Hager ADA940T 40A 1 Pole plus Neutral RCBO Safety Switch 6kA 30mA Type A C Curve 2 Module DIN Rail

Description

The Hager ADA940T is a 40A 1 Pole plus Neutral RCBO that combines overload protection, short-circuit protection and 30mA earth leakage detection in a single 2 module DIN rail device.

Built to AS/NZS 61009, this RCBO pairs a C curve miniature circuit breaker with a Type A residual current device, so one unit guards the circuit against overcurrent faults and protects people against electric shock. At 40A it is the highest current rating in Hager's 2 module ADA9 range, making it well suited to heavier residential and light commercial final subcircuits such as air conditioning, hot water, appliance banks and sub-mains feeds. The Type A residual current element responds to both AC and pulsating DC leakage currents, which matters as more loads use electronic power supplies, variable-speed drives and EV charging equipment.

• 40A rated current, C curve tripping characteristic
• 1 Pole plus Neutral configuration in a single housing
• 30mA rated residual operating current, Type A
• 6kA rated short-circuit breaking capacity (Icn) to IEC 60898-1
• Combined MCB and RCD protection in one device
• 2 module width (35mm) on 35mm DIN rail
• Rated insulation voltage Ui 500V, impulse withstand Uimp 4kV
• 230-240V rated operational voltage
• Test button for periodic RCD verification
• Screw terminals top, biconnect bypass bottom for busbar wiring
• IP2X ingress protection
• Operating temperature -25°C to +40°C

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Why choose the Hager ADA940T?

A single RCBO delivers both circuit-breaker and safety-switch functions on one pole, which frees space in the switchboard and lets you protect individual circuits independently. Because each circuit has its own RCBO, an earth leakage fault on one circuit does not trip an entire group of circuits sharing a single upstream RCD. The 40A rating and C curve suit circuits with moderate inrush, while the 6kA breaking capacity is appropriate for typical domestic and light commercial supply arrangements.

What is a Type A RCBO?

A Type A residual current device detects sinusoidal AC earth leakage as well as pulsating DC leakage that can be produced by equipment with rectifiers and electronic controls. This is broader coverage than a basic Type AC device and is increasingly specified for modern installations. The ADA940T trips on residual currents at its rated 30mA sensitivity, the level associated with personal protection against electric shock.

Installation and wiring

The ADA940T mounts on standard 35mm DIN rail and occupies 2 modules (35mm) of board width. Line and load connect through screw terminals rated for 1-25mm² rigid or 1-16mm² flexible conductors at a nominal tightening torque of 2.1Nm. The biconnect bypass bottom connection accepts pin-type busbar, making it straightforward to comb multiple devices in a distribution board. All work must be carried out by a licensed electrician in accordance with AS/NZS 3000.

Frequently asked questions

Does the Hager ADA940T protect against both overload and earth leakage?
Yes. It is a combined RCBO, so a single device provides C curve overload and short-circuit protection plus 30mA Type A residual current (earth leakage) protection.

How much space does the ADA940T take on the DIN rail?
It is a 2 module device, 35mm wide, mounting on standard 35mm DIN rail.

What is the current rating in Australian conditions?
The ADA940T is rated 40A at 30°C ambient. Hager's data shows the device carries approximately 40.6A at 25°C, 40A at 30°C and 38.8A at 40°C, so allow for derating in warmer switchboard environments.