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The Clipsal MX9R3120 is a single-pole residual current breaker with overcurrent protection (RCBO), rated 20A at 240V AC with 30mA Type A sensitivity and C-curve tripping. The MX9R3120 combines RCD and MCB functions in one slim 18mm module, designed for retrofit installations where switchboard space is at a premium.
Electrical safety is a legal requirement in every Australian home. The MX9R3120 delivers dual protection: the 20A MCB function safeguards cables from overload and short circuit damage, while the 30mA RCD function interrupts the circuit in milliseconds if an earth leakage fault occurs, protecting occupants from indirect electric shock. This combination eliminates the need for separate MCB and RCD devices, reducing installation time and freeing up valuable board space. The slim 18mm width allows retrofit work where existing boards are already densely populated.
Licensed electricians specify the MX9R3120 for retrofit jobs and new installations because the SLIM form factor fits where full-width RCBOs cannot. The MAX9 architecture supports busbar feeding via MAXBAR, cutting installation time by up to 15 times compared to traditional cable connections. Top and bottom line and load terminals allow feed-through capability, and the C-curve characteristic suits general-purpose final sub-circuits in residential and light commercial work. The 6kA breaking capacity meets AS/NZS standards for domestic installations.
The Clipsal MX9R3120 is not rated for three-phase circuits, for circuits exceeding 20A at rated voltage, or for installations in locations where the ambient temperature exceeds 70°C or drops below -25°C for extended periods.
Verified Sparky Direct customer reviews: Clipsal MX9R3120 (MX9R3120)
"Well designed and packaged, quick and seamless installation with Max9 busbar." — Phillthy Engineering
"Solid bit of kit, trusted brand, good quality never had an issue." — Ben
"Great gear." — David
(MX9R3120)
The MX9R3120 combines both functions in one slim 18mm module, saving board space and installation time. A separate MCB and RCD would require two full modules (around 36mm total) and two sets of cable connections. The MX9R3120 is certified as a single device and eliminates the complexity of coordinating two separate protective elements.
Installation must be carried out by a licensed electrician. The MX9R3120 operates on mains voltage and connects directly to the switchboard. Incorrect installation creates electrocution and fire hazards. A licensed sparky will confirm correct pole assignment, upstream protection coordination, and compliance with AS/NZS 3000.
The MX9R3120 is rated to safely break short circuits up to 6kA at 240V AC. Breaking capacity determines the maximum fault current the device can interrupt without damage or arcing. For domestic installations downstream of the main switch, 6kA is typically adequate. Your sparky will verify that the upstream main protection (MCB or main switch) is rated high enough for your actual fault level.
Yes, the Type A 30mA sensitivity makes it suitable for final sub-circuits supplying bathroom and wet-area power points. The Type A classification means the MX9R3120 responds to both AC and smooth DC earth faults, covering the hazards of wet environments. However, some installations may require RCD protection at the socket outlet itself (portable RCBO or socket outlet with integrated RCD); your sparky will confirm the design requirement.
The MX9R3120 works with both busbar (MAXBAR) and traditional cable feeding. The busbar system is optional and brings time and cost savings during installation. If you're retrofitting into an existing board, traditional cable connections remain fully compliant; the busbar advantage applies mainly to new installations or major board upgrades where the board is being reorganised.
The MX9R3120 carries a 7-year manufacturer warranty from the invoice date, covering manufacturing defects under normal use. Warranty does not cover damage from incorrect installation, electrical damage from exceeding rated parameters, or mechanical damage. Clipsal offers in-home warranty service through authorised distributors; your sparky or Sparky Direct can advise on claim procedures.
The Clipsal MX9R3120 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: 7 Year
Commercial Use: 7 Year
Warranty Method: Clipsal in home warranty
These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | Clipsal by Schneider Electric |
| SKU | MX9R3120 |
| Model # | MX9R3120 |
| Barcode # | 9311554812713 |
| Package Weight | 0.140kg |
| TYPE | VALUE |
|---|---|
| Type | Circuit Protection |
| Brand | Clipsal by Schneider Electric |
| Range | Clipsal - Max9 |
| Rated Current (A) | 20A |
| Height (mm) | 93 |
| Width (mm) | 18 |
| Depth (mm) | 73 |
| Equivalent Hager Reference | ADC920T |
| Voltage (V) | 240Vac |
| Equivalent Max 4 Reference | 4RCBE220/30S |
| Tripping | Standard |
| Poles | 1P+N |
| Curve | C-curve |
| Earth Leakage Protection Class | A-type |
| Earth Leakage Sensitivity | 30mA |
| Breaking Capacity | 6kA |
| IP Rating | IP20 |
Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.
Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.
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