boards running identical final subcircuits can need very different breakers. Specifying to the prospective fault current calculated at the board, rather than to habit, is what keeps the protection valid.

Icn Equals Ics on This Breaker

Two figures describe fault performance. Icn is the ultimate capacity the breaker can interrupt once. Ics is the service capacity it can interrupt and still return to normal duty afterwards. Many breakers quote a headline Icn and a materially lower Ics, leaving the device fit only for replacement. Tesla rates this MCB at Icn = Ics = 10 kA, so there is no step down between the number on the front and what it will do repeatedly.

C Curve and Class 3 Energy Limiting

The C characteristic is the general-purpose curve. It rides through the brief inrush drawn by motors, transformers and switch-mode supplies at energisation, while still clearing a genuine short circuit quickly. Energy Limiting Class 3 is the tightest of the three classes and describes how hard the breaker caps let-through energy during a fault, which means less thermal stress on the cable, terminations and equipment downstream.

Mounting and Isolation Duty

Tesla lists the 10 kA range for both DIN rail and chassis mounting, keeping it usable in older boards and panels never built around top-hat rail. The breaker also carries the isolation function, so it can positively disconnect the circuit it protects rather than acting purely as a protective device. Contact position indication shows the true state of the contacts.

What does the 10 kA rating on the Tesla MCB10K1P40 mean?
It is the rated short-circuit capacity, meaning the fault current the breaker can interrupt without failing. Tesla rates this model at Icn = Ics = 10 kA, so it stays fit for duty after clearing a full-rated fault.

Is the Tesla MCB10K1P40 a C curve breaker?
Yes. Tesla builds its 10 kA miniature circuit breaker range to a C curve characteristic, and this single pole 40 amp model is supplied as C40. It also carries Energy Limiting Class 3, the tightest let-through energy class.

Can the MCB10K1P40 be fitted without a DIN rail?
Yes. Tesla lists the 10 kA MCB range as both DIN and chassis mount, so it suits boards and panels not built around standard top-hat rail. It is sold individually, packed 12 to a box and 120 to a carton.

Warranty

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