Tesla TMCB3P20D HPC2 Circuit Breaker 20 Amp Three Pole 415V 6kA Rating D Curve Motor Start

Description

D curve protection built for motor inrush.

Motor loads draw a heavy surge the instant they energise, and a standard breaker often reads that surge as a fault. The Tesla TMCB3P20D is a three pole, 20 amp D curve miniature circuit breaker from the HPC2 Series, rated at 415V with a 6 kA breaking capacity, and supplied by GTS as a motor start device.

Key Features

• Rated current: 20A
• Number of poles: 3 pole
• Rated voltage: 415V
• Tripping curve: D
• Breaking capacity: 6000A (6 kA)
• Rated frequency: 50/60Hz
• Module width: 3 module
• Standard: IEC/EN 60898
• Approval number: V08030
• IP rating: IP20
• Mechanical life: 10,000 cycles
• Electrical life: 4,000 cycles
• Bi-metal thermal element for overload tripping
• Pillar terminal with clamp
• Accepts rigid conductor up to 25mm2
• Sold individually, box quantity of 4, outer quantity of 40

Order now for fast dispatch Australia-wide.

Why the D Curve Matters

A tripping curve describes how quickly a breaker responds to overcurrent. The D characteristic holds its magnetic trip point higher than the B or C characteristics, so a short, high magnitude inrush is allowed to pass without nuisance tripping. Once the surge settles, normal overload and short circuit protection continues as usual.

That behaviour is why GTS lists this unit as a motor start breaker. Tesla states the D curve characteristics suit most applications, and positions the 6 kA HPC2 range across commercial, domestic and industrial installations.

The trade-off is worth understanding. A higher magnetic threshold means a fault must reach a larger current before the instantaneous element acts, so a D curve device is specified deliberately rather than used as a general substitute.

Three Pole Switching at 415V

All three poles operate together on a common trip bar, so a fault detected on any one phase disconnects the whole circuit. For three phase equipment in an Australian switchboard, that matters: leaving a motor running on two phases risks winding damage. The 415V rating aligns with standard Australian three phase distribution.

At three modules wide the breaker occupies a predictable amount of board space, keeping switchboard layouts and future additions straightforward. Rated frequency is 50/60Hz.

Protection and Build

Protection covers both overload and short circuit conditions in the electrical distribution system. Overload tripping uses a bi-metal element that heats and bends in proportion to sustained excess current, giving a delayed response that tolerates ordinary load variation. Short circuit protection is handled by the magnetic element, which acts at the D curve threshold.

Terminals are pillar type with a clamp and accept rigid conductor up to 25mm2. The device carries an IP20 rating and is built to IEC/EN 60898 under approval number V08030. Rated mechanical life is 10,000 cycles, with an electrical life of 4,000 cycles.

The same three pole D curve format runs across the HPC2 6 kA range at 10, 16, 20, 25, 32, 40, 50 and 63 amps.

Is the Tesla TMCB3P20D suitable for motor circuits?
Yes. GTS supplies the TMCB3P20D as a motor start breaker. Its D tripping curve holds a higher magnetic trip threshold, which allows motor starting inrush to pass without nuisance tripping while retaining overload and short circuit protection.

What is the breaking capacity of the Tesla TMCB3P20D?
The breaking capacity is 6000A, or 6 kA, at a rated voltage of 415V. The device is manufactured to IEC/EN 60898 and carries approval number V08030, with a rated frequency of 50/60Hz.

How much cable can the Tesla TMCB3P20D terminals accept?
The breaker uses pillar terminals with a clamp and accepts rigid conductor up to 25mm2. It is three modules wide and rated IP20.

Warranty

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