Tesla RCDM1256A RCD/MCB Safety Switch RCBO 25 Amp Single Pole 6kA 30mA Type A C Curve 240V

Description

Overcurrent and earth leakage, one device.

The Tesla RCDM1256A is a single pole RCBO rated at 25 amps, combining C curve overcurrent protection with 30 mA Type A residual current sensing in one unit. It removes the need to pair a separate circuit breaker and RCD on the same final subcircuit.

Key Features

• Rated current: 25 A
• Tripping curve: C curve
• Rated breaking capacity: 6 kA
• Residual current sensitivity: 30 mA
• RCD protection class: Type A
• Poles: 1 pole
• Rated voltage: 240 V AC
• Rated frequency: 50/60 Hz
• Electromechanical endurance: 4000 operations
• Integrated filtering against transient voltages and currents
• Compliant with IEC 61009
• Backed by a 10 year warranty

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Why it Matters

One device, two protective functions

An RCBO does the work of two components. The overcurrent element interrupts sustained overloads and short circuits, while the residual current element monitors the imbalance between active and neutral and disconnects on earth leakage at 30 mA. Because both functions sit in the one device, a fault on a single circuit drops only that circuit. On a board where several final subcircuits share one upstream RCD, a single earth fault takes the lot out at once, and fault-finding then means isolating and re-energising circuit by circuit. Per-circuit RCBOs remove that problem entirely, which shortens downtime on any site where a nuisance trip is expensive.

Type A sensing for modern loads

Type A residual current protection responds to both sinusoidal AC residual currents and pulsating DC residual currents. That distinction matters as more equipment on Australian sites runs through switch-mode power supplies, variable speed drives and electronic control gear. These loads can produce residual currents carrying a DC component that an AC-only device may not detect reliably, which is why Type A has become the practical default for new work.

C curve and 6 kA in practice

The C characteristic tolerates the brief inrush that motors, transformers and switch-mode supplies draw at start-up, so the device holds in on legitimate energisation rather than nuisance tripping. The 6 kA rated breaking capacity is the prospective short-circuit current the device is built to interrupt. The RCDM1256A also carries an integrated filtering device that helps prevent unwanted operation caused by transient voltages and transient currents, which is useful on installations subject to switching surges. Coordination with the actual supply fault level at the installation remains the responsibility of the designing or installing electrician.

Where 25 A sits in the range

This RCBO belongs to a Tesla single pole 6 kA family spanning 10 A, 16 A, 20 A, 25 A, 32 A and 40 A, so a board can be populated from one consistent range. The 25 A rating suits final subcircuits sized above general-purpose outlet and lighting duty but below the larger fixed-appliance ratings. Rated for 4000 electromechanical operations, it also tolerates the routine test-button cycling that periodic verification requires over a long service life on a busy board.

Is the Tesla RCDM1256A a circuit breaker or a safety switch?
It is both. An RCBO is a combination device, so the RCDM1256A delivers 25 A C curve overcurrent protection and 30 mA residual current protection in a single unit.

What does Type A mean on this RCBO?
Type A is the residual current protection class. It means the device detects both sinusoidal AC residual currents and pulsating DC residual currents, rather than AC residual currents alone.

What standard does the Tesla RCDM1256A comply with?
The manufacturer states compliance with IEC 61009, the international standard covering residual current operated circuit breakers with integral overcurrent protection.

Warranty

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