The Type I Plug: Australia, China, and Argentina's Angled-Pin Design

The Type I plug is the V-shaped angled-pin design used across Oceania, parts of China and Argentina, and a handful of Pacific Islands. It's one of the more distinctive plug shapes in the world, instantly recognizable from across a room. This guide covers the design, the regional variants, and what to know for travel between Type I countries.

What Type I is

The Type I plug has three pins:

• Two flat pins angled at 30 degrees from vertical, forming a V shape, for live and neutral
• One vertical earth pin below the V
• Pin dimensions are approximately 6.5 mm wide, 1.6 mm thick

The socket has matching slots. Modern Australian sockets have an integrated switch beside each outlet that physically interrupts power.

The standard is defined under AS/NZS 3112 (the joint Australia-New Zealand standard). The same basic design with minor variations is used in China (GB 1002), Argentina (IRAM 2073), and several Pacific Islands.

The 1937 origin

Australia adopted the Type I design under Standards Australia in 1937. The choice was driven by:

• A desire for a distinctly Australian standard rather than adopting British Type G or American Type A
• Mechanical simplicity (angled pins are easy to manufacture)
• Clear visual distinction from other plug types
• The angled-pin layout naturally polarizes the plug (you can't insert it backwards)

The design has been essentially unchanged for 90 years. The only major addition was the standardization of switched outlets, which became universal across Australia and New Zealand by the 1970s.

The regional variants

Australian Type I (AS/NZS 3112)

The "reference" Type I:

• Pins angled exactly 30 degrees from vertical
• Pin width 6.5 mm, thickness 1.6 mm
• Switched wall outlets are standard

Used in: Australia, New Zealand, Fiji, Samoa, Cook Islands, Papua New Guinea, Solomon Islands, Vanuatu, Tonga, Kiribati, Tuvalu, Nauru, Niue.

Chinese Type I (GB 1002)

Slightly different from the Australian:

• Pin angle is slightly more vertical (about 28 degrees from vertical instead of 30)
• Pins are slightly thicker
• Pin spacing is the same as Australian

Used in: Mainland China primarily. Hong Kong, Macau, and Taiwan use different standards.

Argentine Type I (IRAM 2073)

Visually identical to Australian Type I:

• Same 30-degree pin angle
• Same pin dimensions
• Same earth pin position
• But polarity is sometimes reversed compared to Australia (live and neutral swapped)

Used in: Argentina, Uruguay (some buildings).

Cross-compatibility between variants

The pin geometry differences mean Type I variants are not perfectly interchangeable:

• Australian plug in Chinese socket: usually fits, sometimes loose due to angle difference
• Australian plug in Argentine socket: fits identically, but polarity may be reversed
• Chinese plug in Australian socket: may not seat fully due to angle difference and pin thickness
• Argentine plug in Australian socket: fits identically, but polarity may be reversed

For travel between these countries, an adapter is sometimes useful as a safety net. Direct fit usually works but isn't guaranteed.

Type I vs other plug types

Type I shares more with Type G than Schuko in terms of safety convention (switched outlets, polarization) but doesn't include the in-plug fuse that's Type G's signature feature.

Where Type I is dominant

Type I is the consumer mains standard in:

• Australia
• New Zealand
• Fiji
• Samoa
• Tonga
• Cook Islands
• Solomon Islands
• Vanuatu
• Papua New Guinea
• Kiribati, Tuvalu, Nauru, Niue
• Argentina (with possible polarity differences)
• Uruguay (some buildings)
• China (with slight pin angle variation)

By population, China is the biggest Type I user. By geographic spread, Australia and the Pacific dominate.

The switched-outlet convention

Almost universally in Type I countries, every wall socket has a small rocker switch beside it that physically interrupts power. Plug in the device, then flip the switch. If a plugged-in device isn't charging, the switch is the first thing to check.

The convention dates to Australian safety preference: switching the outlet allows users to disconnect power without unplugging the device, useful for high-draw appliances and reducing wear on the plug-socket interface.

Travelers from non-switched-outlet countries (US, continental Europe, much of Asia) often forget the switch and assume their charger is broken when the device isn't charging. The switch is the first thing to check.

Practical implications for travelers

If you're traveling between Type I countries:

• Australia to New Zealand or Fiji: no adapter needed, identical plugs
• Australia to China: an adapter is useful as a safety net for the angle difference
• Australia to Argentina: works directly but polarity may be reversed
• China to Australia: an adapter is recommended for reliable fit

If you're traveling to a Type I country from elsewhere:

• The angled-pin V shape is so distinctive that universal adapters from major brands always include explicit Type I support
• Look for "Australia" or "Type I" in the adapter spec sheet
• Avoid universal adapters that don't list Type I (some cheap ones skip it)

For grounded high-draw appliances, the dedicated earth pin works the same way as other plug designs. For non-grounded devices, a two-pin Type I adapter that omits the earth pin is sometimes used.

The bottom line

Type I is one of the more distinctive plug designs in mainstream use today. The V-shaped angled-pin layout has been Australia's standard since 1937 and has spread across the Pacific, parts of South America, and China.

The regional variants are similar but not identical. Australian and New Zealand Type I are interchangeable. Chinese Type I is slightly different and may not seat reliably in Australian sockets. Argentine Type I is geometrically identical to Australian but may have reversed polarity.

For travelers to Type I countries: ensure your universal adapter explicitly covers Type I. Remember the wall switch convention. Voltage is 220-240 V across all Type I countries.