Tesla TMCB3P40D Circuit Breaker 40 Amp 415V Three Pole 6kA Rating D Curve Motor Start

Description

D curve headroom at 40 amps.

The Tesla TMCB3P40D is a three pole 40 A miniature circuit breaker from the HPC2 Series with a D tripping characteristic and 6 kA breaking capacity at 415V. GTS lists it as a motor start device, the D curve riding through inrush that a lower characteristic would read as a fault.

Key Features

• Rated current: 40 A
• Three poles, 3 module
• Rated voltage: 415V
• Breaking capacity: 6000 A
• Tripping characteristic: D
• Listed by GTS as a motor start device
• Protection against overload and short circuit in the electrical distribution system
• Bi-metal overload tripping mechanism
• Pillar terminal with clamp, rigid conductor up to 25mm2
• Rated frequency: 50/60Hz
• IP20
• Mechanical life 10000 cycles, electrical life 4000 cycles
• Standard: IEC/EN60898
• Approval number V08030
• Tesla part number TMCB3P40D
• Supplied individually, boxed in 4, outer of 40

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What the D Characteristic Changes

The tripping curve sets how long a breaker tolerates a surge before the magnetic element operates. A D characteristic holds for longer than the B or C characteristics at the same multiple of rated current, so a load that draws a large, brief surge at switch on can come up without nuisance tripping.

That is why this variant exists alongside the standard characteristic TMCB3P40. Same 40 A rating, same three poles, same 6 kA capacity, different response to inrush. If a standard characteristic device on the circuit trips at start up but runs fine once loaded, the D variant is the direct swap.

Overload and Short Circuit Duty

Two separate mechanisms do the work. A bi-metal element handles overload, heating and bending in proportion to sustained current so a slow overload clears before the cable is damaged. The magnetic element handles short circuit, operating fast on a genuine fault, in a device rated to interrupt 6000 A.

Termination is by pillar terminal with clamp, taking rigid conductor up to 25mm2. That is the full conductor capacity Tesla publishes for the HPC2 range, and it applies at 40 A as at every other rating.

Where Tesla Positions This Range

Tesla states that the 6 kA breaking capacity of these MCBs suits commercial, domestic and industrial applications, and that the D characteristic is intended to suit most applications. That is Tesla's own positioning for the HPC2 D curve family.

GTS lists the part as a motor start device, which points the same way: a D curve breaker for circuits where inrush decides the rating rather than steady state load.

Build and Rating Detail

The TMCB3P40D occupies 3 module and carries an IP20 rating. Rated frequency is 50/60Hz, suited to Australian supply. Mechanical life is 10000 cycles and electrical life 4000 cycles.

The device is built to IEC/EN60898 and carries approval number V08030. The D curve range runs 10 A to 63 A in this three pole format, so stepping up or down a rating keeps the same footprint and termination.

Q: What is the difference between the Tesla TMCB3P40D and the TMCB3P40?
A: Only the tripping characteristic. The TMCB3P40D is a D curve device for high inrush loads, while the TMCB3P40 is the standard characteristic. Both are three pole, 40 A, 6 kA.

Q: What is the breaking capacity of the Tesla TMCB3P40D?
A: It is 6000 A, or 6 kA, at a rated voltage of 415V, built to IEC/EN60898 under approval number V08030.

Q: How many modules wide is the Tesla TMCB3P40D?
A: Three. Tesla lists the three pole HPC2 D curve breakers as 3 module, and terminals accept rigid conductor up to 25mm2.

Warranty

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