Tesla MCB3P125 Circuit Breaker 125 Amp Three Pole 10kA Rating C Curve 415V 35mm2 Lift-Up Terminals

Description

The largest three pole breaker in Tesla's MCB range.

Tesla's three pole 10 kA range runs 63, 80, 100 and 125 amps, and the MCB3P125 sits at the top of it. It carries 125 A across all three poles at 415/440 V, landing 35 mm2 flexible conductor in lift-up terminals that lock every strand.

Key Features

• 125 A rated current, three pole
• Highest rating in the Tesla three pole 10 kA range
• Rated voltage AC 415/440 V
• Rated short-circuit capacity (Icn) 10,000 A
• Rated service short-circuit capacity (Ics) 7,500 A
• Breaking capacity 10 kA conforming to IEC 60947-2
• C curve tripping characteristic
• Limitation class 3
• Rated frequency 50/60 Hz, AC network
• Connection capacity 35 mm2 flexible conductor
• Pillar terminal with clamp, lift-up no hot spot design
• Modular spacing 81 mm for the three pole body
• Fast closure mechanism
• Tesla part number MCB3P125, GTS code TESTMCB3P125
• Sold singly, carton of 4

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Top of the Frame, Same Terminals

The 125 A model shares its frame, terminals and spacing with the 80 A and 100 A versions. Tesla lists the same 35 mm2 flexible conductor capacity across all three, so stepping up to 125 A does not change what the terminals will take.

That matters when sizing the cable. The conductor a 125 A circuit needs is at the upper limit of what these terminals accept, so check the cable size against the 35 mm2 figure before ordering rather than after the board is built. The lift-up design captures every strand rather than letting some splay around the clamp face, which is why Tesla calls them no hot spot terminals.

Read the Ics Figure Before You Specify

Tesla publishes a rated short-circuit capacity of 10,000 A for the three pole range, and a rated service capacity of 7,500 A alongside it. The two figures do different jobs.

Icn is what the device can interrupt once. Ics is what it can interrupt and still return to normal duty afterwards. At 75 percent of Icn, the service figure is the one to specify against for anything expected to keep working after a fault. Treat a full 10 kA event as grounds for replacement.

Board Space and Curve Selection

Modular spacing is 81 mm for the three pole body, wider than a standard three module device, so confirm the gap before ordering. Fast closure is a listed feature of the mechanism, driving the contacts closed positively rather than at the speed of the toggle.

The C curve rides through the brief inrush drawn by motors, transformers and switch-mode supplies at energisation while still clearing a genuine short circuit quickly. Tesla lists the 10 kA range as suited to commercial, domestic and industrial applications.

Q: What is the breaking capacity of the Tesla MCB3P125?
A: Tesla publishes a rated short-circuit capacity (Icn) of 10,000 A and a rated service short-circuit capacity (Ics) of 7,500 A, with the breaking capacity stated as 10 kA conforming to IEC 60947-2. Specify against 7,500 A where the breaker must stay in service after a fault.

Q: Is the Tesla MCB3P125 the largest in the range?
A: Yes. Tesla lists the three pole 10 kA range at 63, 80, 100 and 125 amps, so 125 A is the top rating. All share the same 35 mm2 terminals and 81 mm modular spacing.

Q: What voltage and frequency is the Tesla MCB3P125 rated for?
A: Tesla rates the three pole 10 kA range at AC 415/440 V, 50/60 Hz, on an AC network. It is a three pole device, so all three phases are broken together.

Warranty

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