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Learn more by watching our Hager CDA440T | 4 Pole 40A RCD 6ka 30ma video.
The Hager CDA440T is a four-pole residual current device (RCD) rated at 40 amps with a 6kA breaking capacity and 30mA sensitivity, designed to protect circuits against earth leakage in accordance with AS/NZS 61008-1. The CDA440T is a Type A RCD suited to residential and light commercial installations. Both line and load terminals are non-sensitive, so the CDA440T can replace alternative brands without requiring circuit rewiring.
Safety switches have become essential on new installations and upgrades under current Australian wiring rules. A 40A four-pole RCD like the CDA440T protects the entire switchboard or a substantial sub-circuit from earth leakage faults. Many electricians value Hager RCDs for their solid build quality and consistent operation on the job, where reliability translates to fewer call-backs and repeat site visits.
The CDA440T fits standard DIN rail mounting and is compact at 83mm high, 70mm wide, and 70mm deep, making it ideal for retrofit work in tight switchboard enclosures. Electricians routinely stock Hager units for site flexibility and quick swaps when replacing older or failed safety switches. The four-pole configuration covers mains protection on both phases plus neutral and earth, so no additional link switches or accessories are needed for basic installation.
The Hager CDA440T is not suitable for sub-board circuits with sensitive measuring instruments or computer systems that may generate harmless DC leakage currents. In those cases, a Type B RCCB or selective time-delay device is recommended to prevent nuisance tripping. Do not use the CDA440T in AC-only circuits without verifying that any variable-frequency drives or power factor correction banks are compatible with Type A operation, as some specialist loads require Type B or Type A/F protection.
Verified Sparky Direct customer reviews: Hager CDA440T | 4 Pole 40A RCD 6ka 30ma (CDA440T)
"Great product and well priced." — Chris Butson
"Well priced RCD, sems to work fine" — Peter
"Fast, friendly and efficient. I couldn't ask for more." — Matt
(CDA440T)
The CDA440T detects both AC and transient DC earth leakage currents. This makes it suitable for circuits with variable-load devices (fridges, dishwashers, power tools, air conditioners) that produce harmless transient leakage. Type A is the standard for domestic installation under AS/NZS 61008-1 unless specialist equipment requires Type B protection.
Yes. The CDA440T has non-sensitive line and load terminals, so you can connect it directly without rewiring. It works as a drop-in replacement for competing four-pole RCDs from Schneider, ABB, or Clipsal, which is why electricians choose Hager units for retrofits.
The CDA440T is commonly used for entire-house mains protection, protecting all circuits from meter to main board. The 40A rating suits most domestic installations. If your home draws higher peak current (e.g., dual air-conditioning), you may need a larger main switch upstream instead.
The CDA440T can safely interrupt earth faults up to 6,000 amps. This covers most domestic and light commercial installations. For high-fault-level industrial sites, a higher-rated device may be necessary; your electrical audit will confirm the required breaking capacity.
Press the manual test button monthly. The RCD should trip immediately, cutting power. If it doesn't trip, stop using the circuit and call an electrician. If it trips too easily on normal loads, there may be a leakage fault on that circuit requiring investigation.
The CDA440T detects earth leakage as small as 30 milliamps, the standard for domestic RCDs. This threshold trips fast enough to prevent serious injury if you touch a live conductor, but not so fast that it triggers on normal device leakage.
The CDA440T is suitable for AC-coupled solar and most battery systems. For hybrid or DC-coupled setups, consult your solar installer about whether a Type A, Type B, or hybrid RCD is required. Some systems need additional DC protection.
The CDA440T carries a 2-year warranty from Hager, starting from your invoice date. Return it to Sparky Direct with proof of purchase if it fails. Hager will replace it if the fault is manufacturing-related. The warranty is void if installed by an unqualified electrician or if it shows physical damage or misuse.
The Hager CDA440T is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.
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Warranty starts from Invoice Date
Domestic Use: 2 Year
Commercial Use: 2 Year
Warranty Method: Return to Sparky Direct
These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | Hager Electrical |
| SKU | CDA440T |
| Model # | CDA440T |
| Barcode # | 3250611615507 |
| Package Weight | 0.340kg |
| TYPE | VALUE |
|---|---|
| Type | Circuit Protection |
| Brand | Hager Electrical |
| Rated Current (A) | 40 |
| Height (mm) | 83 |
| Width (mm) | 70 |
| Depth (mm) | 70 |
| Standards | AS/NZS 61008-1 |
| Mounting | DIN Rail |
| Number of Poles | 4 |
| IP Rating | IP20 ( IP40 Enclosed ) |
| Breaking Capacity | 6kA |
| Neutral Position | Right |
| Earth Leakage Sensitivity | 30mA |
| Earth Leakage Protection Class | Type A |
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