Tesla RCDM3PN40 RCD/MCB Safety Switch RCBO 40 Amp 3P+N 6kA 30mA Type A C Curve 3 Module 53mm

Description

Three module three phase protection, rated 40 amps.

Rated at 40 amps, the Tesla RCDM3PN40 puts overcurrent and earth leakage protection for a three phase circuit into one three module device. A C curve trip characteristic covers overload and short circuit; 30 mA Type A sensing covers residual current. A 900 mm neutral lead is fitted.

Key Features

• Rated current: 40 A
• Number of poles: 3P+N
• Poles switched: active only
• Tripping curve: C curve
• Breaking capacity: 6000 A
• Rated operating current: 30 mA
• Residual current type: A Type
• Rated voltage: 400/415 V AC
• Rated frequency: 50/60 Hz
• Width: 53 mm, three module
• Mounting: 35 mm DIN rail
• IP degree: IP20
• Dielectric strength: 2500 V
• Cable termination: 25 mm2
• Terminal tightening torque: 2.5 Nm
• Length of neutral lead: 900 mm

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Why it Matters

Forty amps across three actives

Each of the three active poles carries a 40 A rating at 400/415 V AC, 50/60 Hz. Overcurrent and residual current duties sit in the one enclosure, so the schedule lists a single item per protected three phase circuit. The body spans 53 mm on the rail, which is three module positions. The published range runs 10 A, 16 A, 20 A, 25 A, 32 A, 40 A and 50 A, so a board can be stepped through ratings without leaving the family or changing the per circuit footprint.

Actives break, the neutral stays

Poles switched is specified as active only. A trip opens the three phase conductors and leaves the neutral intact. Instead, a 900 mm lead leaves the factory already fitted and lands at the neutral bar. That is a generous length for a distribution board of ordinary depth. Confirm the arrangement suits the job before ordering, because it dictates how the neutral gets terminated at the board.

C curve with Type A sensing

A C characteristic suits loads that draw a surge on start up, motors and transformers and switch mode power supplies among them, letting the device ride out that surge instead of nuisance tripping. On the earth leakage side, the Type A designation covers two waveforms: residual current that is sinusoidal AC, and residual current that is pulsating DC. Electronic control gear and variable speed drives are what tend to introduce that DC component, and Type A is specified to see it. Breaking capacity sits at 6000 A, which is the fault current the unit is built to interrupt. Coordinating that figure against the prospective fault level measured at the installation is a design decision, not a catalogue one.

Termination and mounting

Conductors sized up to 25 mm2 land in the terminals, tightened to a published 2.5 Nm. Dialling a torque screwdriver to that number removes the guesswork on a circuit of this rating. Mounting is onto 35 mm DIN rail. An IP20 degree of protection puts this device behind an enclosure door rather than out in the open. Rated dielectric strength: 2500 V.

What is the rated current of the Tesla RCDM3PN40?
It is rated at 40 amps with a C curve tripping characteristic and a 6000 A breaking capacity, in a 3P+N configuration at 400/415 V AC, 50/60 Hz.

How is the neutral connected on this Tesla 3P+N RCBO?
Switching acts on the three actives only. For the neutral, a factory fitted 900 mm lead runs from the device to the neutral bar.

How much DIN rail does the Tesla RCDM3PN40 need?
It occupies 53 mm of rail width, equal to three module positions on 35 mm DIN rail. Budget three modules per device when laying out the board.

Warranty

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