Tesla RCDM3PN20 RCD/MCB Safety Switch RCBO 20 Amp 3P+N 6kA 30mA Type A C Curve 3 Module 53mm

Description

Twenty amps of three phase protection, three modules wide.

The Tesla RCDM3PN20 is a 3P+N RCBO rated at 20 amps. It carries C curve overcurrent protection and 30 mA Type A residual current sensing in a single 53 mm body, so one device covers both duties on a three phase final subcircuit. A 900 mm neutral lead is fitted from the factory.

Key Features

• Rated current: 20 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

One device, two jobs

An RCBO folds the residual current device and the miniature circuit breaker into one unit. On this model that means 20 A of overcurrent protection and 30 mA of earth leakage protection are handled together, and a fault on the circuit isolates at a single point. For the person reading the board later, the protection for each three phase subcircuit sits in one identifiable device rather than being split across a shared RCD and a separate breaker.

Where the neutral goes

Only the three active poles are switched on this device. The neutral is not switched. In its place the unit ships with a 900 mm neutral lead that runs back to the neutral bar. Allow for terminating that lead when you set out the board, since the neutral connection is landed at the bar rather than on the device.

Choosing a C curve at 20 A

The C characteristic is shaped to ride through the short inrush that motors, transformers and switch-mode power supplies pull on start-up. At 20 A that suits three phase circuits feeding plant which draws a brief surge before settling to a steady load. Type A residual current sensing detects sinusoidal AC residual current and pulsating DC residual current, which is the relevant category once electronic control gear or variable speed drives sit downstream. A breaking capacity of 6000 A states how much prospective fault current this RCBO is rated to interrupt, and checking that rating against the fault level available at the board stays with the designing or installing electrician.

Fitting it to the board

Mounting is to standard 35 mm DIN rail and the enclosure carries an IP20 degree of protection, which places it inside a switchboard rather than in the open. Terminals take conductors to 25 mm2 at a specified tightening torque of 2.5 Nm, so a torque screwdriver produces a consistent result across every pole. Dielectric strength is 2500 V. Ratings from 10 A to 50 A share this body, letting a full three phase board schedule be drawn from a single consistent range.

What does the Tesla RCDM3PN20 protect against?
It provides both 20 A C curve overcurrent protection and 30 mA Type A residual current protection on a 3P+N circuit, in one device rated at 6000 A breaking capacity.

Is the neutral switched on this Tesla 3P+N RCBO?
No. The three active poles are switched and the neutral is not. A 900 mm neutral lead is supplied for connection back to the neutral bar.

What DIN rail does the Tesla RCDM3PN20 mount to?
It clips to standard 35 mm DIN rail, occupies three modules at 53 mm wide, and is rated IP20 for mounting inside an enclosed switchboard.

Warranty

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